What type int must I use?

[tonioo]

I have a field represented by a SerializerMethodField which returns a list of string. I have tried different things to indicate the type (using the @extend_schema and a type hint) but I always receive the same warning:

Warning #0: type hint for function "get_domains" is unknown. consider using a type hint or @extend_schema_field. defaulting to string.

Any help appreciated :)

[tfranzel]

hi @tonioo, so the type hint support is currently very minimal (basic py types & Optional[]). so no lists/dicts supported yet. i suppose #198 suffers from the same problem. this feature is simply not complete yet. let me provide a patch to extend the support. i will have a look there.

[tfranzel]

i overlooked that you used @extend_schema, which is not applicable here. it is for views, view methods but not serializer methods. the correct decorator would be @extend_schema_field, just as the warning says. 😄 have a look at those examples:

https://github.com/tfranzel/drf-spectacular/blob/master/tests/test_extend_schema.py#L55

but the type hints needed work anyway. with this fix, type hint resolution covers a lot more cases now including dict, list, tuple, and so on.

[tfranzel]

@tonioo can you confirm the fix solves your issue?

[tonioo]

@tfranzel I confirm it works now, the type hint is correctly recognized!