In proto3 message fields (such as the "book" field in this case) do have
field presence. You are not supposed to check it with None though, because
if the field is not present, getters are supports to return a default
instance. There is another HasField() method to be used to check whether
the field is present or not. Try:
resp.HasField("book") # should be false if the server returns an empty
response.
See:
https://developers.google.com/protocol-buffers/docs/reference/python-generated#embedded_message
On Thu, Nov 24, 2016 at 4:28 PM, Jesús García Crespo <[email protected]>
wrote:
> Hi again,
>
> On Wed, Nov 23, 2016 at 6:24 PM, Nathaniel Manista <[email protected]>
> wrote:
>
>> possibly a oneof
>> <https://developers.google.com/protocol-buffers/docs/proto#using-oneof> that
>> can communicate exactly one of the id of a found book or the fact that the
>> book was not found.
>
>
> This makes sense to me, I'll give it a shot!
>
>
>> resp = self.stub.BookGet(library_pb2.BookGetRequest(id='12345'))
>>>
>> resp is None # False
>>> resp.book is None # False
>>> resp.book.id is None # False
>>> resp.book.id == '' # True
>>>
>>> So I could only make use of the last assertion but that seems far from
>>> ideal, right?
>>>
>>
>> I think this has to do with the changes in Protocol Buffers 3 and how
>> fields and messages are never "not present" any more.
>>
>
> Ok, I'm glad to know that was conscious choice and not a bug in my code :)
>
> Thank you so much,
>
> --
> Jesús García Crespo
>
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