Pydantic validation error field required in FastAPI while using environments

Question

I was following a Python API development course on FreeCodeCamp on YouTube where we moved some static values to environment variables. This is the error I got while trying to reload the app:

pydantic.error_wrappers.ValidationError: 8 validation errors for Settings
database_hostname
  field required (type=value_error.missing)
database_port
  field required (type=value_error.missing)
database_password
  field required (type=value_error.missing)
database_name
  field required (type=value_error.missing)
database_username
  field required (type=value_error.missing)
secret_key
  field required (type=value_error.missing)
algorithm
  field required (type=value_error.missing)
access_token_expire_minutes
  field required (type=value_error.missing)

Here's my schema (config.py):

class Settings(BaseSettings):
    database_hostname: str
    database_port: str
    database_password: str
    database_name: str
    database_username: str
    secret_key: str
    algorithm: str
    access_token_expire_minutes: int

    class Config:
        env_file = '../.env'

Here's my environment (.env):

DATABASE_HOSTNAME=localhost
DATABASE_PORT=5432
DATABASE_PASSWORD=password
DATABASE_NAME=fastapi
DATABASE_USERNAME=postgres
SECRET_KEY=123456789
ALGORITHM=HS256
ACCESS_TOKEN_EXPIRE_MINUTES=60

How do I make my BaseSettings class able to read the environment variables in the .env file?

Codegeoss · Accepted Answer · 2022-07-04 11:28:37Z

7

I was able to resolve the error by using a full path in the project. I've got the main project folder and within that the .env file and an app folder. My config.py file is in app/ so the relative path to the env file from config is /../.env:

Don't forget to import os

class Settings(BaseSettings):
    database_hostname: str
    database_port: str
    database_password: str
    database_name: str
    database_username: str
    secret_key: str
    algorithm: str
    access_token_expire_minutes: int

    class Config:
        env_file = f"{os.path.dirname(os.path.abspath(__file__))}/../.env"

answered Jul 4, 2022 at 11:28

Codegeoss

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Kwaku Owusu Dankwah · Accepted Answer · 2024-03-25 20:08:15Z

0

Try this

if .env file is the same folder as your main app folder.

class Settings(BaseSettings):
    database_hostname: str
    database_port: str
    database_password: str
    database_name: str
    database_username: str
    secret_key: str
    algorithm: str
    access_token_expire_minutes: int

    class Config:
        env_file = '.env'

answered Mar 25, 2024 at 20:08

Kwaku Owusu Dankwah

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