app/models/geographic_item.rb
require 'rgeo'
# A GeographicItem is one and only one of [point, line_string, polygon, multi_point, multi_line_string,
# multi_polygon, geometry_collection] which describes a position, path, or area on the globe, generally associated
# with a geographic_area (through a geographic_area_geographic_item entry), and sometimes only with a georeference.
#
# @!attribute point
# @return [RGeo::Geographic::ProjectedPointImpl]
#
# @!attribute line_string
# @return [RGeo::Geographic::ProjectedLineStringImpl]
#
# @!attribute polygon
# @return [RGeo::Geographic::ProjectedPolygonImpl]
#
# @!attribute multi_point
# @return [RGeo::Geographic::ProjectedMultiPointImpl]
#
# @!attribute multi_line_string
# @return [RGeo::Geographic::ProjectedMultiLineStringImpl]
#
# @!attribute multi_polygon
# @return [RGeo::Geographic::ProjectedMultiPolygonImpl]
#
# @!attribute type
# @return [String]
# Rails STI, determines the geography column as well
#
class GeographicItem < ApplicationRecord
include Housekeeping::Users
include Housekeeping::Timestamps
include Shared::IsData
include Shared::SharedAcrossProjects
# an internal variable for use in super calls, holds a geo_json hash (temporarily)
attr_accessor :geometry
attr_accessor :shape
DATA_TYPES = [:point,
:line_string,
:polygon,
:multi_point,
:multi_line_string,
:multi_polygon,
:geometry_collection].freeze
GEOMETRY_SQL = Arel::Nodes::Case.new(arel_table[:type])
.when('GeographicItem::MultiPolygon').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:multi_polygon].as('geometry')]))
.when('GeographicItem::Point').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:point].as('geometry')]))
.when('GeographicItem::LineString').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:line_string].as('geometry')]))
.when('GeographicItem::Polygon').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:polygon].as('geometry')]))
.when('GeographicItem::MultiLineString').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:multi_line_string].as('geometry')]))
.when('GeographicItem::MultiPoint').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:multi_point].as('geometry')]))
.when('GeographicItem::GeometryCollection').then(Arel::Nodes::NamedFunction.new("CAST", [arel_table[:geometry_collection].as('geometry')]))
.freeze
# "CASE geographic_items.type
# WHEN 'GeographicItem::MultiPolygon' THEN multi_polygon::geometry
# WHEN 'GeographicItem::Point' THEN point::geometry
# WHEN 'GeographicItem::LineString' THEN line_string::geometry
# WHEN 'GeographicItem::Polygon' THEN polygon::geometry
# WHEN 'GeographicItem::MultiLineString' THEN multi_line_string::geometry
# WHEN 'GeographicItem::MultiPoint' THEN multi_point::geometry
# WHEN 'GeographicItem::GeometryCollection' THEN geometry_collection::geometry
# END".freeze
GEOGRAPHY_SQL = "CASE geographic_items.type
WHEN 'GeographicItem::MultiPolygon' THEN multi_polygon
WHEN 'GeographicItem::Point' THEN point
WHEN 'GeographicItem::LineString' THEN line_string
WHEN 'GeographicItem::Polygon' THEN polygon
WHEN 'GeographicItem::MultiLineString' THEN multi_line_string
WHEN 'GeographicItem::MultiPoint' THEN multi_point
WHEN 'GeographicItem::GeometryCollection' THEN geometry_collection
END".freeze
# ANTI_MERIDIAN = '0X0102000020E61000000200000000000000008066400000000000405640000000000080664000000000004056C0'
ANTI_MERIDIAN = 'LINESTRING (180 89.0, 180 -89)'.freeze
has_many :geographic_areas_geographic_items, dependent: :destroy, inverse_of: :geographic_item
has_many :geographic_areas, through: :geographic_areas_geographic_items
has_many :geographic_area_types, through: :geographic_areas
has_many :parent_geographic_areas, through: :geographic_areas, source: :parent
has_many :gadm_geographic_areas, class_name: 'GeographicArea', foreign_key: :gadm_geo_item_id
has_many :ne_geographic_areas, class_name: 'GeographicArea', foreign_key: :ne_geo_item_id
has_many :tdwg_geographic_areas, class_name: 'GeographicArea', foreign_key: :tdwg_geo_item_id
has_many :georeferences
has_many :georeferences_through_error_geographic_item,
class_name: 'Georeference', foreign_key: :error_geographic_item_id
has_many :collecting_events_through_georeferences, through: :georeferences, source: :collecting_event
has_many :collecting_events_through_georeference_error_geographic_item,
through: :georeferences_through_error_geographic_item, source: :collecting_event
before_validation :set_type_if_geography_present
validate :some_data_is_provided
validates :type, presence: true
scope :include_collecting_event, -> { includes(:collecting_events_through_georeferences) }
scope :geo_with_collecting_event, -> { joins(:collecting_events_through_georeferences) }
scope :err_with_collecting_event, -> { joins(:georeferences_through_error_geographic_item) }
class << self
# @return [GeographicItem::ActiveRecord_Relation]
# @params [Array] array of geographic area ids
def default_by_geographic_area_ids(geographic_area_ids = [])
GeographicItem.
joins(:geographic_areas_geographic_items).
merge(::GeographicAreasGeographicItem.default_geographic_item_data).
where(geographic_areas_geographic_items: {geographic_area_id: geographic_area_ids})
end
# @param [String] wkt
# @return [Boolean]
# whether or not the wtk intersects with the anti-meridian
# !! StrongParams security considerations
def crosses_anti_meridian?(wkt)
GeographicItem.find_by_sql(
['SELECT ST_Intersects(ST_GeogFromText(?), ST_GeogFromText(?)) as r;', wkt, ANTI_MERIDIAN]
).first.r
end
# @param [Integer] ids
# @return [Boolean]
# whether or not any GeographicItem passed intersects the anti-meridian
# !! StrongParams security considerations
# This is our first line of defense against queries that define multiple shapes, one or
# more of which crosses the anti-meridian. In this case the current TW strategy within the
# UI is to abandon the search, and prompt the user to refactor the query.
def crosses_anti_meridian_by_id?(*ids)
q1 = ["SELECT ST_Intersects((SELECT single_geometry FROM (#{GeographicItem.single_geometry_sql(*ids)}) as " \
'left_intersect), ST_GeogFromText(?)) as r;', ANTI_MERIDIAN]
_q2 = ActiveRecord::Base.send(:sanitize_sql_array, ['SELECT ST_Intersects((SELECT single_geometry FROM (?) as ' \
'left_intersect), ST_GeogFromText(?)) as r;', GeographicItem.single_geometry_sql(*ids), ANTI_MERIDIAN])
GeographicItem.find_by_sql(q1).first.r
end
# TODO: * rename to reflect either/or and what is being returned
# @param [Integer] geographic_area_ids
# @param [String] shape_in in JSON (POINT, POLYGON, MULTIPOLYGON), usually from GoogleMaps
# @param [String] search_object_class
# @param [Integer] project_id for search_object_class
# @return [Scope] of the requested search_object_type
def gather_geographic_area_or_shape_data(geographic_area_ids, shape_in, search_object_class, project_id)
if shape_in.blank?
