Question

在我尝试在/ users /上查找用户文档进行身份验证后，我想使用来自auth对象的数据以及一些自定义用户属性来更新文档。但我收到更新方法不存在的错误。有没有办法更新单个文档？所有firestore doc示例都假设您拥有实际的文档ID，并且他们没有任何使用where子句查询的示例。

firebase.firestore().collection("users").where("uid", "==", payload.uid)
  .get()
  .then(function(querySnapshot) {
      querySnapshot.forEach(function(doc) {
          console.log(doc.id, " => ", doc.data());
          doc.update({foo: "bar"})
      });
 })

Answer 1

检查用户是否已经在那里，然后只是.update，或.set，如果不是：

    var docRef = firebase.firestore().collection("users").doc(firebase.auth().currentUser.uid);
    var o = {};
    docRef.get().then(function(thisDoc) {
        if (thisDoc.exists) {
            //user is already there, write only last login
            o.lastLoginDate = Date.now();
            docRef.update(o);
        }
        else {
            //new user
            o.displayName = firebase.auth().currentUser.displayName;
            o.accountCreatedDate = Date.now();
            o.lastLoginDate = Date.now();
            // Send it
            docRef.set(o);
        }
        toast("Welcome " + firebase.auth().currentUser.displayName);
    });
}).catch(function(error) {
    toast(error.message);
});

Answer 2

您可以从doc.id：

构建文档参考

var db = firebase.firestore();

db.collection("users").where("uid", "==", payload.uid)
  .get()
  .then(function(querySnapshot) {
      querySnapshot.forEach(function(doc) {
          console.log(doc.id, " => ", doc.data());
          // Build doc ref from doc.id
          db.collection("users").doc(doc.id).update({foo: "bar"});
      });
 })

Answer 3

在原始代码中更改此行

doc.update({foo: "bar"})

对此

doc.ref.update({foo: "bar"})

应该工作

，但是更好的方法是使用批量写入： https://firebase.google.com/docs/firestore/manage-data/transactions#batched-writes

Answer 4

你只需要找到文件的官方ID，代码在这里！

    enter code here
    //Get user mail (logined)
    val db = FirebaseFirestore.getInstance()
    val user = Firebase.auth.currentUser
    val mail = user?.email.toString()

       //do update
       val update = db.collection("spending").addSnapshotListener { snapshot, e ->
                val doc = snapshot?.documents
                doc?.forEach {
                    //Assign data that I got from document (I neet to declare dataclass) 
                    val spendData= it.toObject(SpendDt::class.java)
                    if (spendData?.mail == mail) {
                        //Get document ID
                        val userId = it.id
                        //Select collection
                        val sfDocRef = db.collection("spendDocument").document(userId)
                        //Do transaction
                        db.runTransaction { transaction ->
                            val despesaConsum = hashMapOf(
                                "medalHalfYear" to true,
                            )
                            //SetOption.merege() is for an existing document
                            transaction.set(sfDocRef, despesaConsum, SetOptions.merge())
                        }
                    }

                }
            }
}
data class SpendDt(
    var oilMoney: Map<String, Double> = mapOf(),
    var mail: String = "",
    var medalHalfYear: Boolean = false
)

如何更新单个firebase firestore文档

4 个答案: