build(associations, base_klass) private

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# File activerecord/lib/active_record/associations/join_dependency.rb, line 236
        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?
              next unless @eager_loading
              raise EagerLoadPolymorphicError.new(reflection)
            end

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