Rails conditional redirect after delete

Question

I'm trying to redirect after a delete depending on where the user came from.

This is the current code in the event controller:

def destroy
  @event = Event.find(params[:id])
  @event.destroy

  respond_to do |format|
    format.html { redirect_to events_url }
    format.json { head :no_content }
  end
end

I changed it to this (thanks MrYoshiji):

format.html { redirect_to :back }

That works if the user was deleting from all pages except the Event show page. Because you then get an error trying to show a record you just deleted.

So, I'm trying to use a params to tell the destroy code where to redirect to.

I'm trying this:

def destroy
  @event = Event.find(params[:id])
  @event.destroy
  @return_url

  respond_to do |format|
    format.html { redirect_to @return_url }
    format.json { head :no_content }
  end
end

But, I don't know how to pass the @return_url as a param in the link_to on a show page.

    <%= link_to 'Delete', @event, params(@return_url => "some url"), confirm: 'Are you sure?', method: :delete, :class => 'btn btn-danger' %>

How would I pass the url as a param?

Thanks!!

UPDATE1

I changed the Event controller to this:

 def destroy
   @expense = Expense.find(params[:id])
   redirect_url = (request.referer.include?("#{@event.id}/show") ? events_url : :back)
   @expense.destroy

   respond_to do |format|
     format.html { redirect_to redirect_url }
     format.json { head :ok }
   end
 end

This redirects back to the correct page the "Delete Event" button is on - except when I click that button on the show page for the Event.

The redirect wants to show the deleted record.

UDPATE2

OK this worked for my app:

    redirect_url = (request.referer.include?("/events/#{@event.id}") ? events_url : :back)

THANKS FOR ALL THE HELP !!

Answer 1

As I commented, you could do the following:

def destroy
  @event = Event.find(params[:id])
  @event.destroy
  redirect_url = (request.referer.include?("#{@event.id}/show") ? events_url : :back)

  respond_to do |format|
    format.html { redirect_to redirect_url }
    format.json { head :no_content }
  end
end

(I am not sure you can access to @event.id right after you deleted it, if not, destroy it after we set the redirect_url

Answer 2

In your view:

<%= link_to 'Delete', event_path(@event, url), confirm: 'Are you sure?', method: :delete, :class => 'btn btn-danger' %>

Here I'm passing the url variable as a parameter to the controller.

In controller:

...
@return_url = params[:url]
...

Hope this helps!