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With overwrite_params, I was doing this to prepare a PDF request for a page:
url_for(:overwrite_params => {:format => :pdf})
overwrite_params has been deprecated after Rails 2.3.8, is there a reason for this deprecation? What’s the standard accepted alternative?
Using overwrite_params is allowing you to make mistakes and bad design – you are not protected from overwriting params in urls which are not relevant to your call.
It is much better aways know what is coming. Keep your params in a bean/model and serialize this bean to url.
If you want to break the rules of the good design you can aways do it yourself(with the .merge option) but then it is your responsibility.