build(associations, base_klass) private

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# File activerecord/lib/active_record/associations/join_dependency.rb, line 234
      def build(associations, base_klass)
        associations.map do |name, right|
          reflection = find_reflection base_klass, name
          reflection.check_validity!
          reflection.check_eager_loadable!

          if reflection.polymorphic?
            raise EagerLoadPolymorphicError.new(reflection)
          end

          JoinAssociation.new reflection, build(right, reflection.klass)
        end
      end
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