Value Error Missing when using POST with FastAPI

Question

I'm building a simple API with FastAPI using the official documentation, but when I try to test it with postman I get the same error:

pydantic.error_wrappers.ValidationError

Here is my model:

class Owner(BaseModel):
  name: str
  address: str
  status: int

My endpoint:

@app.post('/api/v1/owner/add', response_model=Owner)
async def post_owner(owner: Owner):
   return conn.insert_record(settings.DB_TABLE_OWN, owner)

And my method to insert it to the database (RethinkDB)

@staticmethod
def insert_record(table, record):
    try:
        return DBConnection.DB.table(table).insert(record.json()).run()
    except RqlError:
        return {'Error': 'Could not insert record'}

This is the JSON I send using postman:

{
  "name": "Test",
  "address": "Test address",
  "status": 0
}

The error I get is the following:

pydantic.error_wrappers.ValidationError: 3 validation errors for Owner
response -> name
  field required (type=value_error.missing)
response -> address
  field required (type=value_error.missing)
response -> status
  field required (type=value_error.missing)

I gotta say that it was running fine until I stopped the server and got it running again.

Hope you can help me!

JPG · Accepted Answer · 2021-06-26 04:16:12Z

7

You have set the response_model=Owner which results in FastAPI to validate the response from the post_owner(...) route. Most likely, the conn.insert_record(...) is not returning a response as the Owner model.

Solutions

Change response_model to an appropriate one
Remove response_model

answered Jun 26, 2021 at 4:16

JPG

89.4k24 gold badges164 silver badges235 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

S.B · Accepted Answer · 2022-02-24 20:20:39Z

1

Import List from typing module:

from typing import List

then change response_model=Owner to response_model=List[Owner]

edited Feb 24, 2022 at 20:20

S.B

17k12 gold badges38 silver badges73 bronze badges

answered Feb 24, 2022 at 19:37

Rasanga srimal

212 bronze badges

Comments

Timsmall · Accepted Answer · 2022-05-17 23:44:05Z

0

@app.post('/api/v1/owner/add', response_model=Owner) def post_owner(owner: Owner): conn.insert_record(settings.DB_TABLE_OWN, owner) return owner

answered May 17, 2022 at 23:44

Timsmall

11 bronze badge

1 Comment

Community Over a year ago

As it’s currently written, your answer is unclear. Please edit to add additional details that will help others understand how this addresses the question asked. You can find more information on how to write good answers in the help center.

Collectives™ on Stack Overflow

Value Error Missing when using POST with FastAPI

3 Answers 3

Solutions

Comments

Comments

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

Solutions

Comments

Comments

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related