[Python] Unhashable type in FastAPI request

I am writing a post-api using fastapi. The required request-format is:

{
"leadid":LD123,
"parties":[
{
"uid":123123,
"cust_name":"JOhn Doe",
}, ...]}


The fastapi code in python is:

class Customer(BaseModel):
UID: str
CustName: str

class PackageIn(BaseModel):
lead_id: str
parties: Set[Customer]
# threshold: Optional[int] = 85

app = FastAPI()

@app.post('/')
async def nm_v2(packageackageIn):
return {"resp":"Response"}


When I visit the SwaggerUI to submit the response, the error is "422 Error: Unprocessable Entity". Also, the SwaggerUI doc states

{
"detail": [
{
"loc": [
"body"
],
"msg": "unhashable type: 'Customer'",
"type": "type_error"
}
]
}


I do not know how to create this dict() structure for request payload without creating a separate pydantic based class called Customer. Pl tell me how to rectify the error.

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