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?
Many, many, many TIA if you tackle this one :)
Craig
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