Issue 1:
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 pydantic import BaseModel
from fastapi import FastAPI

from typing import Tuple

class FooModel(BaseModel):
prop: Tuple[int, str]

app = FastAPI()

@app.get('/', response_model=FooModel)
def get_foo():
return {"prop": (0, 'ok')}

print(app.openapi())

Description

Summary

The above code must be failed with a ValidationError like this:

Traceback (most recent call last):
File "<pyshell#3>", line 1, in <module>
a()
File "<pyshell#1>", line 17, in a
print(app.openapi())
File "/usr/local/lib/python39/lib/site-packages/fastapi/applications.py", line 136, in openapi
self.openapi_schema = get_openapi(
File "/usr/local/lib/python39/lib/site-packages/fastapi/openapi/utils.py", line 410, in get_openapi
return jsonable_encoder(OpenAPI(**output), by_alias=True, exclude_none=True) # type: ignore
File "pydantic/main.py", line 406, in pydantic.main.BaseModel.__init__
pydantic.error_wrappers.ValidationError: 2 validation errors for OpenAPI
components -> schemas -> FooModel -> properties -> prop -> items
value is not a valid dict (type=type_error.dict)
components -> schemas -> FooModel -> $ref
field required (type=value_error.missing)

in fastapi.openapi.models in line 103~142

class Schema(BaseModel):
ref: Optional[str] = Field(None, alias="$ref")
title: Optional[str] = None
multipleOf: Optional[float] = None
maximum: Optional[float] = None
exclusiveMaximum: Optional[float] = None
minimum: Optional[float] = None
exclusiveMinimum: Optional[float] = None
maxLength: Optional[int] = Field(None, gte=0)
minLength: Optional[int] = Field(None, gte=0)
pattern: Optional[str] = None
maxItems: Optional[int] = Field(None, gte=0)
minItems: Optional[int] = Field(None, gte=0)
uniqueItems: Optional[bool] = None
maxProperties: Optional[int] = Field(None, gte=0)
minProperties: Optional[int] = Field(None, gte=0)
required: Optional[List[str]] = None
enum: Optional[List[Any]] = None
type: Optional[str] = None
allOf: Optional[List["Schema"]] = None
oneOf: Optional[List["Schema"]] = None
anyOf: Optional[List["Schema"]] = None
not_: Optional["Schema"] = Field(None, alias="not")
items: Optional["Schema"] = None
properties: Optional[Dict[str, "Schema"]] = None
additionalProperties: Optional[Union["Schema", Reference, bool]] = None
description: Optional[str] = None
format: Optional[str] = None
default: Optional[Any] = None
nullable: Optional[bool] = None
discriminator: Optional[Discriminator] = None
readOnly: Optional[bool] = None
writeOnly: Optional[bool] = None
xml: Optional[XML] = None
externalDocs: Optional[ExternalDocumentation] = None
example: Optional[Any] = None
deprecated: Optional[bool] = None

class Config:
extra: str = "allow"

It seems Schema.items should accept an array of schemas according to the JSON schema spec, but only the type Schema is allowed in the current code.

Operating System

Linux, Windows

Operating System Details

No response

FastAPI Version

0.70.0

Python Version

Python 3.9.5

Additional Context

No response

Issue 2:
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

# main.py

import uvicorn
from fastapi import FastAPI, Form

app = FastAPI()

@app.post("/")
def hello(arg: tuple[int, int] = Form(...)) -> str:
pass

if __name__ == "__main__":
uvicorn.run("main:app", port=8080)

Description

Run pip install uvicorn fastapi==0.68.0.

Run python ./main.py

Hit localhost:8080/docs, observe internal server error with below validation errors:

pydantic.error_wrappers.ValidationError: 2 validation errors for OpenAPI
components -> schemas -> Body_hello__post -> properties -> arg -> items
value is not a valid dict (type=type_error.dict)
components -> schemas -> Body_hello__post -> $ref
field required (type=value_error.missing)

Run pip install fastapi==0.67.0

Hit localhost:8080/docs, observe that endpoint documentation is successfully generated.

Operating System

Linux

Operating System Details

Ubuntu 20.04

FastAPI Version

0.68.0 has bug, 0.67.0 does not have bug.

Python Version

3.9

Additional Context

Any use of tuple in an input (Form, and BaseModel as JSON) or output (BaseModel as JSON) results in above error.