method

build_through_record

rails latest stable - Class: ActiveRecord::Associations::HasManyThroughAssociation

build_through_record(record)

private

The through record (built with build_record) is temporarily cached so that it may be reused if insert_record is subsequently called.

However, after insert_record has been called, the cache is cleared in order to allow multiple instances of the same record in an association.

# File activerecord/lib/active_record/associations/has_many_through_association.rb, line 56
        def build_through_record(record)
          @through_records[record] ||= begin
            ensure_mutable

            attributes = through_scope_attributes
            attributes[source_reflection.name] = record

            through_association.build(attributes).tap do |new_record|
              new_record.send("#{source_reflection.foreign_type}=", options[:source_type]) if options[:source_type]
            end
          end
        end

build_through_record

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