Pydantic Fabricated
A Python package that provides a metaclass for fabricating subclasses from dictionaries inside Pydantic models. This library seamlessly integrates with Pydantic's type system to enable dynamic object creation based on type definitions.
Installation
pip install pydantic-fabricated
Features
- Dynamic object creation from type definitions
- Seamless integration with Pydantic models
- Type-safe parameter validation
- Support for JSON serialization/deserialization
- Discriminated unions for type-safe polymorphism
Quick Start
Here's a simple example of how to use Pydantic Fabricated:
import os
from pydantic_settings import BaseSettings, SettingsConfigDict
from pydantic_fabricated import PydanticFabricated
# Define a base class using the metaclass
class Shape(metaclass=PydanticFabricated):
pass
# Define concrete implementations
class Circle(Shape):
def __init__(self, radius: float):
self.radius = radius
class Rectangle(Shape):
def __init__(self, width: float, height: float):
self.width = width
self.height = height
# Create instances using the fabricate_from_type method
circle = Shape.fabricate_from_type('Circle', {'radius': 5.0})
rectangle = Shape.fabricate_from_type('Rectangle', {'width': 10.0, 'height': 20.0})
# Or use with Pydantic Settings
class Settings(BaseSettings):
model_config = SettingsConfigDict(env_prefix='my_prefix_')
shape: Shape
os.environ['MY_PREFIX_SHAPE'] = r'{"type": "Circle", "radius": 5.0}'
settings = Settings()
Requirements
- Python ≥ 3.13
- Pydantic ≥ 2.11.9
License
Apache License 2.0
Links
Contributing
Contributions are welcome! Please feel free to submit a Pull Request.
Additional Documentation
1 maintainer
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