rails prepend_view_path of mountable engine

Question

In one hand, I have a mountable engine let's say Front Front contain my assets and couple of pages It's isolated from MainApp. I don't want it to touch the main app.

In the other hand I want my MainApp using layout and partial of the Front. So I setup the layout this way :

class ApplicationController < ActionController::Base
    layout 'front/application'
end

But the front/application refer to engine partial directly, because of isolation, like this

render 'header' # front/ prefix is not required

So the MainApp views try to load app/views/application/header instead of app/views/front/application/header

To fixe this I put a prepend_view_path like this :

class ApplicationController < ActionController::Base
    layout 'front/application'
    before_filter :prepend_front
protected
    def prepend_front
       prepend_view_path "app/views/front"
    end
end

But this doesn't work because engine path point into the vendor. The engine add it self this to the prepend path list : ~/main_app/vendor/private_gems/front-0.0.2/app/views And my preprend_front method create this : ~/main_app/app/views/front

I tryed to prepend by force the correct path (but it looks so dirty) :

prepend_view_path "#{Rails.root}/vendor/private_gems/front-0.0.2/app/views/front"

I doesn't work, just crash the app ...

And I'm stuck here. Maybe my design is wrong?

Answer 1

Finally I remove the isolate property. I moved my views one folder up, so out of the engine_app folders.

The only final ajustement was to include EngineApp::Engine.url_helper into the MainApp application controller.

The prepend stack look like this :

• Main App prepended path
• Main App views
• Engine views

So it's based on the engine, then add main app stuff on the top.