Enhancement: Support configuring Pydantic's .model_validate(..., strict=True)

[Anu-cool-007]

Description

Any usage of Strict types has no effect on model validation in Litestar. This is due to the explicit strict=Fasle usage in the pydantic v2's validation method.

URL to code causing the issue

litestar/litestar/contrib/pydantic/pydantic_init_plugin.py

Line 51 in 65f01ea

return model_type.model_validate(value, strict=False)

MCVE

from litestar import Litestar, get
from pydantic import BaseModel, StrictBool


class TestModel(BaseModel):
  test_bool: StrictBool


@post("/")
async def test_strict_model(data: TestModel) -> str:
 return "Hello, world!"


app = Litestar([hello_world])

Steps to reproduce

1. Run the attached MCVE
2. Send a POST req to the server with the following data

{
  "test_bool" : "YES"
}

3. You will receive a success response instead of an error.

Screenshots

"![SCREENSHOT_DESCRIPTION](SCREENSHOT_LINK.png)"

Logs

No response

Litestar Version

2.9.0
But this is a day 0 bug with Pydantic v2 support afiak.

Platform

• Linux
• Mac
• Windows
• Other (Please specify in the description above)

---

Note

While we are open for sponsoring on GitHub Sponsors and
OpenCollective, we also utilize Polar.sh to engage in pledge-based sponsorship.

Check out all issues funded or available for funding on our Polar.sh dashboard

• If you would like to see an issue prioritized, make a pledge towards it!
• We receive the pledge once the issue is completed & verified
• This, along with engagement in the community, helps us know which features are a priority to our users.

[provinzkraut]

Hey @Anu-cool-007, thanks for reporting this!

Although not really a bug, it makes sense to make this configurable on the Plugin. I've converted it into a feature request :)

[provinzkraut]

Hey @Anu-cool-007, I've created #3573, which should address this.

With that, you can do this to get the behaviour you want:

from litestar import Litestar, get
from litestar.contrib.pydantic import PydanticInitPlugin
from pydantic import BaseModel, StrictBool


class TestModel(BaseModel):
  test_bool: StrictBool


@post("/")
async def test_strict_model(data: TestModel) -> str:
 return "Hello, world!"


app = Litestar(
    [hello_world],
    plugins=[PydanticInitPlugin(validate_strict=True)]
)

[github-actions]

A fix for this issue has been released in v2.14.0