# get the shape from the geographic area, if possible
finding = search_object_class.constantize
target_geographic_item_ids = []
if geographic_area_ids.blank?
found = finding.none
else
# now use method from collection_object_filter_query
geographic_area_ids.each do |gaid|
target_geographic_item_ids.push(GeographicArea.joins(:geographic_items)
.find(gaid)
.default_geographic_item.id)
end
# TODO: There probably is a better way to do this, but for now...
f1 = project_id.present? ? finding.with_project_id(project_id) : finding
case search_object_class
when /Collection/, /Collecting/
found = f1.joins(:geographic_items)
.where(GeographicItem.contained_by_where_sql(target_geographic_item_ids))
when /Asserted/
# TODO: Figure out how to see through this group of geographic_items to the ones which contain
# geographic_items which are associated with geographic_areas (as #default_geographic_items)
# which are associated with asserted_distributions
found = f1.joins(:geographic_area).joins(:geographic_items)
.where(GeographicItem.contained_by_where_sql(target_geographic_item_ids))
else
end
end
else
found = gather_map_data(shape_in, search_object_class, project_id)
end
found
end
# @param [String] feature in JSON, looks like '{"type":"Feature","geometry":{"type":"Polygon",
# "coordinates":[[[-40.078125,10.614539227964332],[-49.21875,-17.185577279306226],
# [-23.203125,-15.837353550148276],[-40.078125,10.614539227964332]]]},"properties":{}}'
# @param [String] search_object_class
# @param [Integer, Nil] project_id for search_object_class
# @return [Scope] of the requested search_object_type
# This function takes a feature, i.e. a string that is the result
# of drawing on a Google map, and submited as a form variable,
# and translates that to a scope for a provided search_object_class.
# e.g. Return all CollectionObjects in this drawn area
# Return all CollectionObjects in the radius around this point
def gather_map_data(feature, search_object_class, project_id)
finding = search_object_class.constantize
g_feature = RGeo::GeoJSON.decode(feature, json_parser: :json)
if g_feature.nil?
finding.none
else
geometry = g_feature.geometry # isolate the WKT
shape_type = geometry.geometry_type.to_s.downcase
geometry = geometry.as_text
radius = g_feature['radius']
query = project_id.present? ?
finding.with_project_id(project_id).joins(:geographic_items) :
finding.joins(:geographic_items)
case shape_type
when 'point'
query.where(GeographicItem.within_radius_of_wkt_sql(geometry, radius))
when 'polygon', 'multipolygon'
query.where(GeographicItem.contained_by_wkt_sql(geometry))
else
query
end
end
end
#
# SQL fragments
#
# @param [Integer, String]
# @return [String]
# a SQL select statement that returns the *geometry* for the geographic_item with the specified id
def select_geometry_sql(geographic_item_id)
"SELECT #{GeographicItem::GEOMETRY_SQL.to_sql} from geographic_items where geographic_items.id = #{geographic_item_id}"
end
# @param [Integer, String]
# @return [String]
# a SQL select statement that returns the geography for the geographic_item with the specified id
def select_geography_sql(geographic_item_id)
ActiveRecord::Base.send(:sanitize_sql_for_conditions, [
"SELECT #{GeographicItem::GEOMETRY_SQL.to_sql} from geographic_items where geographic_items.id = ?",
geographic_item_id])
end
# @param [Symbol] choice
# @return [String]
# a fragment returning either latitude or longitude columns
def lat_long_sql(choice)
return nil unless [:latitude, :longitude].include?(choice)
f = "'D.DDDDDD'" # TODO: probably a constant somewhere
v = (choice == :latitude ? 1 : 2)
"CASE type
WHEN 'GeographicItem::GeometryCollection' THEN split_part(ST_AsLatLonText(ST_Centroid" \
"(geometry_collection::geometry), #{f}), ' ', #{v})
WHEN 'GeographicItem::LineString' THEN split_part(ST_AsLatLonText(ST_Centroid(line_string::geometry), " \
"#{f}), ' ', #{v})
WHEN 'GeographicItem::MultiPolygon' THEN split_part(ST_AsLatLonText(" \
"ST_Centroid(multi_polygon::geometry), #{f}), ' ', #{v})
WHEN 'GeographicItem::Point' THEN split_part(ST_AsLatLonText(" \
"ST_Centroid(point::geometry), #{f}), ' ', #{v})
WHEN 'GeographicItem::Polygon' THEN split_part(ST_AsLatLonText(" \
"ST_Centroid(polygon::geometry), #{f}), ' ', #{v})
WHEN 'GeographicItem::MultiLineString' THEN split_part(ST_AsLatLonText(" \
"ST_Centroid(multi_line_string::geometry), #{f} ), ' ', #{v})
WHEN 'GeographicItem::MultiPoint' THEN split_part(ST_AsLatLonText(" \
"ST_Centroid(multi_point::geometry), #{f}), ' ', #{v})
END as #{choice}"
end
# @param [Integer] geographic_item_id
# @param [Integer] distance
# @return [String]
def within_radius_of_item_sql(geographic_item_id, distance)
"ST_DWithin((#{GeographicItem::GEOGRAPHY_SQL}), (#{select_geography_sql(geographic_item_id)}), #{distance})"
end
# @param [String] wkt
# @param [Integer] distance
# @return [String]
def within_radius_of_wkt_sql(wkt, distance)
"ST_DWithin((#{GeographicItem::GEOGRAPHY_SQL}), ST_Transform( ST_GeomFromText('#{wkt}', " \
"4326), 4326), #{distance})"
end
# @param [String, Integer, String]
# @return [String]
# a SQL fragment for ST_Contains() function, returns
# all geographic items which are contained in the item supplied
def containing_sql(target_column_name = nil, geographic_item_id = nil, source_column_name = nil)
return 'false' if geographic_item_id.nil? || source_column_name.nil? || target_column_name.nil?
"ST_Contains(#{target_column_name}::geometry, (#{geometry_sql(geographic_item_id, source_column_name)}))"
end
# @param [String, Integer, String]
# @return [String]
# a SQL fragment for ST_Contains(), returns
# all geographic_items which contain the supplied geographic_item
def reverse_containing_sql(target_column_name = nil, geographic_item_id = nil, source_column_name = nil)
return 'false' if geographic_item_id.nil? || source_column_name.nil? || target_column_name.nil?
"ST_Contains((#{geometry_sql(geographic_item_id, source_column_name)}), #{target_column_name}::geometry)"
end
# @param [Integer, String]
# @return [String]
# a SQL fragment that represents the geometry of the geographic item specified (which has data in the
# source_column_name, i.e. geo_object_type)
def geometry_sql(geographic_item_id = nil, source_column_name = nil)
return 'false' if geographic_item_id.nil? || source_column_name.nil?
