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tag: v3.2.0
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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:
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?(?/) ? :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
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