Config

Learn model config with model_config.

Config

In Pydantic v2, model settings are made with model_config. It uses ConfigDict instead of the old class Config. Settings control strictness, extra fields, ORM mode and other behavior.

from pydantic import BaseModel, ConfigDict

class User(BaseModel):
    model_config = ConfigDict(str_min_length=1)
    name: str

str_min_length=1 applies a minimum length of 1 to all string fields. With extra="forbid" you reject unknown fields.

Common settings

extra="forbid" rejects unknown fields; extra="ignore" silently drops them. str_min_length and str_max_length apply to all string fields.

class User(BaseModel):
    model_config = ConfigDict(
        extra="forbid",
        str_min_length=1,
    )
    name: str

These settings are useful for strict behavior such as rejecting unexpected fields in APIs. ORM mode is also enabled here, so you can work with database models easily.

Exercise User model with ConfigDict

Start with from pydantic import BaseModel, ConfigDict. Define class User(BaseModel):. Add model_config = ConfigDict(str_min_length=2). Add field name: str. Create an instance with u = User(name="Ayşe"). Print the name with print(u.name).

Show example solution

from pydantic import BaseModel, ConfigDict

class User(BaseModel):
    model_config = ConfigDict(str_min_length=2)
    name: str

u = User(name="Ayşe")
print(u.name)

Test yourself

Which attribute holds model settings in Pydantic v2?
- settings
- class Config
- __config__
- model_config
Show answer

model_config — The model_config attribute holds settings in v2.

Complete the model_config assignment

from pydantic import BaseModel, ConfigDict

class User(BaseModel):
    ____ = ConfigDict(str_min_length=1)
    name: str

Show answer

from pydantic import BaseModel, ConfigDict

class User(BaseModel):
    model_config = ConfigDict(str_min_length=1)
    name: str

Match the Config concepts

model_config

Holds settings
ConfigDict

Creates a settings dict
extra='forbid'

Rejects unknown
str_min_length

String min length

Next lesson: parse_obj

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