lib/neography/property.rb
module Neography
module Property
def [](key)
@table[key.to_sym]
end
def []=(key, value)
key = key.to_sym
k_str = key.to_s
if value.nil?
unless @table[key].nil?
if node?
neo_server.remove_node_properties(self.neo_id, [k_str])
else
neo_server.remove_relationship_properties(self.neo_id, [k_str])
end
end
remove_ostruct_member(key)
else
if node?
neo_server.set_node_properties(self.neo_id, {k_str => value})
else
neo_server.set_relationship_properties(self.neo_id, {k_str => value})
end
new_ostruct_member(key, value)
end
end
# Set many properties at once and only issue one http
# request and update the node/relationship instance on the fly.
#
# To remove a property, set its value to nil.
def set_properties(hash)
hash.each do |key, value|
add_or_remove_ostruct_member(key, value)
end
rest_reset_properties
end
# As #set_properties, but this one hard resets the node's/relationship's
# properties to exactly what's given in the hash.
def reset_properties(hash)
@table.keys.each{|key| remove_ostruct_member(key)}
hash.each{|key,value| new_ostruct_member(key,value)}
rest_reset_properties
end
def add_or_remove_ostruct_member(name, value)
if value.nil?
remove_ostruct_member(name)
else
new_ostruct_member(name, value)
end
end
def new_ostruct_member(name, value)
name = name.to_sym
@table[name] = value
unless self.respond_to?(name)
meta = class << self; self; end
meta.send(:define_method, name) { @table[name] }
meta.send(:define_method, "#{name}=") do |new_value|
self[name.to_sym] = new_value
end
end
name
end
def remove_ostruct_member(name)
@table.delete(name.to_sym)
meta = class << self; self; end
names = [name, "#{name}="].map(&:to_sym)
names.each do |n|
meta.send(:remove_method, n) if self.respond_to?(n)
end
end
def method_missing(method_sym, *arguments, &block)
if (method_sym.to_s =~ /=$/) != nil
new_ostruct_member(method_sym.to_s.chomp("="), *arguments)
# We just defined the getter/setter above, but we haven't actually
# applied them yet.
self.send(method_sym, *arguments)
else
super
end
end
def attributes
@table.keys
end
def node?
self.is_a?(Neography::Node)
end
private
def rest_reset_properties
if node?
neo_server.reset_node_properties(self.neo_id, @table)
else
neo_server.reset_relationship_properties(self.neo_id, @table)
end
end
end
end