class AbstractController::Base
AbstractController::Base
is a low-level API. Nobody should be using it directly, and subclasses (like ActionController::Base
) are expected to provide their own render
method, since rendering means different things depending on the context.
Attributes
Public Class Methods
Define a controller as abstract. See internal_methods
for more details.
# File lib/abstract_controller/base.rb, line 69 def abstract! @abstract = true end
A list of method names that should be considered actions. This includes all public instance methods on a controller, less any internal methods (see internal_methods
), adding back in any methods that are internal, but still exist on the class itself.
Returns¶ ↑
-
Set
- A set of all methods that should be considered actions.
# File lib/abstract_controller/base.rb, line 103 def action_methods @action_methods ||= begin # All public instance methods of this class, including ancestors methods = (public_instance_methods(true) - # Except for public instance methods of Base and its ancestors internal_methods + # Be sure to include shadowed public instance methods of this class public_instance_methods(false)) methods.map!(&:to_s) methods.to_set end end
action_methods
are cached and there is sometimes a need to refresh them. ::clear_action_methods!
allows you to do that, so next time you run action_methods
, they will be recalculated.
# File lib/abstract_controller/base.rb, line 121 def clear_action_methods! @action_methods = nil end
Returns the full controller name, underscored, without the ending Controller.
class MyApp::MyPostsController < AbstractController::Base end MyApp::MyPostsController.controller_path # => "my_app/my_posts"
Returns¶ ↑
-
String
# File lib/abstract_controller/base.rb, line 135 def controller_path @controller_path ||= name.delete_suffix("Controller").underscore unless anonymous? end
A list of all internal methods for a controller. This finds the first abstract superclass of a controller, and gets a list of all public instance methods on that abstract class. Public instance methods of a controller would normally be considered action methods, so methods declared on abstract classes are being removed. (ActionController::Metal
and ActionController::Base
are defined as abstract)
# File lib/abstract_controller/base.rb, line 88 def internal_methods controller = self controller = controller.superclass until controller.abstract? controller.public_instance_methods(true) end
Refresh the cached action_methods
when a new action_method is added.
# File lib/abstract_controller/base.rb, line 140 def method_added(name) super clear_action_methods! end
Returns true if the given controller is capable of rendering a path. A subclass of AbstractController::Base
may return false. An Email controller for example does not support paths, only full URLs.
# File lib/abstract_controller/base.rb, line 203 def self.supports_path? true end
Public Instance Methods
Delegates to the class' ::action_methods
# File lib/abstract_controller/base.rb, line 174 def action_methods self.class.action_methods end
Returns the name of the action this controller is processing.
# File lib/abstract_controller/base.rb, line 54 attr_internal :action_name
Returns true if a method for the action is available and can be dispatched, false otherwise.
Notice that action_methods.include?("foo")
may return false and available_action?("foo")
returns true because this method considers actions that are also available through other means, for example, implicit render ones.
Parameters¶ ↑
-
action_name
- The name of an action to be tested
# File lib/abstract_controller/base.rb, line 188 def available_action?(action_name) _find_action_name(action_name) end
Delegates to the class' ::controller_path
# File lib/abstract_controller/base.rb, line 169 def controller_path self.class.controller_path end
Returns the formats that can be processed by the controller.
# File lib/abstract_controller/base.rb, line 58 attr_internal :formats
Tests if a response body is set. Used to determine if the process_action
callback needs to be terminated in AbstractController::Callbacks
.
# File lib/abstract_controller/base.rb, line 195 def performed? response_body end
Calls the action going through the entire action dispatch stack.
The actual method that is called is determined by calling method_for_action
. If no method can handle the action, then an AbstractController::ActionNotFound
error is raised.
Returns¶ ↑
-
self
# File lib/abstract_controller/base.rb, line 156 def process(action, *args) @_action_name = action.to_s unless action_name = _find_action_name(@_action_name) raise ActionNotFound.new("The action '#{action}' could not be found for #{self.class.name}", self, action) end @_response_body = nil process_action(action_name, *args) end
Returns the body of the HTTP response sent by the controller.
# File lib/abstract_controller/base.rb, line 50 attr_internal :response_body
Private Instance Methods
Takes an action name and returns the name of the method that will handle the action.
It checks if the action name is valid and returns false otherwise.
See method_for_action
for more information.
Parameters¶ ↑
-
action_name
- An action name to find a method name for
Returns¶ ↑
-
string
- The name of the method that handles the action -
false - No valid method name could be found.
Raise AbstractController::ActionNotFound
.
# File lib/abstract_controller/base.rb, line 259 def _find_action_name(action_name) _valid_action_name?(action_name) && method_for_action(action_name) end
If the action name was not found, but a method called “action_missing” was found, method_for_action
will return “_handle_action_missing”. This method calls action_missing with the current action name.
# File lib/abstract_controller/base.rb, line 241 def _handle_action_missing(*args) action_missing(@_action_name, *args) end
Checks if the action name is valid and returns false otherwise.
# File lib/abstract_controller/base.rb, line 295 def _valid_action_name?(action_name) !action_name.to_s.include? File::SEPARATOR end
Takes an action name and returns the name of the method that will handle the action. In normal cases, this method returns the same name as it receives. By default, if method_for_action
receives a name that is not an action, it will look for an action_missing method and return “_handle_action_missing” if one is found.
Subclasses may override this method to add additional conditions that should be considered an action. For instance, an HTTP controller with a template matching the action name is considered to exist.
If you override this method to handle additional cases, you may also provide a method (like _handle_method_missing
) to handle the case.
If none of these conditions are true, and method_for_action
returns nil
, an AbstractController::ActionNotFound
exception will be raised.
Parameters¶ ↑
-
action_name
- An action name to find a method name for
Returns¶ ↑
-
string
- The name of the method that handles the action -
nil
- No method name could be found.
# File lib/abstract_controller/base.rb, line 286 def method_for_action(action_name) if action_method?(action_name) action_name elsif respond_to?(:action_missing, true) "_handle_action_missing" end end
Call the action. Override this in a subclass to modify the behavior around processing an action. This, and not process
, is the intended way to override action dispatching.
Notice that the first argument is the method to be dispatched which is not necessarily the same as the action name.
# File lib/abstract_controller/base.rb, line 227 def process_action(method_name, *args) send_action(method_name, *args) end