The defaults are 'name' for sort and 'basic' for tag. They are set in methods within the controller and model for not being redundant.
The linking itself works perfectly fine and the jQuery itself, too. However if I add the jQuery to the linking, the parameters will not get passed and so can not be merged. I guess when the page is reloaded there is no parameter set and jQuery does not pass the first one I click on. Though somehow in Ryan Bates' Railscast it does work and even if I download it, it works just fine. Does anybody know what the mistake might be?