How can I Check if String is in an Array in a specific Firestore document (Swift)?

Question

What I want to do: Check if a user is following another user. Basically I want to see if the UID of the user is in the "follower" array in the document of the other user-profile.

I thought of the option to use the .whereField command, but then I would get more documents and not only the one that I care of.

Vasil Garov · Accepted Answer · 2020-07-16 15:12:38Z

1

You can go with array-contains operator:

https://firebase.google.com/docs/firestore/query-data/queries#array_membership

So you can write something like this:

usersRef
    .whereField("followers", arrayContains: "l47GVBdjsabjdjds")

answered Jul 16, 2020 at 15:12

Vasil Garov

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Dharman · Accepted Answer · 2020-07-16 15:09:21Z

1

Get the user document (using whereField isEqualTo)and check if the followers field array contains the uid of the second user.

edited Jul 16, 2020 at 15:09

Dharman♦

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answered Jul 16, 2020 at 15:03

Luca Sfragara

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