old_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django.db import models
  
  
  class ModelCaching(models.Model):
      pass
  
new_contents: #!/usr/bin/env python
  # -*- coding: utf-8 -*-
  from django.db import models
  from django.core.cache import cache
  
  from .managers import CacheManager
  
  
  ModelBase = type(models.Model)
  
  
  class MetaCaching(ModelBase):
      def __new__(*args, **kwargs):
          new_class = ModelBase.__new__(*args, **kwargs)
          new_manager = CacheManager()
          new_manager.contribute_to_class(new_class, 'objects')
          new_class._default_manager = new_manager
          return new_class
  
  
subject: Create MetaCaching, ModelBase for core cache