method

skip_callback

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What's this?

skip_callback(name, *filter_list, &block) public

Skip a previously set callback. Like set_callback, :if or :unless options may be passed in order to control when the callback is skipped.

class Writer < PersonRecord
  attr_accessor :age
  skip_callback :save, :before, :saving_message, if: -> { age > 18 }
end

When if option returns true, callback is skipped.

writer = Writer.new
writer.age = 20
writer.save

Output:

- save
saved

When if option returns false, callback is NOT skipped.

young_writer = Writer.new
young_writer.age = 17
young_writer.save

Output:

saving...
- save
saved

An ArgumentError will be raised if the callback has not already been set (unless the :raise option is set to false).

Show source

# File activesupport/lib/active_support/callbacks.rb, line 802
        def skip_callback(name, *filter_list, &block)
          type, filters, options = normalize_callback_params(filter_list, block)

          options[:raise] = true unless options.key?(:raise)

          __update_callbacks(name) do |target, chain|
            filters.each do |filter|
              callback = chain.find { |c| c.matches?(type, filter) }

              if !callback && options[:raise]
                raise ArgumentError, "#{type.to_s.capitalize} #{name} callback #{filter.inspect} has not been defined"
              end

              if callback && (options.key?(:if) || options.key?(:unless))
                new_callback = callback.merge_conditional_options(chain, if_option: options[:if], unless_option: options[:unless])
                chain.insert(chain.index(callback), new_callback)
              end

              chain.delete(callback)
            end
            target.set_callbacks name, chain
          end
        end

skip_callback

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