method

conditional

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conditional(callback_sequence, user_callback, user_conditions) private

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# File activesupport/lib/active_support/callbacks.rb, line 176
        def self.conditional(callback_sequence, user_callback, user_conditions)
          callback_sequence.before do |env|
            target = env.target
            value  = env.value

            if user_conditions.all? { |c| c.call(target, value) }
              user_callback.call target, value
            end

            env
          end
        end

conditional

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