Sometimes I pass values from a form to its associated action by assigning that value to hidden field in the form. The intention is to use the passed value to modify the behavior of the action. So, it's sort of a configuration option for the action. Sometimes I want to insist that a particular hidden field be present and/or insist that its value meet some criteria. If it doesn't, I want to produce an error message. I notice that Rails has its own excellent error messaging system. I'm wondering whether this is something I should try to tap into or should I attempt to create my own? Any guiding comments would be appreciated. Thanks in advance.
... doug