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Asked: 2026-06-01T03:41:43+00:00

I have Car (table cars ) method that has_many owners (table owners ). How

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I have Car (table cars) method that has_many owners (table owners). How can I choose all cars, that has no owners (== in the table owners is no one row with respective car’s ID)?

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1 Answer

  1. Editorial Team

    I would do it as per below in the model….

    @cars_without_owners = Car.where("owner_id = ?", nil)

    or to be safe….

    @cars_without_owners = Car.where("owner_id = ? OR owner_id = ?", nil, "")
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