TypeError: Message must be initialized with a dict

[Tony Piazza]

My current task requires me to use the BigQuery Storage Write API. I have created a .proto file and was able to use protoc to generate a Python message class. I am seeing this exception when creating an instance of that class:

TypeError: Message must be initialized with a dict: combocurve.Measurement

File "/google/api_core/grpc_helpers.py", line 162, in error_remapped_callable

Here is my .proto file:

syntax = "proto2";

package combocurve;

import "google/protobuf/timestamp.proto";

import "google/type/date.proto";

message Measurement {

required string device_id = 1;

required google.type.Date last_service_date = 2;

optional double temperature = 3;

optional double pressure = 4;

optional google.protobuf.Timestamp created_at = 5;

}

Here is the code that is raising the exception:

measurement = Measurement(

device_id='ABC123',

last_service_date=date_pb2.Date(

year=last_service_date.year,

month=last_service_date.month,

day=last_service_date.day),

temperature=10.0,

pressure=20.0,

created_at=int(created_at.timestamp() * 1e6)

)

Please let me know if you have any ideas as to what is causing this exception.

Thanks in advance for your help!

-Tony

[Tony Piazza]

The problem had to do with the Date and Timestamp fields. The problem was solved by converting them to int64.

[Fred Douglis]

I found this thread when searching for the same message, but my solution was entirely different.  It turned out that I was trying to update a client to use a slightly modified proto file, and I was making a call that was assigning to a field that no longer existed.  But the error message here ( TypeError: Message must be initialized with a dict)   is completely misleading -- the real message should have been "unknown argument" or "unknown field" or something ....