Bug: Pydantic json_schema_extra fields aren't all merged

[provinzkraut]

Description

When defining schema overrides on a Pydantic model via json_schema_extra, not all of them are applied to the generated schema

MCVE

import pydantic

from litestar import Litestar, get


class Model(pydantic.BaseModel):
    with_title: str = pydantic.Field(title="WITH_title")
    with_extra_title: str = pydantic.Field(json_schema_extra={"title": "WITH_extra"})


@get("/example")
async def example_route() -> Model:
    return Model(with_title="1", with_extra_title="2")


app = Litestar([example_route])
schema = app.openapi_schema.to_schema()
props = schema["components"]["schemas"]["Model"]["properties"]

assert props["with_title"] == {"title": "WITH_title", "type": "string"}
assert props["with_extra_title"] == {"title": "WITH_extra", "type": "string"}

Litestar Version

2.11

Platform

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

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