module

Callbacks

This module allows to define callbacks.

Example usage:

require "callbacks"

class MyClass
  include Callbacks

  def call
    with_callbacks do
      puts "call"
    end
  end

  before do
    puts "before"
  end

  before do
    puts "another before"
  end

  after do
    puts "after"
  end

  after do
    puts "another after"
  end
end

MyClass.new.call

# => before
# => another before
# => call
# => after
# => another after

Objects including Callbacks can be inherited, please refer to each method's description for more information.

Instance methods

with_callbacks

Source

Macros

after

Add after callback.

Further after callbacks are called later in the scope of a single object. When defined in children, their after callbacks have lower precedence:

class Foo
  include Callbacks

  after do
    puts "1"
  end

  after do
    puts "2"
  end
end

class Bar < Foo
  after do
    puts "3"
  end
end

Bar.new.with_callbacks { puts "call" }
# => call, 1, 2, 3

Source

before

Add before callback.

Further before callbacks are called later in the scope of a single object. When defined in children, their before callbacks have higher precedence:

class Foo
  include Callbacks

  before do
    puts "1"
  end

  before do
    puts "2"
  end
end

class Bar < Foo
  before do
    puts "3"
  end
end

Bar.new.with_callbacks { puts "call" }
# => 3, 1, 2, call

Source