lib/grape/validations/types/custom_type_collection_coercer.rb
# frozen_string_literal: true
module Grape
module Validations
module Types
# See {CustomTypeCoercer} for details on types
# that will be supported by this by this coercer.
# This coercer works in the same way as +CustomTypeCoercer+
# except that it expects to receive an array of strings to
# coerce and will return an array (or optionally, a set)
# of coerced values.
#
# +CustomTypeCoercer+ is already capable of providing type
# checking for arrays where an independent coercion method
# is supplied. As such, +CustomTypeCollectionCoercer+ does
# not allow for such a method to be supplied independently
# of the type.
class CustomTypeCollectionCoercer < CustomTypeCoercer
# A new coercer for collections of the given type.
#
# @param type [Class,#parse]
# type to which items in the array should be coerced.
# Must implement a +parse+ method which accepts a string,
# and for the purposes of type-checking it may either be
# a class, or it may implement a +coerced?+, +parsed?+ or
# +call+ method (in that order of precedence) which
# accepts a single argument and returns true if the given
# array item has been coerced correctly.
# @param set [Boolean]
# when true, a +Set+ will be returned by {#call} instead
# of an +Array+ and duplicate items will be discarded.
def initialize(type, set = false)
super(type)
@set = set
end
# Coerces the given value.
#
# @param value [Array<String>] an array of values to be coerced
# @return [Array,Set] the coerced result. May be an +Array+ or a
# +Set+ depending on the setting given to the constructor
def call(value)
coerced = value.map do |item|
coerced_item = super(item)
return coerced_item if coerced_item.is_a?(InvalidValue)
coerced_item
end
@set ? Set.new(coerced) : coerced
end
end
end
end
end