module AbstractController::Callbacks::ClassMethods

# File actionpack/lib/abstract_controller/callbacks.rb, line 91
def _insert_callbacks(callbacks, block = nil)
  options = callbacks.extract_options!
  _normalize_callback_options(options)
  callbacks.push(block) if block
  callbacks.each do |callback|
    yield callback, options
  end
end

Take callback names and an optional callback proc, normalize them, then call the block with each callback. This allows us to abstract the normalization across several methods that use it.

Parameters

• callbacks - An array of callbacks, with an optional options hash as the last parameter.

• block - A proc that should be added to the callbacks.

Block Parameters

• name - The callback to be added.

• options - A hash of options to be used when adding the callback.

# File actionpack/lib/abstract_controller/callbacks.rb, line 66
def _normalize_callback_options(options)
  _normalize_callback_option(options, :only, :if)
  _normalize_callback_option(options, :except, :unless)
end

If :only or :except are used, convert the options into the :if and :unless options of ActiveSupport::Callbacks.

The basic idea is that :only => :index gets converted to :if => proc {|c| c.action_name == "index" }.

Note that :only has priority over :if in case they are used together.

only: :index, if: -> { true } # the :if option will be ignored.

Note that :if has priority over :except in case they are used together.

except: :index, if: -> { true } # the :except option will be ignored.

Options

• only - The callback should be run only for this action.

• except - The callback should be run for all actions except this action.

# File actionpack/lib/abstract_controller/callbacks.rb, line 141
      

Append a callback after actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 162
      

Append a callback after actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 190
      

Append a callback around actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 130
      

Append a callback before actions. See _insert_callbacks for parameter details.

If the callback renders or redirects, the action will not run. If there are additional callbacks scheduled to run after that callback, they are also cancelled.

# File actionpack/lib/abstract_controller/callbacks.rb, line 169
      

Append a callback around actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 101
      

Append a callback before actions. See _insert_callbacks for parameter details.

If the callback renders or redirects, the action will not run. If there are additional callbacks scheduled to run after that callback, they are also cancelled.

# File actionpack/lib/abstract_controller/callbacks.rb, line 148
      

Prepend a callback after actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 176
      

Prepend a callback around actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 112
      

Prepend a callback before actions. See _insert_callbacks for parameter details.

If the callback renders or redirects, the action will not run. If there are additional callbacks scheduled to run after that callback, they are also cancelled.

# File actionpack/lib/abstract_controller/callbacks.rb, line 155
      

Skip a callback after actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 183
      

Skip a callback around actions. See _insert_callbacks for parameter details.

# File actionpack/lib/abstract_controller/callbacks.rb, line 123
      

Skip a callback before actions. See _insert_callbacks for parameter details.