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Home/ Questions/Q 6133675
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Editorial Team
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Editorial Team
Asked: May 23, 20262026-05-23T17:15:34+00:00 2026-05-23T17:15:34+00:00

I have a model called book. I want to be able to check if

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I have a model called book. I want to be able to check if it has a book with the id of some number. It’s a simple question, and I’m just learning. Don’t be too harsh….

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  1. Editorial Team
    Editorial Team
    2026-05-23T17:15:34+00:00Added an answer on May 23, 2026 at 5:15 pm

    Well, it’s simply:

    Book.find_by_id(your_id)
    

    It will render an object or nil.

    Don’t use Book.find(your_id), because it raises an exception if no book has the expected id.

    I strongly advise you to check http://railsforzombies.org to learn Rails.

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