require "abstract_controller/logger" module AbstractController module RenderingController extend ActiveSupport::Concern include AbstractController::Logger included do attr_internal :formats extlib_inheritable_accessor :_view_paths self._view_paths ||= ActionView::PathSet.new end # An instance of a view class. The default view class is ActionView::Base # # The view class must have the following methods: # View.for_controller[controller] Create a new ActionView instance for a # controller # View#render_partial[options] # - responsible for setting options[:_template] # - Returns String with the rendered partial # options:: see _render_partial in ActionView::Base # View#render_template[template, layout, options, partial] # - Returns String with the rendered template # template:: The template to render # layout:: The layout to render around the template # options:: See _render_template_with_layout in ActionView::Base # partial:: Whether or not the template to render is a partial # # Override this method in a to change the default behavior. def view_context @_view_context ||= ActionView::Base.for_controller(self) end # Mostly abstracts the fact that calling render twice is a DoubleRenderError. # Delegates render_to_body and sticks the result in self.response_body. def render(*args) if response_body raise AbstractController::DoubleRenderError, "OMG" end self.response_body = render_to_body(*args) end # Raw rendering of a template to a Rack-compatible body. # # ==== Options # _partial_object:: The object that is being rendered. If this # exists, we are in the special case of rendering an object as a partial. # # :api: plugin def render_to_body(options = {}) # TODO: Refactor so we can just use the normal template logic for this if options.key?(:partial) view_context.render_partial(options) else _determine_template(options) _render_template(options) end end # Raw rendering of a template to a string. Just convert the results of # render_to_body into a String. # # :api: plugin def render_to_string(options = {}) AbstractController::RenderingController.body_to_s(render_to_body(options)) end # Renders the template from an object. # # ==== Options # _template:: The template to render # _layout:: The layout to wrap the template in (optional) # _partial:: Whether or not the template to be rendered is a partial def _render_template(options) view_context.render_template(options) end # The list of view paths for this controller. See ActionView::ViewPathSet for # more details about writing custom view paths. def view_paths _view_paths end # Return a string representation of a Rack-compatible response body. def self.body_to_s(body) if body.respond_to?(:to_str) body else strings = [] body.each { |part| strings << part.to_s } body.close if body.respond_to?(:close) strings.join end end private # Take in a set of options and determine the template to render # # ==== Options # _template:: If this is provided, the search is over # _template_name<#to_s>:: The name of the template to look up. Otherwise, # use the current action name. # _prefix:: The prefix to look inside of. In a file system, this corresponds # to a directory. # _partial:: Whether or not the file to look up is a partial def _determine_template(options) name = (options[:_template_name] || action_name).to_s options[:_template] ||= with_template_cache(name) do find_template(name, { :formats => formats }, options) end end def find_template(name, details, options) view_paths.find(name, details, options[:_prefix], options[:_partial]) end def template_exists?(name, details, options) view_paths.exists?(name, details, options[:_prefix], options[:_partial]) end def with_template_cache(name) yield end module ClassMethods def clear_template_caches! end # Append a path to the list of view paths for this controller. # # ==== Parameters # path:: If a String is provided, it gets converted into # the default view path. You may also provide a custom view path # (see ActionView::ViewPathSet for more information) def append_view_path(path) self.view_paths << path end # Prepend a path to the list of view paths for this controller. # # ==== Parameters # path:: If a String is provided, it gets converted into # the default view path. You may also provide a custom view path # (see ActionView::ViewPathSet for more information) def prepend_view_path(path) clear_template_caches! self.view_paths.unshift(path) end # A list of all of the default view paths for this controller. def view_paths self._view_paths end # Set the view paths. # # ==== Parameters # paths:: If a ViewPathSet is provided, use that; # otherwise, process the parameter into a ViewPathSet. def view_paths=(paths) clear_template_caches! self._view_paths = paths.is_a?(ActionView::PathSet) ? paths : ActionView::Base.process_view_paths(paths) end end end end