"select geom_alias_tbl.#{source_column_name}::geometry from geographic_items geom_alias_tbl " \
"where geom_alias_tbl.id = #{geographic_item_id}"
end
# rubocop:disable Metrics/MethodLength
# @param [String] column_name
# @param [GeographicItem] geographic_item
# @return [String] of SQL
def is_contained_by_sql(column_name, geographic_item)
geo_id = geographic_item.id
geo_type = geographic_item.geo_object_type
template = '(ST_Contains((select geographic_items.%s::geometry from geographic_items where ' \
'geographic_items.id = %d), %s::geometry))'
retval = []
column_name.downcase!
case column_name
when 'any'
DATA_TYPES.each { |column|
unless column == :geometry_collection
retval.push(template % [geo_type, geo_id, column])
end
}
when 'any_poly', 'any_line'
DATA_TYPES.each { |column|
unless column == :geometry_collection
if column.to_s.index(column_name.gsub('any_', ''))
retval.push(template % [geo_type, geo_id, column])
end
end
}
else
retval = template % [geo_type, geo_id, column_name]
end
retval = retval.join(' OR ') if retval.instance_of?(Array)
retval
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String]
# a select query that returns a single geometry (column name 'single_geometry' for the collection of ids
# provided via ST_Collect)
def st_collect_sql(*geographic_item_ids)
geographic_item_ids.flatten!
ActiveRecord::Base.send(:sanitize_sql_for_conditions, [
"SELECT ST_Collect(f.the_geom) AS single_geometry
FROM (
SELECT (ST_DUMP(#{GeographicItem::GEOMETRY_SQL.to_sql})).geom as the_geom
FROM geographic_items
WHERE id in (?))
AS f", geographic_item_ids])
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String]
# returns one or more geographic items combined as a single geometry in column 'single'
def single_geometry_sql(*geographic_item_ids)
a = GeographicItem.st_collect_sql(geographic_item_ids)
'(SELECT single.single_geometry FROM (' + a + ' ) AS single)'
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String]
# returns a single geometry "column" (paren wrapped) as "single" for multiple geographic item ids, or the
# geometry as 'geometry' for a single id
def geometry_sql2(*geographic_item_ids)
geographic_item_ids.flatten! # *ALWAYS* reduce the pile to a single level of ids
if geographic_item_ids.count == 1
"(#{GeographicItem.geometry_for_sql(geographic_item_ids.first)})"
else
GeographicItem.single_geometry_sql(geographic_item_ids)
end
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String]
def containing_where_sql(*geographic_item_ids)
"ST_CoveredBy(
#{GeographicItem.geometry_sql2(*geographic_item_ids)},
CASE geographic_items.type
WHEN 'GeographicItem::MultiPolygon' THEN multi_polygon::geometry
WHEN 'GeographicItem::Point' THEN point::geometry
WHEN 'GeographicItem::LineString' THEN line_string::geometry
WHEN 'GeographicItem::Polygon' THEN polygon::geometry
WHEN 'GeographicItem::MultiLineString' THEN multi_line_string::geometry
WHEN 'GeographicItem::MultiPoint' THEN multi_point::geometry
END)"
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String]
def containing_where_sql_geog(*geographic_item_ids)
"ST_CoveredBy(
#{GeographicItem.geometry_sql2(*geographic_item_ids)},
CASE geographic_items.type
WHEN 'GeographicItem::MultiPolygon' THEN multi_polygon::geography
WHEN 'GeographicItem::Point' THEN point::geography
WHEN 'GeographicItem::LineString' THEN line_string::geography
WHEN 'GeographicItem::Polygon' THEN polygon::geography
WHEN 'GeographicItem::MultiLineString' THEN multi_line_string::geography
WHEN 'GeographicItem::MultiPoint' THEN multi_point::geography
END)"
end
# @param [Interger, Array of Integer] ids
# @return [Array]
# If we detect that some query id has crossed the meridian, then loop through
# and "manually" build up a list of results.
# Should only be used if GeographicItem.crosses_anti_meridian_by_id? is true.
# Note that this does not return a Scope, so you can't chain it like contained_by?
# TODO: test this
def contained_by_with_antimeridian_check(*ids)
ids.flatten! # make sure there is only one level of splat (*)
results = []
crossing_ids = []
ids.each do |id|
# push each which crosses
crossing_ids.push(id) if GeographicItem.crosses_anti_meridian_by_id?(id)
end
non_crossing_ids = ids - crossing_ids
results.push GeographicItem.contained_by(non_crossing_ids).to_a if non_crossing_ids.any?
crossing_ids.each do |id|
# [61666, 61661, 61659, 61654, 61639]
q1 = ActiveRecord::Base.send(:sanitize_sql_array, ['SELECT ST_AsText((SELECT polygon FROM geographic_items ' \
'WHERE id = ?))', id])
r = GeographicItem.where(
# GeographicItem.contained_by_wkt_shifted_sql(GeographicItem.find(id).geo_object.to_s)
GeographicItem.contained_by_wkt_shifted_sql(
ApplicationRecord.connection.execute(q1).first['st_astext'])
).to_a
results.push(r)
end
results.flatten.uniq
end
# @params [String] well known text
# @return [String] the SQL fragment for the specific geometry type, shifted by longitude
# Note: this routine is called when it is already known that the A argument crosses anti-meridian
def contained_by_wkt_shifted_sql(wkt)
"ST_Contains(ST_ShiftLongitude(ST_GeomFromText('#{wkt}', 4326)), (
CASE geographic_items.type
WHEN 'GeographicItem::MultiPolygon' THEN ST_ShiftLongitude(multi_polygon::geometry)
WHEN 'GeographicItem::Point' THEN ST_ShiftLongitude(point::geometry)
WHEN 'GeographicItem::LineString' THEN ST_ShiftLongitude(line_string::geometry)
WHEN 'GeographicItem::Polygon' THEN ST_ShiftLongitude(polygon::geometry)
WHEN 'GeographicItem::MultiLineString' THEN ST_ShiftLongitude(multi_line_string::geometry)
WHEN 'GeographicItem::MultiPoint' THEN ST_ShiftLongitude(multi_point::geometry)
END
)
)"
end
# TODO: Remove the hard coded 4326 reference
# @params [String] wkt
# @return [String] SQL fragment limiting geographics items to those in this WKT
def contained_by_wkt_sql(wkt)
if crosses_anti_meridian?(wkt)
retval = contained_by_wkt_shifted_sql(wkt)
else
retval = "ST_Contains(ST_GeomFromText('#{wkt}', 4326), (
CASE geographic_items.type
WHEN 'GeographicItem::MultiPolygon' THEN multi_polygon::geometry
WHEN 'GeographicItem::Point' THEN point::geometry
WHEN 'GeographicItem::LineString' THEN line_string::geometry
WHEN 'GeographicItem::Polygon' THEN polygon::geometry
WHEN 'GeographicItem::MultiLineString' THEN multi_line_string::geometry
WHEN 'GeographicItem::MultiPoint' THEN multi_point::geometry
END
)
)"
end
retval
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String] sql for contained_by via ST_ContainsProperly
