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Contents
# frozen_string_literal: true
require 'rom/relation/loaded'
require 'rom/relation/materializable'
require 'rom/pipeline'
module ROM
class Relation
# Left-to-right relation composition used for data-pipelining
#
# @api public
class Composite < Pipeline::Composite
include Materializable
# Call the pipeline by passing results from left to right
#
# Optional args are passed to the left object
#
# @return [Loaded]
#
# @api public
def call(*args)
relation = left.call(*args)
response = right.call(relation)
if response.is_a?(Loaded)
response
else
relation.new(response)
end
end
alias_method :[], :call
# @see Relation#map_to
#
# @api public
def map_to(klass)
self >> left.map_to(klass).mapper
end
private
# @api private
#
# @see Pipeline::Proxy#decorate?
#
# @api private
def decorate?(response)
super || response.is_a?(Graph)
end
end
end
end
Version data entries
15 entries across 15 versions & 1 rubygems