[BUG] OpenAPI schema generator error with ManyToMany UUID

[jam13]

Describe the bug
I have a Project model with a many_to_many relationship to User called user. Both models use UUID as pk.

Created a schema like this:

class ProjectOut(ModelSchema):
    class Config:
        model = Project
        model_fields = "__all__"

and an endpoint like this:

@api.get("/projects", response=List[ProjectOut])
def list_projects(request):
    return get_list_or_404(Project, user=request.user)

This seems to work as expected, with a list of UUID strings returned for user. However when trying to load the OpenAPI docs I get an error in the brower and log output:

...
  File "/opt/venv/lib/python3.11/site-packages/ninja/orm/fields.py", line 88, in __get_pydantic_json_schema__
    json_type = {
                ^
KeyError: <class 'uuid.UUID'>

If I exclude the user field, then OpenAPI is fine, and I can return the list of UUIDs by using resolve:

user: List[UUID]
@staticmethod
def resolve_user(obj):
    return [str(u.id) for u in obj.user.all()]

Versions (please complete the following information):

• Python version: 3.11
• Django version: 4.2
• Django-Ninja version: 1.0b2
• Pydantic version: 2.4

[nickmccullum]

I am experiencing this as well, any thoughts on when this could be patched?

[gokaykucuk]

A simple addition of UUID type to ninja/orm/fields.py seems like working for me atm. But I haven't tested anything properly.

    json_type = {
        int: "integer",
        str: "string",
        float: "number",
        UUID: "string",
    }[type_]