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Registers a model class in a global registry dictionary, enabling dynamic model lookup and management. Can be used as a decorator or called directly.

Purpose

This function serves as a registration mechanism for model classes that inherit from BaseModel. It stores model classes in a global registry (_model_registry) using the class name as the key, allowing for dynamic model discovery, instantiation, and management throughout the application. This pattern is commonly used in plugin architectures, ORM systems, and frameworks that need to track and access model definitions at runtime.

Source Code

def register_model(model_class: Type[BaseModel]) -> Type[BaseModel]:
    """
    Register a model class in the registry.
    
    Args:
        model_class: Model class to register
        
    Returns:
        The registered model class (for decorator usage)
    """
    _model_registry[model_class.__name__] = model_class
    logger.debug(f"Registered model: {model_class.__name__}")
    return model_class

Parameters

Parameter Details

model_class: A class type that inherits from BaseModel. This is the model class to be registered in the global registry. The class must have a __name__ attribute (standard for all Python classes). Expected to be a concrete model class like DocUser, ControlledDocument, DocumentVersion, ReviewCycle, ReviewComment, or ApprovalCycle.

Return Value

Type: Type[BaseModel]

Returns the same model class that was passed as input (Type[BaseModel]). This pass-through return enables the function to be used as a decorator while maintaining the original class definition. The returned class is functionally identical to the input but has been registered in the global _model_registry dictionary.

Dependencies

• logging

Required Imports

import logging
from typing import Type
from CDocs.models.user_extensions import DocUser
from CDocs.models.document import ControlledDocument
from CDocs.models.document import DocumentVersion
from CDocs.models.review import ReviewCycle
from CDocs.models.review import ReviewComment
from CDocs.models.approval import ApprovalCycle

Usage Example

# As a decorator
from typing import Type
import logging

logger = logging.getLogger(__name__)
_model_registry = {}

class BaseModel:
    pass

@register_model
class MyModel(BaseModel):
    def __init__(self, name):
        self.name = name

# Direct function call
class AnotherModel(BaseModel):
    pass

register_model(AnotherModel)

# Access registered models
print(_model_registry.keys())  # Output: dict_keys(['MyModel', 'AnotherModel'])
MyModelClass = _model_registry['MyModel']
instance = MyModelClass('example')

Best Practices

• Use as a decorator (@register_model) above class definitions for cleaner syntax
• Ensure model class names are unique to avoid overwriting existing registrations
• Register models early in application initialization before attempting to access them from the registry
• Consider implementing a get_model() function to safely retrieve models from the registry with error handling
• The function logs at DEBUG level, so configure logging appropriately to see registration messages
• All registered models should inherit from BaseModel to maintain type consistency
• Be aware that this modifies global state (_model_registry), which may have implications for testing and concurrency

Tags

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