Files
fastapi/tests/test_datetime_custom_encoder.py
Sebastián Ramírez e2cd8a4201 Drop support for Pydantic v1, keeping short temporary support for Pydantic v2's pydantic.v1 (#14575)
Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
2025-12-20 16:55:38 +01:00

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Python

from datetime import datetime, timezone
from fastapi import FastAPI
from fastapi.testclient import TestClient
from pydantic import BaseModel
from .utils import needs_pydanticv1
def test_pydanticv2():
from pydantic import field_serializer
class ModelWithDatetimeField(BaseModel):
dt_field: datetime
@field_serializer("dt_field")
def serialize_datetime(self, dt_field: datetime):
return dt_field.replace(microsecond=0, tzinfo=timezone.utc).isoformat()
app = FastAPI()
model = ModelWithDatetimeField(dt_field=datetime(2019, 1, 1, 8))
@app.get("/model", response_model=ModelWithDatetimeField)
def get_model():
return model
client = TestClient(app)
with client:
response = client.get("/model")
assert response.json() == {"dt_field": "2019-01-01T08:00:00+00:00"}
# TODO: remove when deprecating Pydantic v1
@needs_pydanticv1
def test_pydanticv1():
from pydantic import v1
class ModelWithDatetimeField(v1.BaseModel):
dt_field: datetime
class Config:
json_encoders = {
datetime: lambda dt: dt.replace(
microsecond=0, tzinfo=timezone.utc
).isoformat()
}
app = FastAPI()
model = ModelWithDatetimeField(dt_field=datetime(2019, 1, 1, 8))
@app.get("/model", response_model=ModelWithDatetimeField)
def get_model():
return model
client = TestClient(app)
with client:
response = client.get("/model")
assert response.json() == {"dt_field": "2019-01-01T08:00:00+00:00"}