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Move rendering from AP to AV

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This commit is contained in:
Łukasz Strzałkowski 2013-06-26 13:40:46 +02:00
parent e772b098ed
commit 5759531a95
7 changed files with 189 additions and 613 deletions
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1
actionpack/lib/abstract_controller.rb
View file

@ -13,7 +13,6 @@ module AbstractController
autoload :Helpers
autoload :Layouts
autoload :Logger
autoload :Rendering
autoload :Translation
autoload :AssetPaths
autoload :UrlFor

423
actionpack/lib/abstract_controller/layouts.rb
View file

@ -1,423 +0,0 @@
require "active_support/core_ext/module/remove_method"
module AbstractController
# Layouts reverse the common pattern of including shared headers and footers in many templates to isolate changes in
# repeated setups. The inclusion pattern has pages that look like this:
#
# <%= render "shared/header" %>
# Hello World
# <%= render "shared/footer" %>
#
# This approach is a decent way of keeping common structures isolated from the changing content, but it's verbose
# and if you ever want to change the structure of these two includes, you'll have to change all the templates.
#
# With layouts, you can flip it around and have the common structure know where to insert changing content. This means
# that the header and footer are only mentioned in one place, like this:
#
# // The header part of this layout
# <%= yield %>
# // The footer part of this layout
#
# And then you have content pages that look like this:
#
# hello world
#
# At rendering time, the content page is computed and then inserted in the layout, like this:
#
# // The header part of this layout
# hello world
# // The footer part of this layout
#
# == Accessing shared variables
#
# Layouts have access to variables specified in the content pages and vice versa. This allows you to have layouts with
# references that won't materialize before rendering time:
#
# <h1><%= @page_title %></h1>
# <%= yield %>
#
# ...and content pages that fulfill these references _at_ rendering time:
#
# <% @page_title = "Welcome" %>
# Off-world colonies offers you a chance to start a new life
#
# The result after rendering is:
#
# <h1>Welcome</h1>
# Off-world colonies offers you a chance to start a new life
#
# == Layout assignment
#
# You can either specify a layout declaratively (using the #layout class method) or give
# it the same name as your controller, and place it in <tt>app/views/layouts</tt>.
# If a subclass does not have a layout specified, it inherits its layout using normal Ruby inheritance.
#
# For instance, if you have PostsController and a template named <tt>app/views/layouts/posts.html.erb</tt>,
# that template will be used for all actions in PostsController and controllers inheriting
# from PostsController.
#
# If you use a module, for instance Weblog::PostsController, you will need a template named
# <tt>app/views/layouts/weblog/posts.html.erb</tt>.
#
# Since all your controllers inherit from ApplicationController, they will use
# <tt>app/views/layouts/application.html.erb</tt> if no other layout is specified
# or provided.
#
# == Inheritance Examples
#
# class BankController < ActionController::Base
# # bank.html.erb exists
#
# class ExchangeController < BankController
# # exchange.html.erb exists
#
# class CurrencyController < BankController
#
# class InformationController < BankController
# layout "information"
#
# class TellerController < InformationController
# # teller.html.erb exists
#
# class EmployeeController < InformationController
# # employee.html.erb exists
# layout nil
#
# class VaultController < BankController
# layout :access_level_layout
#
# class TillController < BankController
# layout false
#
# In these examples, we have three implicit lookup scenarios:
# * The BankController uses the "bank" layout.
# * The ExchangeController uses the "exchange" layout.
# * The CurrencyController inherits the layout from BankController.
#
# However, when a layout is explicitly set, the explicitly set layout wins:
# * The InformationController uses the "information" layout, explicitly set.
# * The TellerController also uses the "information" layout, because the parent explicitly set it.
# * The EmployeeController uses the "employee" layout, because it set the layout to nil, resetting the parent configuration.
# * The VaultController chooses a layout dynamically by calling the <tt>access_level_layout</tt> method.
# * The TillController does not use a layout at all.
#
# == Types of layouts
#
# Layouts are basically just regular templates, but the name of this template needs not be specified statically. Sometimes
# you want to alternate layouts depending on runtime information, such as whether someone is logged in or not. This can
# be done either by specifying a method reference as a symbol or using an inline method (as a proc).
#
# The method reference is the preferred approach to variable layouts and is used like this:
#
# class WeblogController < ActionController::Base
# layout :writers_and_readers
#
# def index
# # fetching posts
# end
#
# private
# def writers_and_readers
# logged_in? ? "writer_layout" : "reader_layout"
# end
# end
#
# Now when a new request for the index action is processed, the layout will vary depending on whether the person accessing
# is logged in or not.
#
# If you want to use an inline method, such as a proc, do something like this:
#
# class WeblogController < ActionController::Base
# layout proc { |controller| controller.logged_in? ? "writer_layout" : "reader_layout" }
# end
#
# If an argument isn't given to the proc, it's evaluated in the context of
# the current controller anyway.
#
# class WeblogController < ActionController::Base
# layout proc { logged_in? ? "writer_layout" : "reader_layout" }
# end
#
# Of course, the most common way of specifying a layout is still just as a plain template name:
#
# class WeblogController < ActionController::Base
# layout "weblog_standard"
# end
#
# The template will be looked always in <tt>app/views/layouts/</tt> folder. But you can point
# <tt>layouts</tt> folder direct also. <tt>layout "layouts/demo"</tt> is the same as <tt>layout "demo"</tt>.
#
# Setting the layout to nil forces it to be looked up in the filesystem and fallbacks to the parent behavior if none exists.
# Setting it to nil is useful to re-enable template lookup overriding a previous configuration set in the parent:
#
# class ApplicationController < ActionController::Base
# layout "application"
# end
#
# class PostsController < ApplicationController
# # Will use "application" layout
# end
#
# class CommentsController < ApplicationController
# # Will search for "comments" layout and fallback "application" layout
# layout nil
# end
#
# == Conditional layouts
#
# If you have a layout that by default is applied to all the actions of a controller, you still have the option of rendering
# a given action or set of actions without a layout, or restricting a layout to only a single action or a set of actions. The
# <tt>:only</tt> and <tt>:except</tt> options can be passed to the layout call. For example:
#
# class WeblogController < ActionController::Base
# layout "weblog_standard", except: :rss
#
# # ...
