How to access rails application routes in rails models

With the newer version of rails, application itself is an engine which is the initialized format of abstract class Rails::Application and to access routes of any (host) engine the code is

SomeRailsApplicationName::Application.routes.url_helpers.named_route_path
SomeRailsApplicationName::Application.routes.url_helpers.named_route_path(parameter: 'something')

and for a (mountable) engine the code is

SomeMountableEngineName::Engine.routes.url_helpers.named_route_path
SomeMountableEngineName::Engine.routes.url_helpers.named_route_path(parameter: 'something'

Example:

rails console > Helloworld::Application.routes.url_helpers.about_path
 => "/about"

rails console > BambooUser::Engine.routes.url_helpers.login_path
 => "/users/login"

InvalidAuthenticityToken while file upload in rails 4

Hi Friends,

Am back again and this time really after a long time. Actually occupied with my current company and it is bootstrapping :) wish me luck.

Any how recent problem that i faced was, uploading file (multipart form request) was giving "ActionController::InvalidAuthenticityToken" error in rails4 while a normal form post was working great, which is kind of strange and it was giving error for synchronous and asynchronous request both.

So whats the way to fix it ? 

Add your own authenticity_token params which is missing in rails form (which is strange again) but add a hidden field something like

<%= hidden_field_tag :authenticity_token, form_authenticity_token -%>

and now everything is back to normal :) i hope for you too.

Thanks

Praveen