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(package:PackageIn):
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.
Pytdantic BaseClass is not hashable. There is a discussion about this feature, i guess it will not be implemented. There is workaround in the discussion, for your case you can try this:
from pydantic import BaseModel
from typing import Set
class MyBaseModel(BaseModel):
def __hash__(self): # make hashable BaseModel subclass
return hash((type(self),) + tuple(self.__dict__.values()))
class Customer(MyBaseModel): # Use hashable sublclass for your model
UID: str
CustName: str
class PackageIn(BaseModel):
lead_id: str
parties: Set[Customer]
# threshold: Optional[int] = 85
data = {
"lead_id": 'LD123',
"parties": [
{
"UID": 123123,
"CustName": "JOhn Doe",
}]}
PackageIn.parse_obj(data) # This part fastapi will make on post request, just for test
> <PackageIn lead_id='LD123' parties={<Customer UID='123123' CustName='JOhn Doe'>}>