require "abstract_controller/base" require "action_view" require "active_support/core_ext/object/instance_variables" module AbstractController 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 # This is a class to fix I18n global state. Whenever you provide I18n.locale during a request, # it will trigger the lookup_context and consequently expire the cache. class I18nProxy < ::I18n::Config #:nodoc: attr_reader :original_config, :lookup_context def initialize(original_config, lookup_context) original_config = original_config.original_config if original_config.respond_to?(:original_config) @original_config, @lookup_context = original_config, lookup_context end def locale @original_config.locale end def locale=(value) @lookup_context.locale = value end end module Rendering extend ActiveSupport::Concern include AbstractController::ViewPaths included do class_attribute :protected_instance_variables self.protected_instance_variables = [] end # Overwrite process to setup I18n proxy. def process(*) #:nodoc: old_config, I18n.config = I18n.config, I18nProxy.new(I18n.config, lookup_context) super ensure I18n.config = old_config end module ClassMethods def view_context_class @view_context_class ||= begin routes = _routes if respond_to?(:_routes) helpers = _helpers if respond_to?(:_helpers) ActionView::Base.prepare(routes, helpers) end end end attr_internal_writer :view_context_class def view_context_class @_view_context_class ||= self.class.view_context_class end # An instance of a view class. The default view class is ActionView::Base # # The view class must have the following methods: # View.new[lookup_context, assigns, controller] # Create a new ActionView instance for a controller # View#render[options] # Returns String with the rendered template # # Override this method in a module to change the default behavior. def view_context view_context_class.new(view_renderer, view_assigns, self) end # Returns an object that is able to render templates. def view_renderer @_view_renderer ||= ActionView::Renderer.new(lookup_context) end # Normalize arguments, options and then delegates render_to_body and # sticks the result in self.response_body. def render(*args, &block) options = _normalize_render(*args, &block) self.response_body = render_to_body(options) end # Raw rendering of a template to a string. Just convert the results of # render_response into a String. # :api: plugin def render_to_string(*args, &block) options = _normalize_render(*args, &block) render_to_body(options) end # Raw rendering of a template to a Rack-compatible body. # :api: plugin def render_to_body(options = {}) _process_options(options) _render_template(options) end # Find and renders a template based on the options given. # :api: private def _render_template(options) #:nodoc: lookup_context.rendered_format = nil if options[:formats] view_renderer.render(view_context, options) end DEFAULT_PROTECTED_INSTANCE_VARIABLES = %w( @_action_name @_response_body @_formats @_prefixes @_config @_view_context_class @_view_renderer @_lookup_context ) # This method should return a hash with assigns. # You can overwrite this configuration per controller. # :api: public def view_assigns hash = {} variables = instance_variable_names variables -= protected_instance_variables variables -= DEFAULT_PROTECTED_INSTANCE_VARIABLES variables.each { |name| hash[name.to_s[1, name.length]] = instance_variable_get(name) } hash end private # Normalize args and options. # :api: private def _normalize_render(*args, &block) options = _normalize_args(*args, &block) _normalize_options(options) options end # Normalize args by converting render "foo" to render :action => "foo" and # render "foo/bar" to render :file => "foo/bar". # :api: plugin def _normalize_args(action=nil, options={}) case action when NilClass when Hash options = action when String, Symbol action = action.to_s key = action.include?(?/) ? :app_template_file : :action options[key] = action else options[:partial] = action end options end # Normalize options. # :api: plugin def _normalize_options(options) if options[:partial] == true options[:partial] = action_name end if (options.keys & [:partial, :file, :template]).empty? options[:prefixes] ||= _prefixes end options[:template] ||= (options[:action] || action_name).to_s options end # Process extra options. # :api: plugin def _process_options(options) end end end