How sqlmodel implements the same functionality as SerializerMethodField in DRF?

[rubbish822]

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Example Code

from rest_framework import serializers
from drf_spectacular.utils import extend_schema_field


class UserSerializer(serializers.ModelSerializer):
    full_name = serializers.SerializerMethodField(read_only=True)
    
    @extend_schema_field(serializers.CharField)
    def full_name(self, obj):
        return f'{obj.first_name}:{obj.id}'

### Description

from rest_framework import serializers
from drf_spectacular.utils import extend_schema_field

class UserSerializer(serializers.ModelSerializer):
full_name = serializers.SerializerMethodField(read_only=True)

@extend_schema_field(serializers.CharField)
def full_name(self, obj):
    return f'{obj.first_name}:{obj.id}'

### Operating System

macOS

### Operating System Details

_No response_

### SQLModel Version

0.0.14

### Python Version

Python 3.11.1

### Additional Context

_No response_

[YuriiMotov]

In SQLMOdel you would use computed_field:

from pydantic import computed_field
from sqlmodel import Field, Session, SQLModel, create_engine


class UserBase(SQLModel):
    id: int | None = Field(default=None, primary_key=True)
    first_name: str

class User(UserBase, table=True):
    pass

class UserRead(UserBase):
    @computed_field
    @property
    def full_name(self) -> str:
        return f"{self.first_name}:{self.id}"


sqlite_url = "sqlite:///"

engine = create_engine(sqlite_url)
SQLModel.metadata.create_all(engine)


with Session(engine) as session:
    user = User(first_name="John")
    session.add(user)
    session.commit()

    user_read = UserRead.model_validate(user)
    assert user_read.full_name == "John:1"