method

association_primary_key

v3.1.0 - Show latest stable - 0 notes - Class: ActiveRecord::Reflection::ThroughReflection

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What's this?

association_primary_key() public

We want to use the klass from this reflection, rather than just delegate straight to the source_reflection, because the source_reflection may be polymorphic. We still need to respect the source_reflection’s :primary_key option, though.

Show source

# File activerecord/lib/active_record/reflection.rb, line 478
      def association_primary_key
        @association_primary_key ||= begin
          # Get the "actual" source reflection if the immediate source reflection has a
          # source reflection itself
          source_reflection = self.source_reflection
          while source_reflection.source_reflection
            source_reflection = source_reflection.source_reflection
          end

          source_reflection.options[:primary_key] || klass.primary_key
        end
      end

association_primary_key

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