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module ActiveRecord
module Associations
class Preloader
module ThroughAssociation #:nodoc:
def through_reflection
reflection.through_reflection
end
def source_reflection
reflection.source_reflection
end
def associated_records_by_owner
through_records = through_records_by_owner
ActiveRecord::Associations::Preloader.new(
through_records.values.flatten,
source_reflection.name, options
).run
through_records.each do |owner, records|
records.map! { |r| r.send(source_reflection.name) }.flatten!
records.compact!
end
end
private
def through_records_by_owner
ActiveRecord::Associations::Preloader.new(
owners, through_reflection.name,
through_options
).run
Hash[owners.map do |owner|
through_records = Array.wrap(owner.send(through_reflection.name))
# Dont cache the association - we would only be caching a subset
if reflection.options[:source_type] && through_reflection.collection?
owner.association(through_reflection.name).reset
end
[owner, through_records]
end]
end
def through_options
through_options = {}
if options[:source_type]
through_options[:conditions] = { reflection.foreign_type => options[:source_type] }
else
if options[:conditions]
through_options[:include] = options[:include] || options[:source]
through_options[:conditions] = options[:conditions]
end
through_options[:order] = options[:order]
end
through_options
end
end
end
end
end
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