Incorrect response with nested Pydantic models

First Check

• I added a very descriptive title to this issue.
• I used the GitHub search to find a similar issue 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, UploadFile
from datetime import datetime
from typing import List
from pydantic import BaseModel, Field


app = FastAPI()


class BoundingBox(BaseModel):
    x1: int
    y1: int
    x2: int
    y2: int

class ImageMeta(BaseModel):
    timestamp: datetime
    bounding_boxes: List[BoundingBox]

    class Config:
        orm_mode = True

@app.post('/fetch_image')
def fetch_image(content: UploadFile, metadata: ImageMeta):
    return {
        'filename': content.filename,
        'timestamp': metadata.timestamp.isoformat(timespec='seconds'),
        'bounding_boxes': metadata.bounding_boxes
    }

Description

The Pydantic models are stated in example code, and this is the request body as shown below:

But receive the following response, stated that the field timestamp is missing. For elimating this issue, I’ve done with following attempts:

• Reduce the field timestamp and only field bounding_boxes: got the same response stated that the field bounding_boxes is missing.
• Cancelled out orm_mode: No changes.
• Assign the default value for timestamp and bounding_boxes: the value of fields will always be default, never be modified by the incoming request.

I’m struggling with this situation for few hours and still seeking for the issue. Does anyone confront the same issue?

Operating System

Windows

Operating System Details

No response

FastAPI Version

0.75.0

Python Version

3.10.1

Additional Context

No response

[dotX12]

@Pandede, Above solution 😃

[dotX12]

https://github.com/dotX12/pyfa-converter

from datetime import datetime
from typing import Optional

from fastapi import FastAPI, UploadFile, File, Form
from pydantic import BaseModel, Field

from pyfa_converter import FormDepends, PyFaDepends

app = FastAPI()


class PostContractBodySchema(BaseModel):
    title: str = Field(..., description="Description title")
    date: Optional[datetime] = Field(
        None, description="Example: 2021-12-14T09:56:31.056Z"
    )


@app.post("/form-data-body")
async def example_foo_body_handler(
    data: PostContractBodySchema = FormDepends(PostContractBodySchema),
    # data1: PostContractBodySchema = PyFaDepends( # OR
    #         model= PostContractBodySchema, _type=Form
    #     ),
    document: UploadFile = File(...),
):
    return {"title": data.title, "date": data.date, "file_name": document.filename}