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require "abstract_controller/base"
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::ViewPaths
# 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_template[options]
# Returns String with the rendered template
#
# Override this method in a module 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, &block)
options = _normalize_args(*args, &block)
_normalize_options(options)
self.response_body = 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
# 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={})
_normalize_options(options)
AbstractController::Rendering.body_to_s(render_to_body(options))
end
# Find and renders a template based on the options given.
def _render_template(options)
view_context.render_template(options) { |template| _with_template_hook(template) }
end
# The prefix used in render "foo" shortcuts.
def _prefix
controller_path
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
# Normalize options by converting render "foo" to render :action => "foo" and
# render "foo/bar" to render :file => "foo/bar".
def _normalize_args(action=nil, options={})
case action
when NilClass
when Hash
options, action = action, nil
when String, Symbol
action = action.to_s
key = action.include?(?/) ? :file : :action
options[key] = action
else
options.merge!(:partial => action)
end
options
end
def _normalize_options(options)
if options[:partial] == true
options[:partial] = action_name
end
if (options.keys & [:partial, :file, :template]).empty?
options[:_prefix] ||= _prefix
end
options[:template] ||= (options[:action] || action_name).to_s
options
end
def _process_options(options)
end
def _with_template_hook(template)
self.formats = template.details[:formats]
end
end
end
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