I'm working with FastAPI and MongoDB, and I've encountered a situation where I want to handle a specific field, the Gravatar email address, differently when it is absent. Specifically, I want to avoid returning "gravatar_email": null in the API response when the email is None (default value). Is there a built-in way in FastAPI or Pydantic to exclude fields with None values from the response? Any advice would be appreciated!
2 Answers
Just to clarify on the setup, there's also a base model approach you can take. You can define a base model like this to prevent repeating the config:
```python
class MyBaseModel(BaseModel):
model_config = ConfigDict(exclude_none=True)
```
Then, just inherit from MyBaseModel for your user model. This keeps things clean!
You can definitely exclude fields that have None values automatically by configuring your Pydantic model properly. Here's a quick example: create your User model like this:
```python
class User(BaseModel):
id: str
name: str
gravatar_email: str | None = None
model_config = {
"exclude_none": True
}
```
This way, if the gravatar_email is None, it won't be included in the response at all!
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