Hello rubyists and railers,

I have a method which checks over a params hash to make sure that it contains certain keys, and to make sure that certain values are set within a certain range. This is for an action that responds to a POST query by an iPhone app.

Anyway, this method is checking for about 10 different conditions - any of which will result in an HTTP error being returned (I'm still considering this, but possibly a 400: bad request error).

My current syntax is basically this (paraphrased):

def invalid_submission_params?(params)
   [check one] or
   [check two] or
   [check three] or
   [check four] etc etc
end

Where each of the check statements returns true if that particular parameter check results in an invalid parameter set. I call it as a before filter with params[:submission] as the argument.

This seems a little ugly (all the strung together or statements). Is there a better way? I have tried using case but can't see a way to make it more elegant.

Or, perhaps, is there a rails method that lets me check the incoming params hash for certain conditions before handing control off to my action method?