Django 自定义模型管理器类2个应用
class BookManager(models.Manager): # 改变查询集的结果集 def all(self): books = super().all() # QuerySet books = books.filter(isDelete=False) return books # 封装函数：操作模型类对应的数据表（增删改查） def create_book(self, title, author): # book = BookInfo() # 另一个模型类 model_class = self.model # 可以获取当前模型类名，代替上一条代码 book = model_class book.title = title book.author = author book.save() return book class BookInfo(models.Model): title = models.CharField(max_length=20) author = models.CharField(max_length=10) objects = BookManager() # 自定义BookManager类的对象 ================================================================== # objects 是自己定义的，并非模型类里面的默认的 objects # 显示的结果将是未被逻辑删除的数据 >>> BookInfo.objects.all() >>> BookInfo.objects.create_book('了不起的盖茨比', '菲茨杰拉德')