# Note: Can not use GEOMETRY_SQL because geometry_collection is not supported in ST_ContainsProperly
# Note: !! If the target GeographicItem#id crosses the anti-meridian then you may/will get unexpected results.
def contained_by_where_sql(*geographic_item_ids)
"ST_Contains(
#{GeographicItem.geometry_sql2(*geographic_item_ids)},
CASE geographic_items.type
WHEN 'GeographicItem::MultiPolygon' THEN multi_polygon::geometry
WHEN 'GeographicItem::Point' THEN point::geometry
WHEN 'GeographicItem::LineString' THEN line_string::geometry
WHEN 'GeographicItem::Polygon' THEN polygon::geometry
WHEN 'GeographicItem::MultiLineString' THEN multi_line_string::geometry
WHEN 'GeographicItem::MultiPoint' THEN multi_point::geometry
END)"
end
# @param [RGeo:Point] rgeo_point
# @return [String] sql for containing via ST_CoveredBy
# TODO: Remove the hard coded 4326 reference
# TODO: should this be wkt_point instead of rgeo_point?
def containing_where_for_point_sql(rgeo_point)
"ST_CoveredBy(
ST_GeomFromText('#{rgeo_point}', 4326),
#{GeographicItem::GEOMETRY_SQL.to_sql}
)"
end
# @param [Interger] geographic_item_id
# @return [String] SQL for geometries
# example, not used
def geometry_for_sql(geographic_item_id)
'SELECT ' + GeographicItem::GEOMETRY_SQL.to_sql + ' AS geometry FROM geographic_items WHERE id = ' \
"#{geographic_item_id} LIMIT 1"
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [String] SQL for geometries
# example, not used
def geometry_for_collection_sql(*geographic_item_ids)
'SELECT ' + GeographicItem::GEOMETRY_SQL.to_sql + ' AS geometry FROM geographic_items WHERE id IN ' \
"( #{geographic_item_ids.join(',')} )"
end
#
# Scopes
#
# @param [Interger, Array of Integer] geographic_item_ids
# @return [Scope]
# the geographic items containing these collective geographic_item ids, not including self
def containing(*geographic_item_ids)
where(GeographicItem.containing_where_sql(geographic_item_ids)).not_ids(*geographic_item_ids)
end
# @param [Interger, Array of Integer] geographic_item_ids
# @return [Scope]
# the geographic items contained by any of these geographic_item ids, not including self
# (works via ST_ContainsProperly)
def contained_by(*geographic_item_ids)
where(GeographicItem.contained_by_where_sql(geographic_item_ids))
end
# @param [RGeo::Point] rgeo_point
# @return [Scope]
# the geographic items containing this point
# TODO: should be containing_wkt ?
def containing_point(rgeo_point)
where(GeographicItem.containing_where_for_point_sql(rgeo_point))
end
# @param [String] 'ASC' or 'DESC'
# @return [Scope]
def ordered_by_area(direction = 'ASC')
order("ST_Area(#{GeographicItem::GEOMETRY_SQL.to_sql}) #{direction}")
end
# @return [Scope]
# adds an area_in_meters field, with meters
def with_area
select("ST_Area(#{GeographicItem::GEOGRAPHY_SQL}, false) as area_in_meters")
end
# return [Scope]
# A scope that limits the result to those GeographicItems that have a collecting event
# through either the geographic_item or the error_geographic_item
#
# A raw SQL join approach for comparison
#
# GeographicItem.joins('LEFT JOIN georeferences g1 ON geographic_items.id = g1.geographic_item_id').
# joins('LEFT JOIN georeferences g2 ON geographic_items.id = g2.error_geographic_item_id').
# where("(g1.geographic_item_id IS NOT NULL OR g2.error_geographic_item_id IS NOT NULL)").uniq
# @return [Scope] GeographicItem
# This uses an Arel table approach, this is ultimately more decomposable if we need. Of use:
# http://danshultz.github.io/talks/mastering_activerecord_arel <- best
# https://github.com/rails/arel
# http://stackoverflow.com/questions/4500629/use-arel-for-a-nested-set-join-query-and-convert-to-activerecordrelation
# http://rdoc.info/github/rails/arel/Arel/SelectManager
# http://stackoverflow.com/questions/7976358/activerecord-arel-or-condition
#
def with_collecting_event_through_georeferences
geographic_items = GeographicItem.arel_table
georeferences = Georeference.arel_table
g1 = georeferences.alias('a')
g2 = georeferences.alias('b')
c = geographic_items.join(g1, Arel::Nodes::OuterJoin).on(geographic_items[:id].eq(g1[:geographic_item_id]))
.join(g2, Arel::Nodes::OuterJoin).on(geographic_items[:id].eq(g2[:error_geographic_item_id]))
GeographicItem.joins(# turn the Arel back into scope
c.join_sources # translate the Arel join to a join hash(?)
).where(
g1[:id].not_eq(nil).or(g2[:id].not_eq(nil)) # returns a Arel::Nodes::Grouping
).distinct
end
# @return [Scope] include a 'latitude' column
def with_latitude
select(lat_long_sql(:latitude))
end
# @return [Scope] include a 'longitude' column
def with_longitude
select(lat_long_sql(:longitude))
end
# @param [String, GeographicItems]
# @return [Scope]
def intersecting(column_name, *geographic_items)
if column_name.downcase == 'any'
pieces = []
DATA_TYPES.each { |column|
pieces.push(GeographicItem.intersecting(column.to_s, geographic_items).to_a)
}
# @TODO change 'id in (?)' to some other sql construct
GeographicItem.where(id: pieces.flatten.map(&:id))
else
q = geographic_items.flatten.collect { |geographic_item|
"ST_Intersects(#{column_name}, '#{geographic_item.geo_object}' )" # seems like we want this: http://danshultz.github.io/talks/mastering_activerecord_arel/#/15/2
}.join(' or ')
where(q)
end
end
# @param [GeographicItem#id] geographic_item_id
# @param [Float] distance in meters
# @return [ActiveRecord::Relation]
# !! should be distance, not radius?!
def within_radius_of_item(geographic_item_id, distance)
where(within_radius_of_item_sql(geographic_item_id, distance))
end
# @param [String, GeographicItem]
# @return [Scope]
# a SQL fragment for ST_DISJOINT, specifies all geographic_items that have data in column_name
# that are disjoint from the passed geographic_items
def disjoint_from(column_name, *geographic_items)
q = geographic_items.flatten.collect { |geographic_item|
"ST_DISJOINT(#{column_name}::geometry, (#{geometry_sql(geographic_item.to_param,
geographic_item.geo_object_type)}))"
}.join(' and ')
where(q)
end
# @return [Scope]
# see are_contained_in_item_by_id
# @param [String] column_name
# @param [GeographicItem, Array] geographic_items
def are_contained_in_item(column_name, *geographic_items)
are_contained_in_item_by_id(column_name, geographic_items.flatten.map(&:id))
