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check_validity!() public

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# File activerecord/lib/active_record/reflection.rb, line 192
      def check_validity!
        if options[:through]
          if through_reflection.nil?
            raise HasManyThroughAssociationNotFoundError.new(active_record.name, self)
          end
          
          if source_reflection.nil?
            raise HasManyThroughSourceAssociationNotFoundError.new(self)
          end

          if options[:source_type] && source_reflection.options[:polymorphic].nil?
            raise HasManyThroughAssociationPointlessSourceTypeError.new(active_record.name, self, source_reflection)
          end
          
          if source_reflection.options[:polymorphic] && options[:source_type].nil?
            raise HasManyThroughAssociationPolymorphicError.new(active_record.name, self, source_reflection)
          end
          
          unless [:belongs_to, :has_many].include?(source_reflection.macro) && source_reflection.options[:through].nil?
            raise HasManyThroughSourceAssociationMacroError.new(self)
          end
        end
      end
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