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Questions tagged [pydantic]

Pydantic is a library for data validation and settings management based on Python type hinting and variable annotations. You can use Pydantic for defining schemas of complex structures in Python.

Pydantic is a library for data validation and settings management based on Python type hinting (PEP484) and variable annotations (PEP526). It allows for defining schemas in Python for complex structures.

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fastapi: mapping sqlalchemy database model to pydantic geojson feature

I just started playing with FastAPI, SQLAlchemy, Pydantic and I'm trying to build a simple API endpoint to return the rows in a postgis table as a geojson feature collection. This is my sqlalchemy model: class Poi(Base): __tablename__ = 'poi' …
dlqmap
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Constructor and Pydantic

I want to create a Pydantic class with a constructor that does some math on inputs and set the object variables accordingly: class PleaseCoorperate(BaseModel): self0: str next0: str def __init__(self, page: int, total: int, size: int): …
Jenia Ivanov
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How do I use FastAPI's "response_model_exclude_none=True" to exclude "None" values from nested models?

FastAPI shows that you can set response_model_exclude_none=True in the decorator to leave out fields that have a value of None: https://fastapi.tiangolo.com/tutorial/response-model/#use-the-response_model_exclude_unset-parameter I would like to do…
maccam912
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What is the Purpose of Pydantic's SecretStr?

I am learning the Pydantic module, trying to adopt its features/benefits via a toy FastAPI web backend as an example implementation. I chose to use Pydantic's SecretStr to "hide" passwords. I know it is not really secure, and I am also using passlib…
Mike Williamson
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How to extend a Pydantic object and change some fields' type?

There are two similar pydantic object like that. The only difference is some fields are optionally. How can I just define the fields in one object and extend into another one? class ProjectCreateObject(BaseModel): project_id: str …
woody
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Python Enum and Pydantic : accept enum member's composition

I have an enum : from enum import Enum class MyEnum(Enum): val1 = "val1" val2 = "val2" val3 = "val3" I would like to validate a pydantic field based on that enum. from pydantic import BaseModel class MyModel(BaseModel): …
jossefaz
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POST request response 422 error {'detail': [{'loc': ['body'], 'msg': 'value is not a valid dict', 'type': 'type_error.dict'}]}

My POST request continues to fail with 422 response, even though valid JSON is being sent. I am trying to create a web app that receives an uploaded text file with various genetic markers and sends it to the tensorflow model to make a cancer…
ahutchful
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How to properly handle join results from SQLAlchemy with Pydantic/FastAPI

I would like a piece of advice on handling the result of a join operation performed in SQLAlchemy and do the serialization with Pydantic (in FastAPI). If I am not mistaken, the result of the join on two table leads to a list of tuples of SQLAlchemy…
Flavien Lambert
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Private attributes in `pydantic`

I'm trying to get the following behavior with pydantic.BaseModel: class MyClass: def __init__(self, value: T) -> None: self._value = value # Maybe: @property def value(self) -> T: return self._value # Maybe: …
mkl
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Error Value not declarable with JSON Schema for PurePath with Pydantic and FastAPI

I'm trying to add a field path of type PureWindowsPath to my model. After implementing a custom validator as suggested here https://github.com/samuelcolvin/pydantic/issues/2089#issuecomment-890018075 I get the following error when trying to access…
Teharez
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pydantic.error_wrappers.ValidationError: 1 validation error for B

When I try to parse JSON object with Pydantic, my IDE returns error... Code: from pydantic import BaseModel, Field class A(BaseModel): a: str = Field(None, alias="А") class B(BaseModel): b: dict[str, A] = Field(None, alias="Б") j = { …
Azat
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Initialize a Literal enum in a pydantic model

pydantic supports regular enums just fine, and one can initialize an enum-typed field using both an enum instance and an enum value: from enum import Enum from pydantic import BaseModel class MyEnum(Enum): FOO = 'foo' BAR = 'bar' class…
Florian Brucker
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Is there any post_load in pydantic?

Previously I used the marshmallow library with the Flask. Some time ago I have tried FastAPI with Pydantic. At first glance pydantic seems similar to masrhmallow but on closer inspection they differ. And for me the main difference between them is…
egvo
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List of object attributes in pydantic model

I use Fast API to create a web service. There are following sqlAlchemy models: class User(Base): __tablename__ = 'user' account_name = Column(String, primary_key=True, index=True, unique=True) email = Column(String, unique=True,…
Dmitry Ezhov
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Import vaex error: PydanticImportError: `BaseSettings` has been moved to the `pydantic-settings` package

I am using Sagemaker notebook and when importing vaex, I am getting the below error. the version of vaex I'm using is 4.16.0 PydanticImportError: BaseSettings has been moved to the pydantic-settings package. See…
Kailash M S
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