end
# rubocop:disable Metrics/MethodLength
# @param [String] column_name to search
# @param [GeographicItem] geographic_item_ids or array of geographic_item_ids to be tested.
# @return [Scope] of GeographicItems
#
# If this scope is given an Array of GeographicItems as a second parameter,
# it will return the 'OR' of each of the objects against the table.
# SELECT COUNT(*) FROM "geographic_items"
# WHERE (ST_Contains(polygon::geometry, GeomFromEWKT('srid=4326;POINT (0.0 0.0 0.0)'))
# OR ST_Contains(polygon::geometry, GeomFromEWKT('srid=4326;POINT (-9.8 5.0 0.0)')))
#
def are_contained_in_item_by_id(column_name, *geographic_item_ids) # = containing
geographic_item_ids.flatten! # in case there is a array of arrays, or multiple objects
column_name.downcase!
case column_name
when 'any'
part = []
DATA_TYPES.each { |column|
unless column == :geometry_collection
part.push(GeographicItem.are_contained_in_item_by_id(column.to_s, geographic_item_ids).to_a)
end
}
# TODO: change 'id in (?)' to some other sql construct
GeographicItem.where(id: part.flatten.map(&:id))
when 'any_poly', 'any_line'
part = []
DATA_TYPES.each { |column|
if column.to_s.index(column_name.gsub('any_', ''))
part.push(GeographicItem.are_contained_in_item_by_id("#{column}", geographic_item_ids).to_a)
end
}
# TODO: change 'id in (?)' to some other sql construct
GeographicItem.where(id: part.flatten.map(&:id))
else
q = geographic_item_ids.flatten.collect { |geographic_item_id|
# discover the item types, and convert type to database type for 'multi_'
b = GeographicItem.where(id: geographic_item_id)
.pluck(:type)[0].split(':')[2].downcase.gsub('lti', 'lti_')
# a = GeographicItem.find(geographic_item_id).geo_object_type
GeographicItem.containing_sql(column_name, geographic_item_id, b)
}.join(' or ')
q = 'FALSE' if q.blank? # this will prevent the invocation of *ALL* of the GeographicItems, if there are
# no GeographicItems in the request (see CollectingEvent.name_hash(types)).
where(q) # .excluding(geographic_items)
end
end
# rubocop:enable Metrics/MethodLength
# @param [String] column_name
# @param [String] geometry of WKT
# @return [Scope]
# a single WKT geometry is compared against column or columns (except geometry_collection) to find geographic_items
# which are contained in the WKT
def are_contained_in_wkt(column_name, geometry)
column_name.downcase!
# column_name = 'point'
case column_name
when 'any'
part = []
DATA_TYPES.each { |column|
unless column == :geometry_collection
part.push(GeographicItem.are_contained_in_wkt(column.to_s, geometry).pluck(:id).to_a)
end
}
# TODO: change 'id in (?)' to some other sql construct
GeographicItem.where(id: part.flatten)
when 'any_poly', 'any_line'
part = []
DATA_TYPES.each { |column|
if column.to_s.index(column_name.gsub('any_', ''))
part.push(GeographicItem.are_contained_in_wkt("#{column}", geometry).pluck(:id).to_a)
end
}
# TODO: change 'id in (?)' to some other sql construct
GeographicItem.where(id: part.flatten)
else
# column = points, geometry = square
q = "ST_Contains(ST_GeomFromEWKT('srid=4326;#{geometry}'), #{column_name}::geometry)"
where(q) # .excluding(geographic_items)
end
end
# rubocop:disable Metrics/MethodLength
# containing the items the shape of which is contained in the geographic_item[s] supplied.
# @param column_name [String] can be any of DATA_TYPES, or 'any' to check against all types, 'any_poly' to check
# against 'polygon' or 'multi_polygon', or 'any_line' to check against 'line_string' or 'multi_line_string'.
# CANNOT be 'geometry_collection'.
# @param geographic_items [GeographicItem] Can be a single GeographicItem, or an array of GeographicItem.
# @return [Scope]
def is_contained_by(column_name, *geographic_items)
column_name.downcase!
case column_name
when 'any'
part = []
DATA_TYPES.each { |column|
unless column == :geometry_collection
part.push(GeographicItem.is_contained_by(column.to_s, geographic_items).to_a)
end
}
# @TODO change 'id in (?)' to some other sql construct
GeographicItem.where(id: part.flatten.map(&:id))
when 'any_poly', 'any_line'
part = []
DATA_TYPES.each { |column|
unless column == :geometry_collection
if column.to_s.index(column_name.gsub('any_', ''))
part.push(GeographicItem.is_contained_by(column.to_s, geographic_items).to_a)
end
end
}
# @TODO change 'id in (?)' to some other sql construct
GeographicItem.where(id: part.flatten.map(&:id))
else
q = geographic_items.flatten.collect { |geographic_item|
GeographicItem.reverse_containing_sql(column_name, geographic_item.to_param,
geographic_item.geo_object_type)
}.join(' or ')
where(q) # .excluding(geographic_items)
end
end
# rubocop:enable Metrics/MethodLength
# @param [String, GeographicItem]
# @return [Scope]
def ordered_by_shortest_distance_from(column_name, geographic_item)
if true # check_geo_params(column_name, geographic_item)
select_distance_with_geo_object(column_name, geographic_item)
.where_distance_greater_than_zero(column_name, geographic_item).order('distance')
else
where('false')
end
end
# @param [String, GeographicItem]
# @return [Scope]
def ordered_by_longest_distance_from(column_name, geographic_item)
if true # check_geo_params(column_name, geographic_item)
q = select_distance_with_geo_object(column_name, geographic_item)
.where_distance_greater_than_zero(column_name, geographic_item)
.order('distance desc')
q
else
where('false')
end
end
# @param [String] column_name
# @param [GeographicItem] geographic_item
# @return [String]
def select_distance_with_geo_object(column_name, geographic_item)
select("*, ST_Distance(#{column_name}, GeomFromEWKT('srid=4326;#{geographic_item.geo_object}')) as distance")
end
# @param [String, GeographicItem]
# @return [Scope]
def where_distance_greater_than_zero(column_name, geographic_item)
where("#{column_name} is not null and ST_Distance(#{column_name}, " \
"GeomFromEWKT('srid=4326;#{geographic_item.geo_object}')) > 0")
end
# @param [GeographicItem]
# @return [Scope]
def excluding(geographic_items)
where.not(id: geographic_items)
