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configure_dependency_for_has_one(reflection) private

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# File activerecord/lib/active_record/associations.rb, line 1195
        def configure_dependency_for_has_one(reflection)
          if reflection.options.include?(:dependent)
            case reflection.options[:dependent]
              when :destroy
                module_eval "before_destroy '#{reflection.name}.destroy unless #{reflection.name}.nil?'"
              when :delete
                module_eval "before_destroy '#{reflection.class_name}.delete(#{reflection.name}.id) unless #{reflection.name}.nil?'"
              when :nullify
                module_eval "before_destroy '#{reflection.name}.update_attribute(\"#{reflection.primary_key_name}\", nil) unless #{reflection.name}.nil?'"
              else
                raise ArgumentError, "The :dependent option expects either :destroy, :delete or :nullify (#{reflection.options[:dependent].inspect})"
            end
          end
        end
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