How to validate an outside form field in a Ruby on Rails form (such as a captcha)?

What you can do is add a virtual attribute. Check out this screencast from RailsCasts Basically you want to add an attribute to your class. Because you don't have to perform any logic with it you can just use the built Ruby method form instance variables class Foo Add(:humanproof, "is not the right answer") if humanproof!

= 4 end This adds an attribute to your class that is not saved to the database and is attached to the object for the duration of the request.

What you can do is add a virtual attribute. Check out this screencast from RailsCasts. Basically you want to add an attribute to your class.

Because you don't have to perform any logic with it you can just use the built Ruby method form instance variables. Class Foo = 4 end This adds an attribute to your class that is not saved to the database and is attached to the object for the duration of the request.

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