end
# @return [Scope]
# includes an 'is_valid' attribute (True/False) for the passed geographic_item. Uses St_IsValid.
# @param [RGeo object] geographic_item
def with_is_valid_geometry_column(geographic_item)
where(id: geographic_item.id).select("ST_IsValid(ST_AsBinary(#{geographic_item.geo_object_type})) is_valid")
end
#
# Other
#
# @param [Integer] geographic_item_id1
# @param [Integer] geographic_item_id2
# @return [Float]
def distance_between(geographic_item_id1, geographic_item_id2)
q1 = "ST_Distance(#{GeographicItem::GEOGRAPHY_SQL}, " \
"(#{select_geography_sql(geographic_item_id2)})) as distance"
_q2 = ActiveRecord::Base.send(
:sanitize_sql_array, ['ST_Distance(?, (?)) as distance',
GeographicItem::GEOGRAPHY_SQL,
select_geography_sql(geographic_item_id2)])
GeographicItem.where(id: geographic_item_id1).pluck(Arel.sql(q1)).first
end
# @param [RGeo::Point] point
# @return [Hash]
# as per #inferred_geographic_name_hierarchy but for Rgeo point
def point_inferred_geographic_name_hierarchy(point)
GeographicItem.containing_point(point).ordered_by_area.limit(1).first.inferred_geographic_name_hierarchy
end
# @param [String] type_name ('polygon', 'point', 'line' [, 'circle'])
# @return [String] if type
def eval_for_type(type_name)
retval = 'GeographicItem'
case type_name.upcase
when 'POLYGON'
retval += '::Polygon'
when 'LINESTRING'
retval += '::LineString'
when 'POINT'
retval += '::Point'
when 'MULTIPOLYGON'
retval += '::MultiPolygon'
when 'MULTILINESTRING'
retval += '::MultiLineString'
when 'MULTIPOINT'
retval += '::MultiPoint'
else
retval = nil
end
retval
end
# example, not used
# @param [Integer] geographic_item_id
# @return [RGeo::Geographic object]
def geometry_for(geographic_item_id)
GeographicItem.select(GeographicItem::GEOMETRY_SQL.to_sql + ' AS geometry').find(geographic_item_id)['geometry']
end
# example, not used
# @param [Integer, Array] geographic_item_ids
# @return [Scope]
def st_multi(*geographic_item_ids)
GeographicItem.find_by_sql(
"SELECT ST_Multi(ST_Collect(g.the_geom)) AS singlegeom
FROM (
SELECT (ST_DUMP(#{GeographicItem::GEOMETRY_SQL.to_sql})).geom AS the_geom
FROM geographic_items
WHERE id IN (?))
AS g;", geographic_item_ids.flatten
)
end
# DEPRECATED
# def check_fix_wkt(wkt_string)
# clean_string = wkt_string.downcase.gsub('(', '').gsub(')', '') # # make the string convenient
# if clean_string.include? 'polygon' # # to look for the case we are treating
# coord_string = clean_string.gsub('polygon ', '') # # synthesize a polygon feature -
# the hard way!
# coordinates = parse_wkt_coords(coord_string)
# # check for anti-meridian crossing polygon
# value = '{"type": "Feature", "geometry": {"type": "Polygon",
# "coordinates": [' + coordinates + ']}, "properties": {}}'
# # e.g., value: "{"type":"Feature","geometry":{"type":"Polygon","coordinates":[[[141.6796875,
# 68.46379955520322],[154.3359375,41.64007838467894],
# [-143.0859375,49.49667452747045],[141.6796875,68.46379955520322]]]},"properties":{}}"
# feature = RGeo::GeoJSON.decode(value, :json_parser => :json)
# # e.g., feature: #<RGeo::GeoJSON::Feature:0x3fd189717f4c id=nil geom="POLYGON ((141.6796875
# 68.46379955520322, 154.3359375 41.64007838467894, -143.0859375 49.49667452747045,
# 141.6796875 68.46379955520322))">
# geometry = feature.geometry
# geometry = geometry.as_text
# ob = JSON.parse(value)
# coords = ob['geometry']['coordinates'][0] # get the coordinates
#
# last_x = nil; this_x = nil; anti_chrossed = false # initialize for anti-meridian detection
# last_y = nil; this_y = nil; bias_x = 360 # # this section can be generalized for > 2 crossings
# point_1 = nil; point_1_x = nil; point_1_y = nil;
# point_2 = nil; point_2_x = nil; point_2_y = nil;
# coords_1 = []; coords_2 = [];
# coords.each_with_index { |point, index|
# this_x = coords[index][0] # # get x value
# this_y = coords[index][1] # # get y value
# if (anti_meridian_check(last_x, this_x))
# anti_chrossed = true # # set flag if detector triggers
# bias_x = -360 # # IF we are crossing from east to west
# if (last_x < 0) # # we are crossing from west to east
# bias_x = 360 # # reverse bias
# end
# delta_x = (this_x - last_x) - bias_x # # assume west to east crossing for now
# delta_y = this_y - last_y # # don't care if we cross the equator
# if (point_1 == nil) # # if this is the first crossing
# point_1 = index # # this is the point after which we insert
# point_1_x = -180 # # terminus for western hemisphere
# if last_x > 0 # # wrong assumption, reverse
# point_1_x = -point_1_x
# end
# d_x = point_1_x - last_x # # distance from last point to terminus
# point_1_y = last_y + d_x * delta_y / delta_x
# else
# point_2 = index
# point_2_x = -point_1_x # # this is only true for the degenerate case of only 2 crossings
# d_x = point_2_x - last_x
# point_2_y = last_y + d_x * delta_y / delta_x
# end
# end
# last_x = this_x # # move to next line segment
# last_y = this_y # # until polygon start point
# }
# if (anti_chrossed)
# index_1 = 0; index_2 = 0 # # indices into the constructed semi-polygons
# coords.each_with_index { |point, index|
# if index < point_1 # # first phase, initial points before transit
# coords_1[index] = point # # just transcribe the points to polygon 1
# end
# if index == point_1 # # first transit
# coords_1[point_1] = [point_1_x, point_1_y] # truncate first polygon at anti-meridian
# coords_1[point_1 + 1] = [point_1_x, point_2_y] # continue truncation with second intersection point
# index_1 = index + 2 # # set up next insertion point for first polygon
#
# coords_2[0] = [point_2_x, point_2_y] # begin polygon 2 with the mirror line in the opposite direction
# coords_2[1] = [point_2_x, point_1_y] # then first intersection where x is fixed at anti-meridian
# coords_2[2] = point # # continue second polygon with first point past transition
# index_2 = 3 # # set up next insertion point
# end
# if index > point_1 && index < point_2 # # continue second polygon from its stub
# coords_2[index_2] = point # # transcribe the next point(s)
# index_2 = index_2 + 1
# end
# if index == point_2 # # second transit
# coords_2[index_2] = [point_2_x, point_2_y] # # end the second polygon with the mirror line origin point
# coords_1[index_1] = point # # copy the current original point to the first polygon
# index_1 = index_1 + 1 # # update its pointer, finished with polygon 2
# end
# if index > point_2 # # final phase, finish up polygon 1
# coords_1[index_1] = point # # transcribe any remaining points
# index_1 = index_1 + 1 # # update its pointer until we