}
	}

	AssertObjEqual(t, pet, expect, "ID", "CreatedAt", "UpdatedAt", "DeletedAt", "UserID", "Name")

	AssertObjEqual(t, pet.Toy, expect.Toy, "ID", "CreatedAt", "UpdatedAt", "DeletedAt", "Name", "OwnerID", "OwnerType")

	if expect.Toy.Name != "" && expect.Toy.OwnerType != "pets" {
		t.Errorf("toys's OwnerType, expect: %v, got %v", "pets", expect.Toy.OwnerType)
	}
}

		}
	case schema.Many2Many:
		joinModel := reflect.New(rel.JoinTable.ModelType).Interface()
		joinDB := base.Session(&Session{NewDB: true, Context: ctx}).Model(joinModel)

		// EXISTS owners: owners.pk = join.owner_fk for all owner refs
		ownersExists := base.Session(&Session{NewDB: true, Context: ctx}).Table(rel.Schema.Table).Select("1")
		for _, ref := range rel.References {
			if ref.OwnPrimaryKey && ref.PrimaryKey != nil {

For example, if you have an app like this:

```Python
from fastapi import FastAPI
from pydantic import BaseModel

class Item(BaseModel):
    name: str
    price: Optional[float] = None
    owner_ids: Optional[List[int]] = None

app = FastAPI()

@app.get("/items/invalidnone", response_model=Item)
def get_invalid_none():
    return None
```