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  • I think you don't really understand what I'm trying to do. I updated my post to give more details about what I'm doing concretely. Commented Apr 29, 2015 at 14:16
  • How is your database build? I don't see why checking for the uniqueness of the id of the item is no valid, based on what you wrote. Rails has ways to make that kind of query to the database. You don't need to pass a controller attribute to the model. Commented Apr 29, 2015 at 14:25
  • I just want to check if the id of the selected item chosen in the form exists in the array coming from the API. There is nothing about uniqueness. Commented Apr 29, 2015 at 14:29
  • You are right. There is nothing about uniqueness. Commented Apr 29, 2015 at 14:34