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Contents
require 'rom/associations/abstract'
module ROM
module Associations
# Abstract many-to-one association type
#
# @api public
class ManyToOne < Abstract
# Adapters must implement this method
#
# @abstract
#
# @api public
def call(*)
raise NotImplementedError
end
# Return configured or inferred FK name
#
# @return [Symbol]
#
# @api public
def foreign_key
definition.foreign_key || source.foreign_key(target.name)
end
# Associate child with a parent
#
# @param [Hash] child The child tuple
# @param [Hash] parent The parent tuple
#
# @return [Hash]
#
# @api private
def associate(child, parent)
fk, pk = join_key_map
child.merge(fk => parent.fetch(pk))
end
protected
# Return foreign key on the source side
#
# @return [Symbol]
#
# @api protected
def source_key
foreign_key
end
# Return primary key on the target side
#
# @return [Symbol]
#
# @api protected
def target_key
target.schema.primary_key_name
end
memoize :foreign_key
end
end
end
Version data entries
10 entries across 10 versions & 1 rubygems