Validating throwaway forms not related to a model

I have a fo开发者_Python百科rm which takes in data, but it is not stored in any model. Instead, it is used to perform calculations and modify a model. Is there any way I can validate the data on the form (for example, forcing certain inputs to be of integer form) within rails, and without writing it manually in javascript?

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Because of the rails mantra of "keep your controllers skinny", you should put your validations in your models. However you are stating that this data isn't backed by a database. This is ok, since you can create objects that act like a model(which means you can still have the activerecord validations in there).

I would highly suggest reading Yehuda Katz's post on ActiveModel: Make Any Ruby Object Feel Like ActiveRecord. From there you can use the ActiveRecord validations that you've been used to!