code: def add_entity(self, model, number, customFieldFormatters=None):
          
          if not isinstance(model, ModelSeeder):
              model = ModelSeeder(model)
  
          model.field_formatters = model.guess_field_formatters(self.faker)
          if customFieldFormatters:
              model.field_formatters.update(customFieldFormatters)
          
          klass = model.model
          self.entities[klass] = model
          self.quantities[klass] = number
          self.orders.append(klass)
docs: Add an order for the generation of $number records for $entity.
  
          :param model: mixed A Django Model classname,
          or a faker.orm.django.EntitySeeder instance
          :type model: Model
          :param number: int The number of entities to seed
          :type number: integer
          :param customFieldFormatters: optional dict with field as key and 
          callable as value
          :type customFieldFormatters: dict or None