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# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
class ThroughAssociation < Association # :nodoc:
PRELOADER = ActiveRecord::Associations::Preloader.new
def initialize(*)
super
@already_loaded = owners.first.association(through_reflection.name).loaded?
end
def preloaded_records
@preloaded_records ||= source_preloaders.flat_map(&:preloaded_records)
end
def records_by_owner
return @records_by_owner if defined?(@records_by_owner)
source_records_by_owner = source_preloaders.map(&:records_by_owner).reduce(:merge)
through_records_by_owner = through_preloaders.map(&:records_by_owner).reduce(:merge)
@records_by_owner = owners.each_with_object({}) do |owner, result|
through_records = through_records_by_owner[owner] || []
if @already_loaded
if source_type = reflection.options[:source_type]
through_records = through_records.select do |record|
record[reflection.foreign_type] == source_type
end
end
end
records = through_records.flat_map do |record|
source_records_by_owner[record]
end
records.compact!
records.sort_by! { |rhs| preload_index[rhs] } if scope.order_values.any?
records.uniq! if scope.distinct_value
result[owner] = records
end
end
private
def source_preloaders
@source_preloaders ||= PRELOADER.preload(middle_records, source_reflection.name, scope)
end
def middle_records
through_preloaders.flat_map(&:preloaded_records)
end
def through_preloaders
@through_preloaders ||= PRELOADER.preload(owners, through_reflection.name, through_scope)
end
def through_reflection
reflection.through_reflection
end
def source_reflection
reflection.source_reflection
end
def preload_index
@preload_index ||= preloaded_records.each_with_object({}).with_index do |(record, result), index|
result[record] = index
end
end
def through_scope
scope = through_reflection.klass.unscoped
options = reflection.options
values = reflection_scope.values
if annotations = values[:annotate]
scope.annotate!(*annotations)
end
if options[:source_type]
scope.where! reflection.foreign_type => options[:source_type]
elsif !reflection_scope.where_clause.empty?
scope.where_clause = reflection_scope.where_clause
if includes = values[:includes]
scope.includes!(source_reflection.name => includes)
else
scope.includes!(source_reflection.name)
end
if values[:references] && !values[:references].empty?
scope.references!(values[:references])
else
scope.references!(source_reflection.table_name)
end
if joins = values[:joins]
scope.joins!(source_reflection.name => joins)
end
if left_outer_joins = values[:left_outer_joins]
scope.left_outer_joins!(source_reflection.name => left_outer_joins)
end
if scope.eager_loading? && order_values = values[:order]
scope = scope.order(order_values)
end
end
scope
end
end
end
end
end
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