text: # -*- coding: utf-8 -*-
  
  
  def get_dsn(config):
      assert config is not None, 'Need to inject ConfigMiddleware'
  
      databases = config._DATABASES.copy()
      database_user = config.DATABASES.copy()
  
      if config.TEST_RUN:
          database_user.update(config.TEST)
  
      for key, value in database_user.items():
          if value:
              databases[key] = value
  
      SQLALCHEMY_DATABASE_URI = '{type}://{username}:{password}@{host}:{port}/{database}'.format(
          **databases
      )
  
      return SQLALCHEMY_DATABASE_URI
  