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Contents
# encoding: utf-8
module Mongoid
module Relations
# Used for converting foreign key values to the correct type based on the
# types of ids that the document stores.
#
# @note Durran: The name of this class is this way to match the metadata
# getter, and foreign_key was already taken there.
class Constraint
attr_reader :metadata
# Create the new constraint with the metadata.
#
# @example Instantiate the constraint.
# Constraint.new(metdata)
#
# @param [ Metadata ] metadata The metadata of the relation.
#
# @since 2.0.0.rc.7
def initialize(metadata)
@metadata = metadata
end
# Convert the supplied object to the appropriate type to set as the
# foreign key for a relation.
#
# @example Convert the object.
# constraint.convert("12345")
#
# @param [ Object ] object The object to convert.
#
# @return [ Object ] The object cast to the correct type.
#
# @since 2.0.0.rc.7
def convert(object)
return convert_polymorphic(object) if metadata.polymorphic?
klass, field = metadata.klass, metadata.klass.fields["_id"]
if klass.using_object_ids?
BSON::ObjectId.mongoize(object)
elsif object.is_a?(::Array)
object.map!{ |obj| field.mongoize(obj) }
else
field.mongoize(object)
end
end
private
def convert_polymorphic(object)
object.respond_to?(:id) ? object.id : object
end
end
end
end
Version data entries
35 entries across 33 versions & 3 rubygems