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Home/ Questions/Q 7926695
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Editorial Team
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Editorial Team
Asked: June 3, 20262026-06-03T18:53:04+00:00 2026-06-03T18:53:04+00:00

How do you check if an embedded document exists for a document using mongoid

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How do you check if an embedded document exists for a document using mongoid in Ruby on Rails? Say I have a document user that has name, email, and might have a nicknames embedded document. Right now if I run user.first.nicknames and if that user doesn’t have the nicknames embedded document in it, it will error out. I’ve tried matches? and exists? but they don’t work.

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  1. Editorial Team
    Editorial Team
    2026-06-03T18:53:06+00:00Added an answer on June 3, 2026 at 6:53 pm

    This should return true if it doesn’t exist User.first.nicknames.nil? and this will return true if it does exist: User.first.nicknames.present?

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