Cannot convert proto.marshal.collections.maps.MapComposite to a Python dictionary

[wora]

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Summary of the issue

According to a few answers on internet, I am expecting to use MessageToDict() to conver proto.marshal.collections.maps.MapComposite into a Python dictionary, but failed with

AttributeError: 'MapComposite' object has no attribute 'DESCRIPTOR'

API client name and version

altgraph 0.17.2
cachetools 5.3.3
certifi 2024.6.2
charset-normalizer 3.3.2
future 0.18.2
google-api-core 2.19.1
google-auth 2.30.0
google-cloud-access-context-manager 0.2.0
google-cloud-asset 3.26.1
google-cloud-iam 2.15.0
google-cloud-org-policy 1.11.0
google-cloud-os-config 1.17.3
googleapis-common-protos 1.63.2
grpc-google-iam-v1 0.13.1
grpcio 1.64.1
grpcio-status 1.62.2
idna 3.7
macholib 1.15.2
pip 24.1.1
proto-plus 1.24.0
protobuf 4.25.3
pyasn1 0.6.0
pyasn1_modules 0.4.0
requests 2.32.3
rsa 4.9
setuptools 58.0.4
six 1.15.0
urllib3 2.2.2
wheel 0.37.0

Reproduction steps: code

file: main.py

from google.cloud import asset_v1
from google.cloud import iam_admin_v1
from google.protobuf.json_format import MessageToDict
import re

# Initialize clients
asset_client = asset_v1.AssetServiceClient()
iam_client = iam_admin_v1.IAMClient()

# Set environment variables
FOLDER = "<folder-id>"
NAME = "monitoring"

def query_service_accounts(folder, name):
    query = f"""
    SELECT
      [resource.data.name](http://resource.data.name/)
    FROM
      iam_googleapis_com_ServiceAccountKey
    WHERE
      [resource.data.name](http://resource.data.name/) LIKE "%/{name}%"
      AND resource.data.keyType = "USER_MANAGED"
    """
    response = asset_client.query_assets(
        request={
            "parent": f"folders/{folder}",
            "statement": query,
            "page_size": 500,
        }
    )
    o = response.query_result.rows[0]
    print ("FOO ", MessageToDict(o))
    return [asset["name"] for asset in response.query_result.rows]

def describe_service_account(project, account_id):
    service_account_name = f"projects/{project}/serviceAccounts/{account_id}"
    return iam_client.get_service_account(name=service_account_name)

def main():
    service_accounts = query_service_accounts(FOLDER, NAME)

    print(service_accounts)
   
    for service_account in service_accounts:
        match = re.match(r'projects/([^/]+)/serviceAccounts/(.*)', service_account)
        if match:
            project, account_id = match.groups()

            # Describe the service account
            description = describe_service_account(project, account_id)
            print(description)
              
if __name__ == "__main__":
    main()

Reproduction steps: supporting files

None. The above script is self contained, but it depends on Application Default Credentials.

Reproduction steps: actual results

AttributeError: 'MapComposite' object has no attribute 'DESCRIPTOR'

Reproduction steps: expected results

Get a python disctionary

OS & version + platform

MacOS 14.5

Python environment

3.9.6

Python dependencies

Not sure

[parthea]

MessageToDict is part of the Protobuf API, however the library uses proto-plus which is a wrapper around the Protobuf API. For proto-plus objects, you can use the .to_dict() method of proto-plus to convert the proto-plus object to a dictionary. See the documentation of proto-plus for more information. If you're still having trouble, please provide the full stack trace to understand the issue better.

Note: There is an open issue in proto-plus related to a missing to_dict() method for MapComposite fields. If you run into this issue, please try the working which is dict(<object>) as mentioned in googleapis/proto-plus-python#437.

[parthea]

I'm going to close this issue due to inactivity but please feel free to open a new issue with more information.