FastAPI Error: Invalid args for response field with Redis HashModel - Pydantic Issue

[codebyaadi]

I'm working on a FastAPI project where I'm trying to use the HashModel class from the redis_om library to interact with a Redis database. However, I've encountered an issue related to Pydantic when defining a response model for one of my API endpoints. Here's my code:

from fastapi import FastAPI
from fastapi.middleware.cors import CORSMiddleware
from redis_om import get_redis_connection, HashModel

app = FastAPI()

app.add_middleware(
    CORSMiddleware,
    allow_origins=['http://localhost:3000'],
    allow_methods=['*'],
    allow_headers=['*'])

redis = get_redis_connection(
    host='redis-hos.cloud.redislabs.com',
    port='port',
    password='password',
    decode_responses=True)

class Product(HashModel):
    name: str
    price: float
    quantity: int

    class Meta:
        database = redis

@app.get("/")
async def root():
    return {"message": "Hello, World!"}

@app.get("/product")
def all():
    # Fetch and return all products
    products = Product.all()
    return products

@app.post("/addproduct")
async def create(product: Product):
    # Create a new Product instance and save it to Redis
    return product.save()

This is the error :

fastapi.exceptions.FastAPIError: Invalid args for response field! Hint: check that <class 'main.Product'> is a valid Pydantic field type. If you are using a return type annotation that is not a valid Pydantic field (e.g. Union[Response, dict, None]) you can disable generating the response model from the type annotation with the path operation decorator parameter response_model=None. Read more: https://fastapi.tiangolo.com/tutorial/response-model/

[nznobody]

+1 - Facing same issue but with JsonModel derived class.

from typing import List
from aredis_om.model import JsonModel, Field

class Population(JsonModel):
    description: str
    session_ids: List[str] = Field(description="A list of session_ids associated with this population", default=[])

...

@population.get("/{population_id}")
async def get_population(population_id: str) -> Population:
    """
    Get a specific populations
    """
    ...

Just starting this code gives:
fastapi.exceptions.FastAPIError: Invalid args for response field! Hint: check that <class 'project.api.models.Population'> is a valid Pydantic field type. If you are using a return type annotation that is not a valid Pydantic field (e.g. Union[Response, dict, None]) you can disable generating the response model from the type annotation with the path operation decorator parameter response_model=None. Read more: https://fastapi.tiangolo.com/tutorial/response-model/

[nznobody]

This is already somewhat tracked: redis/redis-om-python#539