Hi In my web application, a table must have only one record. So when there is no record, user can add a new row to the table, (a add link is shown) and when a record is already available, user can't add a new one, he can just edit or destroy it( after destroying the current one, no more records exist, so he can add a new one). But I don't know how to check a table for emptiness. The other problem is when there is one record in table, how can I have a link to its show action(made by scaffolding), while i don't know the id. Because if the user destroy the record, its id is not 1 any more.
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