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# frozen_string_literal: true
module ActiveRecord
module Associations
class Preloader
module ThroughAssociation #:nodoc:
def run(preloader)
already_loaded = owners.first.association(through_reflection.name).loaded?
through_scope = through_scope()
reflection_scope = target_reflection_scope
through_preloaders = preloader.preload(owners, through_reflection.name, through_scope)
middle_records = through_preloaders.flat_map(&:preloaded_records)
preloaders = preloader.preload(middle_records, source_reflection.name, reflection_scope)
@preloaded_records = preloaders.flat_map(&:preloaded_records)
owners.each do |owner|
through_records = Array(owner.association(through_reflection.name).target)
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
else
owner.association(through_reflection.name).reset if through_scope
end
result = through_records.flat_map do |record|
association = record.association(source_reflection.name)
target = association.target
association.reset if preload_scope
target
end
result.compact!
if reflection_scope
result.sort_by! { |rhs| preload_index[rhs] } if reflection_scope.order_values.any?
result.uniq! if reflection_scope.distinct_value
end
associate_records_to_owner(owner, result)
end
end
private
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 |(id, result), index|
result[id] = index
end
end
def through_scope
scope = through_reflection.klass.unscoped
options = reflection.options
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
values = reflection_scope.values
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 unless scope.empty_scope?
end
def target_reflection_scope
if preload_scope
reflection_scope.merge(preload_scope)
elsif reflection.scope
reflection_scope
else
nil
end
end
end
end
end
end
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