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require 'active_support/core_ext/module/attr_internal'
module AbstractController
class Error < StandardError; end
class DoubleRenderError < Error
DEFAULT_MESSAGE = "Render and/or redirect were called multiple times in this action. Please note that you may only call render OR redirect, and at most once per action. Also note that neither redirect nor render terminate execution of the action, so if you want to exit an action after redirecting, you need to do something like \"redirect_to(...) and return\"."
def initialize(message = nil)
super(message || DEFAULT_MESSAGE)
end
end
class Base
attr_internal :response_body
attr_internal :action_name
class << self
attr_reader :abstract
def abstract!
@abstract = true
end
alias_method :abstract?, :abstract
def inherited(klass)
::AbstractController::Base.subclasses << klass.to_s
super
end
def subclasses
@subclasses ||= []
end
def internal_methods
controller = self
controller = controller.superclass until controller.abstract?
controller.public_instance_methods(true)
end
def process(action)
new.process(action.to_s)
end
def hidden_actions
[]
end
def action_methods
@action_methods ||=
# All public instance methods of this class, including ancestors
public_instance_methods(true).map { |m| m.to_s }.to_set -
# Except for public instance methods of Base and its ancestors
internal_methods.map { |m| m.to_s } +
# Be sure to include shadowed public instance methods of this class
public_instance_methods(false).map { |m| m.to_s } -
# And always exclude explicitly hidden actions
hidden_actions
end
end
abstract!
def process(action)
@_action_name = action_name = action.to_s
unless action_name = method_for_action(action_name)
raise ActionNotFound, "The action '#{action}' could not be found"
end
process_action(action_name)
self
end
private
def action_methods
self.class.action_methods
end
def action_method?(action)
action_methods.include?(action)
end
# It is possible for respond_to?(action_name) to be false and
# respond_to?(:action_missing) to be false if respond_to_action?
# is overridden in a subclass. For instance, ActionController::Base
# overrides it to include the case where a template matching the
# action_name is found.
def process_action(method_name)
send_action(method_name)
end
alias send_action send
def _handle_action_missing
action_missing(@_action_name)
end
# Override this to change the conditions that will raise an
# ActionNotFound error. If you accept a difference case,
# you must handle it by also overriding process_action and
# handling the case.
def method_for_action(action_name)
if action_method?(action_name) then action_name
elsif respond_to?(:action_missing, true) then "_handle_action_missing"
end
end
end
end
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