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# On save validation
Pydantic has a very useful config to validate values on assignment - `validate_assignment = True`.
But, unfortunately, this is an expensive operation and doesn't fit some use cases.
You can validate all the values before saving the document (`insert`, `replace`, `save`, `save_changes`)
with beanie config `validate_on_save` instead.
This feature must be turned on in the `Settings` inner class explicitly:
```python
class Sample(Document):
num: int
name: str
class Settings:
validate_on_save = True
```
If any field has a wrong value,
it will raise an error on write operations (`insert`, `replace`, `save`, `save_changes`).
```python
sample = Sample.find_one(Sample.name == "Test")
sample.num = "wrong value type"
# Next call will raise an error
await sample.replace()
```
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