尝试使用 ArrayUnion 时，Fire 给出“TypeError: Expected a message object, but getting field_path”错误

Question

我正在尝试将 firebase 与 python 一起使用。我已经连接到数据库并在方案中如下：

import firebase_admin
from firebase_admin import credentials, db, firestore

# Initialize connection to firebase
cred = credentials.Certificate("serviceAccountKey.json")
app_options = {
    'databaseURL': '...'}
firebase_admin.initialize_app(cred)
db = firestore.client()

目前数据库有两种类型的文档，当我们将它们转换为字典时，我们得到以下内容：

Admin: {'users': [], 'email': '...', 'first_name': '...', 'last_name': '...'}
User: {'email': '...', 'onboarding_form': 'first_name': '...', 'last_name': '...'}

我想将用户的引用添加到用户数组中，该数组是管理字段。为此，我有以下代码：

    user_id = get_user_id(user_last_name, user_first_name)
    admin_id = get_admin_id(admin_last_name, admin_first_name)

    user_ref = db.collection(u'user').document(user_id)
    admin_ref = db.collection(u'admin').document(admin_id)

    admin_ref.update(
        {u'users': firestore.ArrayUnion([user_ref])})

但代码不会插入对用户数组的引用。我收到以下错误：

Traceback (most recent call last):
  File "/home/primrose/work/BE/db_api.py", line 109, in <module>
    test_run()
  File "/home/primrose/work/BE/db_api.py", line 106, in test_run
    add_user("...", "...", "...", "...")
  File "/home/primrose/work/BE/db_api.py", line 98, in add_user
    admin_ref.update(
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/document.py", line 324, in update
    batch, kwargs = self._prep_update(field_updates, option, retry, timeout)
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/base_document.py", line 239, in _prep_update
    batch.update(self, field_updates, option=option)
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/base_batch.py", line 141, in update
    write_pbs = _helpers.pbs_for_update(
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/_helpers.py", line 941, in pbs_for_update
    update_pb.update_transforms.extend(field_transform_pbs)
TypeError: Expected a message object, but got field_path: "users"
append_missing_elements {
  values {
    reference_value: ".../databases/(default)/documents/user/hlCcG1oFW4Z75JKqp1ZcfM8xWlh1"
  }
}
.

我必须省略名称和引用值的开头，因此它们是“...”。我不明白该错误，什么可能导致该错误？提供字段路径不应该是正确的吗？

当我尝试获取管理员的信息时，我得到以下信息：

Traceback (most recent call last):
  File "/home/primrose/work/BE/db_api.py", line 109, in <module>
    test_run()
  File "/home/primrose/work/BE/db_api.py", line 106, in test_run
    add_user("...", "...", "...", "...")
  File "/home/primrose/work/BE/db_api.py", line 98, in add_user
    admin_ref.update(
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/document.py", line 324, in update
    batch, kwargs = self._prep_update(field_updates, option, retry, timeout)
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/base_document.py", line 239, in _prep_update
    batch.update(self, field_updates, option=option)
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/base_batch.py", line 141, in update
    write_pbs = _helpers.pbs_for_update(
  File "/home/primrose/.local/lib/python3.10/site-packages/google/cloud/firestore_v1/_helpers.py", line 941, in pbs_for_update
    update_pb.update_transforms.extend(field_transform_pbs)
TypeError: Expected a message object, but got field_path: "users"
append_missing_elements {
  values {
    reference_value: ".../databases/(default)/documents/user/hlCcG1oFW4Z75JKqp1ZcfM8xWlh1"
  }
}
.

使用的 firebase_admin 和 protovuf 版本是：

Name: firebase-admin
Version: 5.2.0

Name: protobuf
Version: 4.21.2

user_ref（编辑前的前 Physio_ref，该名称不应该出现在问题中）。我想要添加到名为“users”的数组中的数据是对另一个用户的引用。

Answer 1

使用最新版本的protobuf. 正如@Cherry Toska 所证实的，降级protobuf可以3.20.1解决该问题。

pip3 install protobuf==3.20.1