How use by_alias argument in jsonable_encoder about fastapi HOT 4 CLOSED

from fastapi.encoders import jsonable_encoder
import json
from typing import List

from fastapi import FastAPI
from pydantic import BaseModel, Schema

import pytest
from starlette.testclient import TestClient
from starlette.responses import JSONResponse

app = FastAPI()


class Model(BaseModel):
    model_field: str = Schema(..., alias="modelField")

    class Config:
        allow_population_by_alias = True


@app.get("/models", response_model=List[Model])
def get_models():
    m = Model(model_field="string")
    content = jsonable_encoder([
        Model(model_field=m.model_field),
        Model(modelField=m.model_field),
        Model(**m.dict()),
        Model(**m.dict(by_alias=True)),
    ], by_alias=True)
    return JSONResponse(content=content)


@app.post("/models", response_model=Model)
def create_model(m: Model):
    content = jsonable_encoder(Model(**m.dict()), by_alias=True)
    return JSONResponse(content=content)


@pytest.fixture
def client():
    yield TestClient(app)


def test_get_models(client):
    with client:
        response = client.get("/models")
    assert response.json() == [{"modelField": "string"} for _ in range(4)]


def test_create_model(client):
    with client:
        response = client.post("/models", json.dumps({"modelField": "string"}))
    assert response.json() == {"modelField": "string"}