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from abc import ABCMeta
from operator import itemgetter
from django.db import models
class ModelReprMixin:
"""Mixin providing a `__repr__()` to display model class name and initialisation parameters."""
def __repr__(self):
"""Returns the current model class name and initialisation parameters."""
attributes = ' '.join(
f'{attribute}={value!r}'
for attribute, value in sorted(
self.__dict__.items(),
key=itemgetter(0)
)
if not attribute.startswith('_')
)
return f'<{self.__class__.__name__}({attributes})>'
class ModelTimestampMixin(models.Model):
"""Mixin providing created_at and updated_at fields."""
created_at = models.DateTimeField(auto_now_add=True)
updated_at = models.DateTimeField(auto_now=True)
class Meta:
"""Metaconfig for the mixin."""
abstract = True
class AbstractModelMeta(ABCMeta, type(models.Model)):
"""Metaclass for ABCModel class."""
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