#
# end
#
# This will assign "weblog_standard" as the WeblogController's layout for all actions except for the +rss+ action, which will
# be rendered directly, without wrapping a layout around the rendered view.
#
# Both the <tt>:only</tt> and <tt>:except</tt> condition can accept an arbitrary number of method references, so
# #<tt>except: [ :rss, :text_only ]</tt> is valid, as is <tt>except: :rss</tt>.
#
# == Using a different layout in the action render call
#
# If most of your actions use the same layout, it makes perfect sense to define a controller-wide layout as described above.
# Sometimes you'll have exceptions where one action wants to use a different layout than the rest of the controller.
# You can do this by passing a <tt>:layout</tt> option to the <tt>render</tt> call. For example:
#
# class WeblogController < ActionController::Base
# layout "weblog_standard"
#
# def help
# render action: "help", layout: "help"
# end
# end
#
# This will override the controller-wide "weblog_standard" layout, and will render the help action with the "help" layout instead.
module Layouts
extend ActiveSupport::Concern
include Rendering
included do
class_attribute :_layout, :_layout_conditions, :instance_accessor => false
self._layout = nil
self._layout_conditions = {}
_write_layout_method
end
delegate :_layout_conditions, to: :class
module ClassMethods
def inherited(klass) # :nodoc:
super
klass._write_layout_method
end
# This module is mixed in if layout conditions are provided. This means
# that if no layout conditions are used, this method is not used
module LayoutConditions # :nodoc:
private
# Determines whether the current action has a layout definition by
# checking the action name against the :only and :except conditions
# set by the <tt>layout</tt> method.
#
# ==== Returns
# * <tt> Boolean</tt> - True if the action has a layout definition, false otherwise.
def _conditional_layout?
return unless super
conditions = _layout_conditions
if only = conditions[:only]
only.include?(action_name)
elsif except = conditions[:except]
!except.include?(action_name)
else
true
end
end
end
# Specify the layout to use for this class.
#
# If the specified layout is a:
# String:: the String is the template name
# Symbol:: call the method specified by the symbol, which will return the template name
# false:: There is no layout
# true:: raise an ArgumentError
# nil:: Force default layout behavior with inheritance
#
# ==== Parameters
# * <tt>layout</tt> - The layout to use.
#
# ==== Options (conditions)
# * :only - A list of actions to apply this layout to.
# * :except - Apply this layout to all actions but this one.
def layout(layout, conditions = {})
include LayoutConditions unless conditions.empty?
conditions.each {|k, v| conditions[k] = Array(v).map {|a| a.to_s} }
self._layout_conditions = conditions
self._layout = layout
_write_layout_method
end
# If no layout is supplied, look for a template named the return
# value of this method.
#
# ==== Returns
# * <tt>String</tt> - A template name
def _implied_layout_name # :nodoc:
controller_path
end
# Creates a _layout method to be called by _default_layout .
#
# If a layout is not explicitly mentioned then look for a layout with the controller's name.
# if nothing is found then try same procedure to find super class's layout.
def _write_layout_method # :nodoc:
remove_possible_method(:_layout)
prefixes = _implied_layout_name =~ /\blayouts/ ? [] : ["layouts"]
default_behavior = "lookup_context.find_all('#{_implied_layout_name}', #{prefixes.inspect}).first || super"
name_clause = if name
default_behavior
else
<<-RUBY
super
RUBY
end
layout_definition = case _layout
when String
_layout.inspect
when Symbol
<<-RUBY
#{_layout}.tap do |layout|
return #{default_behavior} if layout.nil?
unless layout.is_a?(String) || !layout
raise ArgumentError, "Your layout method :#{_layout} returned \#{layout}. It " \
"should have returned a String, false, or nil"
end
end
RUBY
when Proc
define_method :_layout_from_proc, &_layout
protected :_layout_from_proc
<<-RUBY
result = _layout_from_proc(#{_layout.arity == 0 ? '' : 'self'})
return #{default_behavior} if result.nil?
result
RUBY
when false
nil
when true
raise ArgumentError, "Layouts must be specified as a String, Symbol, Proc, false, or nil"
when nil
name_clause
end
self.class_eval <<-RUBY, __FILE__, __LINE__ + 1
def _layout
if _conditional_layout?
#{layout_definition}
else
#{name_clause}
end
end
private :_layout
RUBY
end
end
def _normalize_options(options) # :nodoc:
super
if _include_layout?(options)
layout = options.delete(:layout) { :default }
options[:layout] = _layout_for_option(layout)
end
end
attr_internal_writer :action_has_layout
def initialize(*) # :nodoc:
@_action_has_layout = true
super
end
# Controls whether an action should be rendered using a layout.
# If you want to disable any <tt>layout</tt> settings for the
# current action so that it is rendered without a layout then
# either override this method in your controller to return false
# for that action or set the <tt>action_has_layout</tt> attribute
# to false before rendering.
def action_has_layout?
@_action_has_layout
end
private
def _conditional_layout?
true
end
# This will be overwritten by _write_layout_method
def _layout; end
# Determine the layout for a given name, taking into account the name type.
#
# ==== Parameters
# * <tt>name</tt> - The name of the template
def _layout_for_option(name)
case name
when String then _normalize_layout(name)
when Proc then name
when true then Proc.new { _default_layout(true) }
when :default then Proc.new { _default_layout(false) }
when false, nil then nil
else
raise ArgumentError,
"String, Proc, :default, true, or false, expected for `layout'; you passed #{name.inspect}"
end
end
def _normalize_layout(value)
value.is_a?(String) && value !~ /\blayouts/ ? "layouts/#{value}" : value
end
# Returns the default layout for this controller.
# Optionally raises an exception if the layout could not be found.
#
# ==== Parameters
# * <tt>require_layout</tt> - If set to true and layout is not found,
# an ArgumentError exception is raised (defaults to false)
#
# ==== Returns
# * <tt>template</tt> - The template object for the default layout (or nil)
def _default_layout(require_layout = false)
begin
value = _layout if action_has_layout?
rescue NameError => e
raise e, "Could not render layout: #{e.message}"
end
if require_layout && action_has_layout? && !value
raise ArgumentError,
"There was no default layout for #{self.class} in #{view_paths.inspect}"
end
_normalize_layout(value)
end
def _include_layout?(options)
(options.keys & [:text, :inline, :partial]).empty? || options.key?(:layout)
end
end
end

