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This repository was archived by the owner on Feb 23, 2026. It is now read-only.
assignments of dict list is not supported for repeated field #135
Description
How to reproduce:
- Clone https://github.com/googleapis/python-vision, switch to proto_issue branch, then install it locally.
- Run the following sample.
from google.cloud import vision_v1
import proto
import json
request = dict(image=vision_v1.Image(content=b"content"))
batch_req = vision_v1.BatchAnnotateImagesRequest()
# This works (converting the dict to AnnotateImageRequest first, then form a list)
# batch_req.requests = [vision_v1.AnnotateImageRequest(request)]
# This throws exception (assigning the list of dict directly)
batch_req.requests = [request]
The last line throws the following exceptions:
TypeError: Parameter to MergeFrom() must be instance of same class: expected google.cloud.vision.v1.Image got Image.
Activity
software-dov commentedon Apr 12, 2021
The workaround is to not assign repeated fields from lists of dicts.
The following should work:
Or to use the indirect method described in the issue text above.
Dropping priority to P3 since workarounds exist.
parthea commentedon Mar 16, 2023
I can no longer reproduce this issue. Please open a new issue if you're still experiencing the problem.