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rails--rails/actionpack/lib/abstract_controller/base.rb
Ryuta Kamizono c81af6ae72 Enable Layout/EmptyLinesAroundAccessModifier cop
We sometimes say "✂️ newline after `private`" in a code review (e.g.
https://github.com/rails/rails/pull/18546#discussion_r23188776,
https://github.com/rails/rails/pull/34832#discussion_r244847195).

Now `Layout/EmptyLinesAroundAccessModifier` cop have new enforced style
`EnforcedStyle: only_before` (https://github.com/rubocop-hq/rubocop/pull/7059).

That cop and enforced style will reduce the our code review cost.
2019-06-13 12:00:45 +09:00

266 lines
9.4 KiB
Ruby

# frozen_string_literal: true
require "abstract_controller/error"
require "active_support/configurable"
require "active_support/descendants_tracker"
require "active_support/core_ext/module/anonymous"
require "active_support/core_ext/module/attr_internal"
module AbstractController
# Raised when a non-existing controller action is triggered.
class ActionNotFound < StandardError
end
# 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.
class Base
##
# Returns the body of the HTTP response sent by the controller.
attr_internal :response_body
##
# Returns the name of the action this controller is processing.
attr_internal :action_name
##
# Returns the formats that can be processed by the controller.
attr_internal :formats
include ActiveSupport::Configurable
extend ActiveSupport::DescendantsTracker
class << self
attr_reader :abstract
alias_method :abstract?, :abstract
# Define a controller as abstract. See internal_methods for more
# details.
def abstract!
@abstract = true
end
def inherited(klass) # :nodoc:
# Define the abstract ivar on subclasses so that we don't get
# uninitialized ivar warnings
unless klass.instance_variable_defined?(:@abstract)
klass.instance_variable_set(:@abstract, false)
end
super
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.
# (<tt>ActionController::Metal</tt> and ActionController::Base are defined as abstract)
def internal_methods
controller = self
controller = controller.superclass until controller.abstract?
controller.public_instance_methods(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
# * <tt>Set</tt> - A set of all methods that should be considered actions.
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.
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
# * <tt>String</tt>
def controller_path
@controller_path ||= name.sub(/Controller$/, "").underscore unless anonymous?
end
# Refresh the cached action_methods when a new action_method is added.
def method_added(name)
super
clear_action_methods!
end
end
abstract!
# 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
# * <tt>self</tt>
def process(action, *args)
@_action_name = action.to_s
unless action_name = _find_action_name(@_action_name)
raise ActionNotFound, "The action '#{action}' could not be found for #{self.class.name}"
end
@_response_body = nil
process_action(action_name, *args)
end
# Delegates to the class' ::controller_path
def controller_path
self.class.controller_path
end
# Delegates to the class' ::action_methods
def action_methods
self.class.action_methods
end
# Returns true if a method for the action is available and
# can be dispatched, false otherwise.
#
# Notice that <tt>action_methods.include?("foo")</tt> may return
# false and <tt>available_action?("foo")</tt> returns true because
# this method considers actions that are also available
# through other means, for example, implicit render ones.
#
# ==== Parameters
# * <tt>action_name</tt> - The name of an action to be tested
def available_action?(action_name)
_find_action_name(action_name)
end
# Tests if a response body is set. Used to determine if the
# +process_action+ callback needs to be terminated in
# +AbstractController::Callbacks+.
def performed?
response_body
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.
def self.supports_path?
true
end
private
# Returns true if the name can be considered an action because
# it has a method defined in the controller.
#
# ==== Parameters
# * <tt>name</tt> - The name of an action to be tested
def action_method?(name)
self.class.action_methods.include?(name)
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.
def process_action(method_name, *args)
send_action(method_name, *args)
end
# Actually call the method associated with the action. Override
# this method if you wish to change how action methods are called,
# not to add additional behavior around it. For example, you would
# override #send_action if you want to inject arguments into the
# method.
alias send_action send
# 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.
def _handle_action_missing(*args)
action_missing(@_action_name, *args)
end
# 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
# * <tt>action_name</tt> - An action name to find a method name for
#
# ==== Returns
# * <tt>string</tt> - The name of the method that handles the action
# * false - No valid method name could be found.
# Raise +AbstractController::ActionNotFound+.
def _find_action_name(action_name)
_valid_action_name?(action_name) && method_for_action(action_name)
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
# * <tt>action_name</tt> - An action name to find a method name for
#
# ==== Returns
# * <tt>string</tt> - The name of the method that handles the action
# * <tt>nil</tt> - No method name could be found.
def method_for_action(action_name)
if action_method?(action_name)
action_name
elsif respond_to?(:action_missing, true)
"_handle_action_missing"
end
end
# Checks if the action name is valid and returns false otherwise.
def _valid_action_name?(action_name)
!action_name.to_s.include? File::SEPARATOR
end
end
end