Module: Redpen::HostRouteHelpers

Included in:
ApplicationController
Defined in:
lib/redpen/host_route_helpers.rb

Overview

Route helpers of the host app that the engine doesn't define itself, routed through main_app.

The engine's controllers inherit from the host's (see Redpen.parent_controller), so host code such as a before_action redirecting to new_session_path runs inside the engine, where route helpers resolve against the engine's routes and raise UrlGenerationError. For every helper the host has and the engine doesn't, this defines a method delegating to the host's routes, so that code keeps working unchanged. The pattern is Mission Control Jobs' (MIT, 37signals).

Helpers both define, like root_path, keep resolving to the engine's; use main_app.root_path.

Class Method Summary collapse

Class Method Details

.define_from(host_routes, engine_routes) ⇒ Object 



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# File 'lib/redpen/host_route_helpers.rb', line 14

def define_from(host_routes, engine_routes)
  undefine_all

  (host_routes.named_routes.helper_names - engine_routes.named_routes.helper_names).each do |name|
    define_method(name) { |*args| main_app.public_send(name, *args) }
    defined_helpers << name
  end
end