如何在 Swift 的 Firebase Firestore 中获取当前文档 ID？

Question

I have these two document IDs (I am going to have more in the future)

In some part of my code when the user taps on a Table View Cell, I am updating my Firebase using this code:

let dbCollection = K.FStore.db.collection(K.FStore.User.UsersCollectionName).document("EMSce9qnfNnPmn8JBobn")
if let textFieldText = textField.text {
    dbCollection.updateData([
        self.userDataInsideTableViewKeysArray[indexPath.row] as! String : textFieldText
    ]){ err in
        if let err = err {
            print("Error updating document: \(err)")

        } else {
            print("Document successfully updated")
        }
    }
}

I have an app that when the user registers with the email and password authentication function provided by firebase, I create a db collection with that unique email alongside some other data (gender, age, phone number...) The document ID is randomly generated, I can get access to all documentsID if I loop between them, however I want the document ID of this specific one so I can update it, I want to replace document("EMSce9qnfNnPmn8JBobn") with document(documentID) for that I have multiple users

Answer 1

I'm not sure I understand correctly, but if you want to get the document for the currently logged in user, that'd be:

K.FStore.db.collection(K.FStore.User.UsersCollectionName).document(Auth.auth().currentUser.uid)

Also see the documentation on getting the currently signed-in user .

---

Update

It seems that you have added your user profile documents with the addDocument calls, which means the IDs are unrelated to the user. In that case, you'll need to know something inside the document that uniquely identifies which document to update.

Since you say your email addresses are unique, and stored in the documents, you can use a query to find the matching document(s), and then loop and update each of them:

db.collection("cities").whereField("capital", isEqualTo: true)
    .getDocuments() { (querySnapshot, err) in
        if let err = err {
            print("Error getting documents: \(err)")
        } else {
            for document in querySnapshot!.documents {
                document.ref.updateData([
                    "fieldToUpdate": "newValue"
                ])
            }
        }
}

---

If you have a collection of user data, where each document belong to a specific user, and each user can only have a single document, it is idiomatic to use the UID as the document ID. To create a document with the UID as the document ID, see the first example in the documentation on setting a document .

If you use this data structure, you won't need a query to find the profile document for a user, and can instead use the statement at the top to determine what document to update.