How can I add a virtual property to Model? and it can be set in controller.

[ghost]

I'm using fastapi and Tortoise ORM, I need add an no-database property to a model like this:

class Account(models.Model):
    id = fields.IntField(pk=True)
    email = fields.CharField(max_length=64)
    is_new = 0 # this is the abstract property will be set other value in service.

Account_Pydantic = pydantic_model_creator(Account, name="Account")

but this will not have property is_new in the schema, and when I generate open-api dart codes, it will come errors. Can anyone helps? Thanks a lot.

[vlakius]

I could be wrong, but I think it is currently not possible to do this as you would like to do it. As a workaround you could create a customised model with pydantic that contains the property you want in the schema

from tortoise import fields, models
from pydantic import BaseModel, ConfigDict, Field

class Account(models.Model):
    id = fields.IntField(pk=True)
    email = fields.CharField(max_length=64)

    def dict(self):
        return self.__dict__


class AccountWithIsNew(BaseModel):
    id: int
    email: str
    is_new: Optional[int] = Field(default=0)
    model_config = ConfigDict(from_attributes=True)

acc = await Account.create(email="test")

acc_with_is_new = AccountWithIsNew(**acc.dict())

print(acc_with_is_new)

ouput

id=1 email='test' is_new=0