[Rails] Re: Validation problem

RichardOnRails wrote:
> Hi All,
>
> I've got an Expense model as follows:
>
> class Expense < ActiveRecord::Base
> belongs_to :vendor
>
> def validate_on_create
> unless params["expense"]["vendor_id"] != "0" # <= Line 5
> errors.add("A vendor must be selected before creating the
> expense record")
> end
> end
> end
>
> that crashes with:
>
> undefined local variable or method `params' for #<Expense:0x4716c00>
> [snip]

Your model by itself knows nothing about params received in the
controller. And by the time you're looking at validate_on_create, the
attributes from params have been assigned to the model, IIRC.

What about simply

def validate_on_create
unless vendor_id != 0
errors.add(blah blah blah)
end
end
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