如何在Firestore中一次创建/更新多个文档

Question

是否可以仅使用一个请求在Firestore中存储多个文档？使用此循环可能但这会导致列表中的每个项目进行一次保存操作.

for (counter in counters) {
    val counterDocRef = FirebaseFirestore.getInstance()
            .document("users/${auth.currentUser!!.uid}/lists/${listId}/counters/${counter.id}")
    val counterData = mapOf(
            "name" to counter.name,
            "score" to counter.score,
    )
    counterDocRef.set(counterData)
}

Answer 1

来自Firebase文档:

您还可以使用set(),update()或delete()方法的任意组合作为单个批处理执行多个操作.您可以跨多个文档批量写入,批处理中的所有操作都以原子方式完成.

// Get a new write batch
WriteBatch batch = db.batch();

// Set the value of 'NYC'
DocumentReference nycRef = db.collection("cities").document("NYC");
batch.set(nycRef, new City());

// Update the population of 'SF'
DocumentReference sfRef = db.collection("cities").document("SF");
batch.update(sfRef, "population", 1000000L);

// Delete the city 'LA'
DocumentReference laRef = db.collection("cities").document("LA");
batch.delete(laRef);

// Commit the batch
batch.commit().addOnCompleteListener(new OnCompleteListener<Void>() {
    @Override
    public void onComplete(@NonNull Task<Void> task) {
        // ...
    }
});

Firestore多次写操作

希望能帮助到你..

Answer 2

更新集合中所有文档的一些属性：

resetScore(): Promise<void> {
  return this.usersCollectionRef.ref.get().then(resp => {
    console.log(resp.docs)
    let batch = this.afs.firestore.batch();

    resp.docs.forEach(userDocRef => {
      batch.update(userDocRef.ref, {'score': 0, 'leadsWithSalesWin': 0, 'leadsReported': 0});
    })
    batch.commit().catch(err => console.error(err));
  }).catch(error => console.error(error))
}