require "abstract_controller/base"
require "abstract_controller/logger"
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 AbstractController::Logger
included do
extlib_inheritable_accessor :_view_paths
self._view_paths ||= ActionView::PathSet.new
end
# Initialize controller with nil formats.
def initialize(*) #:nodoc:
@_formats = nil
super
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<Hash>:: see _render_partial in ActionView::Base
# View#render_template[template, layout, options, partial]
# - Returns String with the rendered template
# template<ActionView::Template>:: The template to render
# layout<ActionView::Template>:: The layout to render around the template
# options<Hash>:: See _render_template_with_layout in ActionView::Base
# partial<Boolean>:: 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<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::Rendering.body_to_s(render_to_body(options))
end
# Renders the template from an object.
#
# ==== Options
# _template<ActionView::Template>:: The template to render
# _layout<ActionView::Template>:: The layout to wrap the template in (optional)
# _partial<TrueClass, FalseClass>:: 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<ActionView::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<String>:: The prefix to look inside of. In a file system, this corresponds
# to a directory.
# _partial<TrueClass, FalseClass>:: Whether or not the file to look up is a partial
def _determine_template(options)
if options.key?(:text)
options[:_template] = ActionView::Template::Text.new(options[:text], format_for_text)
elsif options.key?(:inline)
handler = ActionView::Template.handler_class_for_extension(options[:type] || "erb")
template = ActionView::Template.new(options[:inline], "inline template", handler, {})
options[:_template] = template
elsif options.key?(:template)
options[:_template_name] = options[:template]
elsif options.key?(:file)
options[:_template_name] = options[:file]
end
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
def format_for_text
Mime[:text]
end
module ClassMethods
def clear_template_caches!
end
# Append a path to the list of view paths for this controller.
#
# ==== Parameters
# path<String, ViewPath>:: 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<String, ViewPath>:: 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<ViewPathSet, Object>:: 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
