CODEWITHSUNDEEP
ruby-on-railsmongoid
Goalie
Goalie

Reputation: 3105

How do you check if an embedded document exists in a document in mongoid?

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.

Thanks!

Upvotes: 7

Views: 5401

Answers (4)

SteveO7
SteveO7

Reputation: 2460

With a little help from the other answers here, I found something that worked for me and I think this is what the original poster had in mind;

Model.where(:"subdoc.some_attribute".exists => true)

This will return all documents where the "some_attribute" exists on the subdocument. Notice the syntax of the symbol, that's what I was missing.

Upvotes: 14

Tonez
Tonez

Reputation: 319

You can do User.where(:nicknames.exists => true).include?(user).

User.where(:nicknames.exists => true) will return only the documents which contain nicknames.

Upvotes: 2

Chris Cherry
Chris Cherry

Reputation: 28574

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?

Upvotes: 3

Rob
Rob

Reputation: 12872

should be as simple as {"user":{"$exists":"nicknames"}}

Upvotes: 0

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