reach the initial point
# end
# }
#
# ob["geometry"]["type"] = 'MultiPolygon'
# ob["geometry"]["coordinates"] = [] # # replace the original coordinates
# ob["geometry"]["coordinates"].push([]) # # replace the original coordinates
# ob["geometry"]["coordinates"].push([]) # # replace the original coordinates
# ob["geometry"]["coordinates"][0].push(coords_2) # # replace the original coordinates
# ob["geometry"]["coordinates"][1].push(coords_1) # # append first coordinates with second
# job = ob.as_json.to_s.gsub('=>', ':') # # change back to a feature string
# my_feature = RGeo::GeoJSON.decode(job, :json_parser => :json) # # replicate "normal" steps above
# geometry = my_feature.geometry.as_text # # extract the WKT
# geometry
# else
# wkt_string
# end
# else
# wkt_string
# end
# end
# DEPRECATED
# def anti_meridian_check(last_x, this_x) # returns true if anti-meridian crossed
# if last_x
# if last_x <= 0
# if (((this_x >= 0 || this_x < -180))) # sign change from west to east
# xm = (0.5 * (this_x - last_x)).abs # find intersection
# if (xm > 90)
# return true
# end
# end
# end
# if last_x >= 0
# if (((this_x <= 0) || this_x > 180))
# xm = (0.5 * (last_x - this_x)).abs
# if (xm > 90)
# return true
# end
# end
# end
# end
# false
# end
# DEPRECATED
# def parse_wkt_coords(wkt_coords)
# points = wkt_coords.split(',')
# coordinates = '['
# points.each_with_index { |point, index|
# pointxy = point.split(' ')
# coordinates += '[' + pointxy[0] + ', ' + pointxy[1] + ']'
# if index < points.count - 1
# coordinates += ', '
# end
# }
# coordinates += ']'
# coordinates
# end
end # class << self
# @return [Hash]
# a quick, geographic area hierarchy based approach to
# returning country, state, and county categories
# !! Note this just takes the first referenced GeographicArea, which should be safe most cases
def quick_geographic_name_hierarchy
v = {}
a = geographic_areas.first.try(:geographic_name_classification)
v = a unless a.nil?
v
end
# @return [Hash]
# a slower, gis-based inference approach to
# returning country, state, and county categories
def inferred_geographic_name_hierarchy
v = {}
# !! Ordering by name is arbitrary, and likely to cause downstream problems,
# but might solve non-deterministic merge issue.
# !! The real solution here is to add a sort to prioritize by gazeteer.
# !! This ordering basically means that if two areas with country (for example) level are found,
# the first in the alphabet is selected, then sorting by id if equally named
(containing_geographic_areas
.joins(:geographic_areas_geographic_items)
.merge(GeographicAreasGeographicItem.ordered_by_data_origin)
.order('geographic_areas.name') +
geographic_areas
.joins(:geographic_areas_geographic_items)
.merge(GeographicAreasGeographicItem
.ordered_by_data_origin)
.order('geographic_areas.name').limit(1)).each do |a|
v.merge!(a.categorize)
end
v
end
# @return [Scope]
# the Geographic Areas that contain (gis) this geographic item
def containing_geographic_areas
GeographicArea.joins(:geographic_items).includes(:geographic_area_type)
.joins("JOIN (#{GeographicItem.containing(id).to_sql}) j on geographic_items.id = j.id")
end
# @return [Boolean]
# whether stored shape is ST_IsValid
def valid_geometry?
GeographicItem.with_is_valid_geometry_column(self).first['is_valid']
end
# @return [Array of latitude, longitude]
# the lat, lon of the first point in the GeoItem, see subclass for #st_start_point
def start_point
o = st_start_point
[o.y, o.x]
end
# @return [Array]
# the lat, long, as STRINGs for the centroid of this geographic item
def center_coords
r = GeographicItem.find_by_sql("Select split_part(ST_AsLatLonText(ST_Centroid(#{GeographicItem::GEOMETRY_SQL.to_sql}), " \
"'D.DDDDDD'), ' ', 1) latitude, split_part(ST_AsLatLonText(ST_Centroid" \
"(#{GeographicItem::GEOMETRY_SQL.to_sql}), 'D.DDDDDD'), ' ', 2) " \
"longitude from geographic_items where id = #{id};")[0]
[r.latitude, r.longitude]
end
# @return [RGeo::Geographic::ProjectedPointImpl]
# representing the centroid of this geographic item
def centroid
# Gis::FACTORY.point(*center_coords.reverse)
return geo_object if type == 'GeographicItem::Point'
return Gis::FACTORY.parse_wkt(self.st_centroid)
end
# @param [Integer] geographic_item_id
# @return [Double] distance in meters (slower, more accurate)
def st_distance(geographic_item_id) # geo_object
q1 = "ST_Distance((#{GeographicItem.select_geography_sql(id)}), " \
"(#{GeographicItem.select_geography_sql(geographic_item_id)})) as d"
_q2 = ActiveRecord::Base.send(:sanitize_sql_array, ['ST_Distance((?),(?)) as d',
GeographicItem.select_geography_sql(self.id),
GeographicItem.select_geography_sql(geographic_item_id)])
deg = GeographicItem.where(id: id).pluck(Arel.sql(q1)).first
deg * Utilities::Geo::ONE_WEST
end
alias_method :distance_to, :st_distance
# @param [Integer] geographic_item_id
# @return [Double] distance in meters (faster, less accurate)
def st_distance_spheroid(geographic_item_id)
q1 = "ST_DistanceSpheroid((#{GeographicItem.select_geometry_sql(id)})," \
"(#{GeographicItem.select_geometry_sql(geographic_item_id)}),'#{Gis::SPHEROID}') as distance"
_q2 = ActiveRecord::Base.send(:sanitize_sql_array, ['ST_DistanceSpheroid((?),(?),?) as distance',
GeographicItem.select_geometry_sql(id),
GeographicItem.select_geometry_sql(geographic_item_id),
Gis::SPHEROID])
GeographicItem.where(id: id).pluck(Arel.sql(q1)).first
end
# @return [String]
# a WKT POINT representing the centroid of the geographic item
def st_centroid
GeographicItem.where(id: to_param)
.pluck(Arel.sql("ST_AsEWKT(ST_Centroid(#{GeographicItem::GEOMETRY_SQL.to_sql}))"))
.first.gsub(/SRID=\d*;/, '')
end
# @return [Integer]
# the number of points in the geometry
def st_npoints
GeographicItem.where(id: id).pluck(Arel.sql("ST_NPoints(#{GeographicItem::GEOMETRY_SQL.to_sql}) as npoints")).first
end
# @return [Symbol]
# the geo type (i.e. column like :point, :multipolygon). References the first-found object,
# according to the list of DATA_TYPES, or nil
def geo_object_type
if self.class.name == 'GeographicItem' # a proxy check for new records
geo_type
else
self.class::SHAPE_COLUMN
end
end
# !!TODO: migrate these to use native column calls this to "native"
# @return [RGeo instance, nil]
# the Rgeo shape (See http://rubydoc.info/github/dazuma/rgeo/RGeo/Feature)
def geo_object
if r = geo_object_type # rubocop:disable Lint/AssignmentInCondition
send(r)
else
false
end
end
# @param [geo_object]
# @return [Boolean]
def contains?(target_geo_object)
return nil if target_geo_object.nil?
