First Check

• I added a very descriptive title here.
• I used the GitHub search to find a similar question and didn't find it.
• I searched the FastAPI documentation, with the integrated search.
• I already searched in Google "How to X in FastAPI" and didn't find any information.
• I already read and followed all the tutorial in the docs and didn't find an answer.
• I already checked if it is not related to FastAPI but to Pydantic.
• I already checked if it is not related to FastAPI but to Swagger UI.
• I already checked if it is not related to FastAPI but to ReDoc.

Commit to Help

• I commit to help with one of those options 👆

Example Code

from fastapi import FastAPI
from pydantic import BaseModel

class Item(BaseModel):
  name: str 
  description: str | None = None 
  price: float 
  tax: float | None = None

app = FastAPI()

@app.post("/items/")
async def create_item(item: Item):
    item_dict = item.dict()
    if item.tax is not None:
        price_with_tax = item.price + item.tax
        item_dict.update({"price_with_tax": price_with_tax})
    return item_dict

Description

IDE
VSCode

SETUP
Have these settings in your vscode:
"python.languageServer": "Pylance",
"python.analysis.typeCheckingMode": "strict"

DESCRIPTION
I was just reading through the User Guide in the documentation, once I was at the request body part, the code snippet used .dict() on the item from the request body, then a red squiggly line appears under .dict() saying it's deprecated and that model_dump() should be used instead (refer to attached photo).

This isn't really a breaking bug as my code still runs, and this is only appearing because I have strict mode on, but is it a good idea to update the docs according to this? if so, I would like to take a crack at it :)

Operating System

Windows

Operating System Details

Windows 11

FastAPI Version

0.116.1

Pydantic Version

2.11.7

Python Version

3.11.4

Additional Context

No response