require 'active_support/concern' require 'active_support/core_ext/class/attribute' require 'action_view' require 'action_view/view_paths' require 'set' 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 module Rendering extend ActiveSupport::Concern include ActionView::ViewPaths # Normalizes arguments, options and then delegates render_to_body and # sticks the result in self.response_body. # :api: public def render(*args, &block) options = _normalize_render(*args, &block) self.response_body = render_to_body(options) _process_format(rendered_format, options) if rendered_format self.response_body end # Raw rendering of a template to a string. # # It is similar to render, except that it does not # set the +response_body+ and it should be guaranteed # to always return a string. # # If a component extends the semantics of +response_body+ # (as ActionController extends it to be anything that # responds to the method each), this method needs to be # overridden in order to still return a string. # :api: plugin def render_to_string(*args, &block) options = _normalize_render(*args, &block) render_to_body(options) end # Performs the actual template rendering. # :api: public def render_to_body(options = {}) end # Returns Content-Type of rendered content # :api: public def rendered_format Mime::TEXT end DEFAULT_PROTECTED_INSTANCE_VARIABLES = Set.new %w( @_action_name @_response_body @_formats @_prefixes @_config @_view_context_class @_view_renderer @_lookup_context @_routes @_db_runtime ).map(&:to_sym) # This method should return a hash with assigns. # You can overwrite this configuration per controller. # :api: public def view_assigns protected_vars = _protected_ivars variables = instance_variables variables.reject! { |s| protected_vars.include? s } variables.each_with_object({}) { |name, hash| hash[name.slice(1, name.length)] = instance_variable_get(name) } 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={}) if action.is_a? Hash action else options end end # Normalize options. # :api: plugin def _normalize_options(options) options end # Process extra options. # :api: plugin def _process_options(options) options end # Process the rendered format. # :api: private def _process_format(format, options = {}) end # Normalize args and options. # :api: private def _normalize_render(*args, &block) options = _normalize_args(*args, &block) #TODO: remove defined? when we restore AP <=> AV dependency if defined?(request) && request && request.variant.present? options[:variant] = request.variant end _normalize_options(options) options end def _protected_ivars # :nodoc: DEFAULT_PROTECTED_INSTANCE_VARIABLES end end end