Controller action is called twice

Question

I've noticed, that "index" action of my controller is called twice.

The action has following structure:

def index

  if params[:tags].nil?
     # [fork #1] just return the whole collection of model
     @items = Item.all
  else
     # [fork #2] filter items by tags
     @items = Item.select_by_tags params[:tags]
  end

  # Another operations with @items
  # The result will be incorrect, because, when tags in params are specified,
  # controller action will be first executed for fork #2, and then for fork #1.
  # In view, i get @items from fork #2 and result of THIS piece of code for fork #1
end

On the page i have links with URLs, like "/items?tags=tag1, tag2", clicking on them i get "index" action, called twice

I have no idea, why this happens ...

Answer 1

I've figured it out.

The reason of such a behavior was a JavaScript code, being called after page load. This code implements deep-linking for some parts of the page.

Be careful about this.

Thanks.