nested schema not working on many to many fields about django-ninja HOT 3 CLOSED

here music_genre is manytomanyfield on user

class UserSchema(Schema):
id: int
name: str

class UserOut(Schema):
id: int
username: str
about: str
music_genre: UserSchema

result = self.response_model(response=result).dict()["response"]

File "pydantic/main.py", line 346, in pydantic.main.BaseModel.init
pydantic.error_wrappers.ValidationError: 2 validation errors for Response
response -> music_genre -> id
field required (type=value_error.missing)
response -> music_genre -> name
none is not an allowed value (type=type_error.none.not_allowed)

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@bugiebhavya

not sure if I understand this correctly - but here is my guess:

you have the following models structure:

class MusicGenre(models.Model):
       name = models.CharField(...)


class User(models.Model):
      username = models.CharField(...)
      about = models.CharField(...)
      music_genre = models.ManyToManyField(MusicGenre) # <--m2m !!!!!!

Now to return a user with list of genres:

from typing import List

class MusicGenreSchema(Schema):
    id: int
    name: str

class UserOut(Schema):
    id: int
    username: str
    about: str
    music_genre: List[MusicGenreSchema]  # <-- typing.List !!!!!

@api.post("/foo", response=UserOut)
def some_operation(request, ...):
       user = ... get from db ...
       user.music_genre = list(user.music_genre.all())  # evaluate m2m queryset to list
       return user
  

yeah, it's a bit uncomfortable at the moment, but there are plans to allow to attach m2m fields directly to schemas

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hey @bugiebhavya, let me know if it worked for you

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