Django 的ForeignKey 是一种逻辑上的两个表的关联关系,可以指定是否使用数据库的 FOREIGN KEY 约束。 如: from django.db import models class Province(models.Model): name = models.CharField(max_length=16) def __unicode__(self): return self.
会将当时的model对象传入:param book: book的model对象"""returnbook.author.namedefxxxx(self,book):"...
fromdjangoimportformsclassFreeInputWidget(forms.TextInput):defrender(self,name,value,attrs=None,renderer=None):# 自定义渲染方式,支持自由格式输入# 可以使用HTML模板或其他方式来实现自定义渲染returnsuper().render(name,value,attrs,renderer)classMyModelForm(forms.ModelForm):my_foreign_key=forms.Foreig...
from django.db import models class Coding(models.Model): text = models.CharField(max_length=10) gender = models.IntegerField(unique=True,primary_key = True) # 设置性别 gender 为 primary key 我们定义了一个名叫coding的表格,里面包含两个字段:text,gender 将gender 字段设置为 primary key (主键)。
return u"%s the place" % self.name class Restaurant(models.Model): place = models.OneToOneField(Place, primary_key=True) serves_hot_dogs = models.BooleanField() serves_pizza = models.BooleanField() def __unicode__(self): return u"%s the restaurant" % self.place.name ...
class Car(models.Model): Manufacturer = models.ForeignKey(Manufacturer) name = models.CharField(max_length=30) 1. 2. 3. 4. 5. 6. 该关系,用sql语句来表示,就是: CREATE TABLE `model_test_manufacturer` ( `id` integer AUTO_INCREMENT NOT NULL PRIMARY KEY, ...
Your intermediate model must contain one - and only one - foreign key to the source model (this would be Group in our example), or you must explicitly specify the foreign keys Django should use for the relationship using ManyToManyField.through_fields. If you have more than one foreign key ...
ModelAdmin): pass 如果你必须在你的模型管理类的 __init__() 方法中引用你的模型管理类,例如 super(PersonAdmin, self).__init__(*args, **kwargs),你就不能使用这个装饰器。你可以使用 super().__init__(*args, **kwargs)。发现管理文件¶ 当你在 INSTALLED_APPS 配置中放入 'django.contrib....
ManyToManyField(verbose_name='粉丝们', to='UserInfo', through='UserFans', through_fields=('user', 'follower')) def __str__(self): return self.username class UserFans(models.Model): """ 互粉关系表 """ nid = models.AutoField(primary_key=True) user = models.ForeignKey(verbose_name='...
class Book(models.Model): id = models.AutoField(primary_key=True) #自动,主键 ... publish = models.CharField(max_length=32) def __str__(self): return self.title +'价格' +str(self.price) def Meta: ordering=['id','publish',] ...