Method: ActiveSupport::Callbacks::ClassMethods#skip_callback

Defined in:
activesupport/lib/active_support/callbacks.rb

#skip_callback(name, *filter_list, &block) ⇒ Object

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

Note: this example uses PersonRecord and #saving_message, which you can see defined here

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).



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# File 'activesupport/lib/active_support/callbacks.rb', line 786

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