On Sep 26, 12:14 am, Dudebot <craign...@gmail.com> wrote:
> I want to write a validate routine to check to enforce that a position
> must be unique in a category. (In another category, it doesn't have
> to and shouldn't need to be unique.) I write this code which works
> happily for new items:
>
> def position_in_category_not_unique
> @items = Item.find( :all, :conditions => [ "category_id = ? AND
> position = ?", category_id, position ] )
> if @items.size > 0
> errors.add_to_base...
>
> If, however, I try to *update* an existing item, because it's already
> in the database, it gives the error.
>
> Any suggestions on how to approach this? It's a conceptual question.
> Do I handle this through the controller somehow?
>
You could add a condition along the lines of AND id != self.id. Or
you could use validates_uniqueness of, which already handles this.
Fred
> Many, many, many TIA if you tackle this one :)
> Craig
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