I use pydantic in a FastAPI project to serialize SQLAlchemy entity objects, and I need to access the original entity object in @computed_field methods and validators in order to access data from relationships (which are not supposed to be themselves serialized).

I use pydantic in a FastAPI project to serialize SQLAlchemy entity objects, and I need to access the original entity object in @computed_field methods and validators in order to access data from relationships (which are not supposed to be themselves serialized).

The title says it all:

When creating classs by inheriting from BaseModel I can use model_fields property to get dict of field names and FieldInfo but how can I do it if I use Pydantic dataclass decorator instead of BaseModel?

I want to create a custom Pydantic type for Python’s ElementTree. It should accept string as input and type to parse the XML string via ElementTree.fromstring and raise appropriate error is invalid XML is found.

The root_validator that was available with Pydantic V1 allowed a flag called skip_on_failure, which allowed other validators to be run even if prior ones failed (when set to True).

I’m writing a custom PydanticBaseSettingsSource and processing fields of a specific type MyModel

I’m currently working with Pydantic’s URL type for URL validation in my Python project. However, it seems that Pydantic does not currently provide a built-in mechanism for this. So what is the best approach to restrict a URL to a specific list of hosts in Pydantic?

how to solve this pydantic validation issue?

I have several string fields: