Environment details

• OS type and version: Debian Buster
• Python version: Python 3.7.3
• pip version: pip 18.1 from /usr/lib/python3/dist-packages/pip (python 3.7)
• google-cloud-storage version: 1.35.1

Steps to reproduce

1. Create a blob.
2. Set custom_time.
3. Upload the blob .
4. Try to retrieve blob's custom_time.
5. Expected result is a datatime, but the actual result is None.

If blob's custom_time is set before uploading, it is just lost. My understanding is that the metadata could be uploaded with the object's content at the same time without needing to patch it afterwards.

https://cloud.google.com/storage/docs/uploading-objects#rest-upload-objects

Code example

import datetime
from google.cloud import storage

bucket_name = "my-test-bucket"
blob_name = "test_blob"

client = storage.Client()
bucket = client.get_bucket(bucket_name)

blob = bucket.blob(blob_name)
blob.custom_time = datetime.datetime.now(datetime.timezone.utc)
print("Before upload {}".format(blob.custom_time))
blob.upload_from_string("test")
blob.reload()
print("After upload {}".format(blob.custom_time))
blob.custom_time = datetime.datetime.now(datetime.timezone.utc)
blob.patch()
blob.reload()
print("After patching {}".format(blob.custom_time))

Stack trace

Before upload 2021-02-05 10:24:08.405494+00:00
After upload None
After patching 2021-02-05 10:24:08.814159+00:00