self.geo_object.contains?(target_geo_object)
end
# @param [geo_object]
# @return [Boolean]
def within?(target_geo_object)
self.geo_object.within?(target_geo_object)
end
# @param [geo_object]
# @return [Boolean]
def intersects?(target_geo_object)
self.geo_object.intersects?(target_geo_object)
end
# @TODO doesn't work?
# @param [geo_object]
# @return [Boolean]
def distance?(target_geo_object)
self.geo_object.distance?(target_geo_object)
end
# @param [geo_object, Double]
# @return [Boolean]
def near(target_geo_object, distance)
self.geo_object.buffer(distance).contains?(target_geo_object)
end
# @param [geo_object, Double]
# @return [Boolean]
def far(target_geo_object, distance)
!near(target_geo_object, distance)
end
# @return [GeoJSON hash]
# via Rgeo apparently necessary for GeometryCollection
def rgeo_to_geo_json
RGeo::GeoJSON.encode(geo_object).to_json
end
# @return [GeoJSON hash]
# raw Postgis (much faster)
def to_geo_json
JSON.parse(GeographicItem.connection.select_all("SELECT ST_AsGeoJSON(#{geo_object_type}::geometry) a " \
"FROM geographic_items WHERE id=#{id};").first['a'])
end
# rubocop:disable Style/StringHashKeys
# @return [GeoJSON Feature] the shape as a GeoJSON Feature
def to_geo_json_feature
@geometry ||= to_geo_json
{
'type' => 'Feature',
'geometry' => geometry,
'properties' => {
'geographic_item' => {
'id' => id}
}
}
end
# rubocop:enable Style/StringHashKeys
# '{"type":"Feature","geometry":{"type":"Point","coordinates":[2.5,4.0]},"properties":{"color":"red"}}'
# '{"type":"Feature","geometry":{"type":"Polygon","coordinates":"[[[-125.29394388198853, 48.584480409793],
# [-67.11035013198853, 45.09937589848195],[-80.64550638198853, 25.01924647619111],[-117.55956888198853,
# 32.5591595028449],[-125.29394388198853, 48.584480409793]]]"},"properties":{}}'
# @param [String] value
# @return [Boolean, RGeo object]
def shape=(value)
unless value.blank?
geom = RGeo::GeoJSON.decode(value, json_parser: :json)
this_type = JSON.parse(value)['geometry']['type']
# TODO: @tuckerjd isn't this set automatically? Or perhaps the callback isn't hit in this approach?
self.type = GeographicItem.eval_for_type(this_type) unless geom.nil?
raise('GeographicItem.type not set.') if type.blank?
object = Gis::FACTORY.parse_wkt(geom.geometry.to_s)
write_attribute(this_type.underscore.to_sym, object)
geom
end
end
protected
# @return [Symbol]
# returns the attribute (column name) containing data
# nearly all methods should use #geo_object_type, not geo_type
def geo_type
DATA_TYPES.each { |item|
return item if send(item)
}
nil
end
# @return [Boolean, String] false if already set, or type to which it was set
def set_type_if_geography_present
if type.blank?
column = geo_type
self.type = "GeographicItem::#{column.to_s.camelize}" if column
end
end
# @param [RGeo::Point] point
# @return [Array] of a point
def point_to_a(point)
data = []
data.push(point.x, point.y)
data
end
# @param [RGeo::Point] point
# @return [Hash] of a point
def point_to_hash(point)
{points: [point_to_a(point)]}
end
# @param [RGeo::MultiPoint] multi_point
# @return [Array] of points
def multi_point_to_a(multi_point)
data = []
multi_point.each { |point|
data.push([point.x, point.y])
}
data
end
# @return [Hash] of points
def multi_point_to_hash(_multi_point)
# when we encounter a multi_point type, we only stick the points into the array, NOT it's identity as a group
{points: multi_point_to_a(multi_point)}
end
# @param [Reo::LineString] line_string
# @return [Array] of points in the line
def line_string_to_a(line_string)
data = []
line_string.points.each { |point|
data.push([point.x, point.y])
}
data
end
# @param [Reo::LineString] line_string
# @return [Hash] of points in the line
def line_string_to_hash(line_string)
{lines: [line_string_to_a(line_string)]}
end
# @param [RGeo::Polygon] polygon
# @return [Array] of points in the polygon (exterior_ring ONLY)
def polygon_to_a(polygon)
# TODO: handle other parts of the polygon; i.e., the interior_rings (if they exist)
data = []
polygon.exterior_ring.points.each { |point|
data.push([point.x, point.y])
}
data
end
# @param [RGeo::Polygon] polygon
# @return [Hash] of points in the polygon (exterior_ring ONLY)
def polygon_to_hash(polygon)
{polygons: [polygon_to_a(polygon)]}
end
# @return [Array] of line_strings as arrays of points
# @param [RGeo::MultiLineString] multi_line_string
def multi_line_string_to_a(multi_line_string)
data = []
multi_line_string.each { |line_string|
line_data = []
line_string.points.each { |point|
line_data.push([point.x, point.y])
}
data.push(line_data)
}
data
end
# @return [Hash] of line_strings as hashes of points
def multi_line_string_to_hash(_multi_line_string)
{lines: to_a}
end
# @param [RGeo::MultiPolygon] multi_polygon
# @return [Array] of arrays of points in the polygons (exterior_ring ONLY)
def multi_polygon_to_a(multi_polygon)
data = []
multi_polygon.each { |polygon|
polygon_data = []
polygon.exterior_ring.points.each { |point|
polygon_data.push([point.x, point.y])
}
data.push(polygon_data)
}
data
end
# @return [Hash] of hashes of points in the polygons (exterior_ring ONLY)
def multi_polygon_to_hash(_multi_polygon)
{polygons: to_a}
end
# validation
# @return [Boolean] iff there is one and only one shape column set
def some_data_is_provided
data = []
DATA_TYPES.each do |item|
data.push(item) unless send(item).blank?
end
errors.add(:base, 'must contain at least one of [point, line_string, etc.].') if data.count == 0
if data.length > 1
data.each do |object|
errors.add(object, 'Only one of [point, line_string, etc.] can be provided.')
end
end
true
end
end
Dir[Rails.root.to_s + '/app/models/geographic_item/**/*.rb'].each { |file| require_dependency file }