187
actionpack/lib/abstract_controller/rendering.rb
View file

@ -1,6 +1,3 @@
require "abstract_controller/base"
require "action_view"
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\"."
@ -9,188 +6,4 @@ module AbstractController
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 = respond_to?(:_routes) && _routes
helpers = respond_to?(:_helpers) && _helpers
Class.new(ActionView::Base) do
if routes
include routes.url_helpers
include routes.mounted_helpers
end
if helpers
include helpers
end
end
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.
#
# 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 Action Controller 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
# Raw rendering of a template.
# :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 = [
:@_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_variables
variables -= protected_instance_variables
variables -= DEFAULT_PROTECTED_INSTANCE_VARIABLES
variables.each { |name| hash[name[1..-1]] = 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?(?/) ? :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

2
actionpack/lib/action_controller/metal/rendering.rb
View file

@ -2,7 +2,7 @@ module ActionController
module Rendering
extend ActiveSupport::Concern
include AbstractController::Rendering
include ActionView::Rendering
# Before processing, set the request formats in current controller formats.
def process_action(*) #:nodoc:

2
actionpack/lib/action_controller/metal/streaming.rb
View file

@ -193,7 +193,7 @@ module ActionController #:nodoc:
module Streaming
extend ActiveSupport::Concern
include AbstractController::Rendering
include ActionView::Rendering
protected

1
actionview/lib/action_view.rb
View file

@ -36,6 +36,7 @@ module ActionView
autoload :LookupContext
autoload :PathSet
autoload :RecordIdentifier
autoload :Rendering
autoload :RoutingUrlFor
autoload :Template
autoload :ViewPaths

186
actionview/lib/action_view/rendering.rb Normal file
View file

@ -0,0 +1,186 @@
module ActionView
# 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 ActionView::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 = respond_to?(:_routes) && _routes
helpers = respond_to?(:_helpers) && _helpers
Class.new(ActionView::Base) do
if routes
include routes.url_helpers
include routes.mounted_helpers
end
if helpers
include helpers
end
end
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.
#
# 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 Action Controller 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
# Raw rendering of a template.
# :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 = [
:@_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_variables
variables -= protected_instance_variables
variables -= DEFAULT_PROTECTED_INSTANCE_VARIABLES
variables.each { |name| hash[name[1..-1]] = 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?(?/) ? :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