[Python] How to exclude Optional unset values from a Pydantic model using FastAPI?

I have this model:

class Text(BaseModel):
id: str
text: str = None


class TextsRequest(BaseModel):
data: list[Text]
n_processes: Union[int, None]


So, I want to be able to take requests like:

{"data": ["id": "1", "text": "The text 1"], "n_processes": 8}


and

{"data": ["id": "1", "text": "The text 1"]}.


Right now, in the second case I get:

{'data': [{'id': '1', 'text': 'The text 1'}], 'n_processes': None}


using this code:

app = FastAPI()

@app.post("/make_post/", response_model_exclude_none=True)
async def create_graph(request: TextsRequest):
input_data = jsonable_encoder(request)


So how can I exclude n_processes here?

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