Swift Firestore Search for users

Question

I've had already implemented a function to search for users using the FirebaseDatabase like that:

REF_USERS.queryOrdered(byChild: "username_lowercase").queryEnding(atValue: text+"\u{f8ff}").queryLimited(toFirst: 25).queryStarting(atValue: text).observeSingleEvent(of: .value, with:
            {
                (snapshot) in
                snapshot.children.forEach(
                    {
                        (s) in
                        let child = s as! DataSnapshot
                        if let dict = child.value as? [String: Any]
                        {
                            let user = UserInfo.createUser(dict: dict, key: child.key)
                            if user.id! != currentUserId
                            {
                                completion(user)
                            }
                        }
                })
        })

But now I've decided to switch from the Database to Firestore and since they've been bragging about their great querying I figured it shouldn't be too hard but for a few days now I've been trying to figure out how to search for users and can't seem to get it done.

Thats the code I have so far:

REF_USERS.order(by: "username_lowercased").limit(to: 25).order(by: text).getDocuments
        {
            (snapshot, error) in
            snapshot?.documents.forEach(
                {
                    (s) in
                    let child = s

                    let user = UserInfo.createUser(dict: child.data(), key: child.documentID)
                    if user.id! != currentUserId
                    {
                        completion(user)
                    }
            })
        }

But like i said nothing really works.

Any suggestions? Id really appreciate it c:

-Marie

score 1 · Answer 1 · answered Nov 30 '18 at 18:21

1

First of all start by handling errors. Errors in Firestore are very descriptive and they will guide you what needs to be done in order for your query to work.

guard let snapshot = snapshot else {
    // Make your completion handler work with errors as well so you can read / display them
    // completion(nil, error)
    // For now just print the error
    print(error!)
    return
}

Also when you want to call a success completion handler when a condition is met, I suggest you just use a for loop and break when needed:

for document in snapshot.documents {
    if user.id! != currentUserId {
        completion(user)
        break
    }
}

I hope this helps.

answered Nov 30 '18 at 18:21

Vasil Garov

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Okay thank you but is it even possible to query based on a given string/text using firestore? – Marie.K Nov 30 '18 at 18:23
Yes, you can order by a string field in your document. So if you have a field called `username_lowercased` in your documents you should be able to order by it. – Vasil Garov Nov 30 '18 at 18:25
So I am doing it the right ways by saying `.order(by: "username_lowercased")` aswell as `.order(by: text)`? text is the text the user has typed – Marie.K Nov 30 '18 at 18:26
Do you have a `text` field as well? – Vasil Garov Nov 30 '18 at 18:28
But do you hold such field in your document? – Vasil Garov Nov 30 '18 at 18:29
oh sorry my bad. No I dont have a `text` field in my backend. Text is the ouput of a `textField` on one of my viewcontrollers. – Marie.K Nov 30 '18 at 18:30

Swift Firestore Search for users

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