I am creating REST API and also using Authorization in REST API. Whenever a user is not authorized for a action it redirects to home page using the following code

```
rescue_from CanCan::AccessDenied do |exception|
  redirect_to "/", :alert => exception.message
end

```

For Rest API method, I don't want to be redirected to this page on unauthorized access. Instead, I want to display json 

> 
> {"Error\_msg": "Not Authorized"}.
> 
> 
> 

My controller has following code:

```
authorize_resource :class => false, :only => [:create_or_update]

```

where `create_or_update` is an action(method) on which I want to check authorization.

My ability.rb has following code in `editor` role

```
can :create_or_update, :topology

```

Can someone help me not getting redirected to home page only for this action.