docs: def _initialize_providers(self):
          """Read config file and initialize providers"""
          configured_providers = active_config.DATABASES
          provider_objects = {}
  
          if not isinstance(configured_providers, dict) or configured_providers == {}:
              raise ConfigurationError(
                  "'DATABASES' config must be a dict and at least one "
                  "provider must be defined")
  
          if 'default' not in configured_providers:
              raise ConfigurationError(
                  "You must define a 'default' provider")
  
          for provider_name, conn_info in configured_providers.items():
              provider_full_path = conn_info['PROVIDER']
              provider_module, provider_class = provider_full_path.rsplit('.', maxsplit=1)
  
              provider_cls = getattr(importlib.import_module(provider_module), provider_class)
              provider_objects[provider_name] = provider_cls(conn_info)
  
          return provider_objects