Display custom attributes

If you need to display a custom attribute of your model, or a calculated attribute or property which is not direclty from the database, it is possible out of the box with SQLAdmin-NG.

Let's see an example model:

```py class User(Base): tablename = "user"

id = mapped_column(Integer, primary_key=True)
first_name = mapped_column(String)
last_name = mapped_column(String)

@property
def full_name(self) -> str:
    return f"{self.first_name} {self.last_name}"

```

And in order to for example show the full_name property in the admin, you can just use the full_name just like other string model properties.

For example:

py class UserAdmin(ModelView, model=User): column_list = [User.id, "full_name"] column_details_list = [User.id, "full_name"]