Given a model instance, the display value for a field with choices can be accessed using the get_FOO_display() method. For example: from django.db import models class Person(models.Model): SHIRT_SIZES = { "S": "Small", "M": "Medium", "L": "Large", } name = models.CharField(ma...
If you change the value of the primary key on an existing object and then save it, a new object will be created alongside the old one. For example: from django.db import models class Fruit(models.Model): name = models.CharField(max_length=100, primary_key=True) >>> fruit = Fruit....
nickname = models.CharField(max_length=100, null=True) If I change it: nickname = models.CharField(default="noname", max_length=100, null=False) makemigrations builds a migration with this operation: migrations.AlterField( model_name='core_personmodel', name='nickname', field=models.CharField(...
对象.id 对象.value 代表行里面的数据 二、model里的字段 1、models.AutoField自增列= int(11) 如果没有的话,默认会生成一个名称为 id 的列,如果要显示的自定义一个自增列,必须将给列设置为主键 primary_key=True。2、models.CharField字符串字段 必须max_length 参数3、models.BooleanField布尔类型=tinyint(...
我试过指定adminuser作为默认值在窗体中,(它与其他标准表单字段,如CharField工作): adminuser = User.objects.filter(account=accountid).filter(primary_user=1) ... form = AccountDetailsForm({'adminuser': adminuser})returnrender_to_response('accounts/edit/accountdetails.html', ...
既然在models中定义了default值,为什么前台就是不出现默认值呢?后来,检查forms.py中的定义,发现 class NoteForm(forms.ModelForm): # 注释掉下面行就行了 #pub_date = forms.CharField(label=_("pub_date")) class Meta: model = Note exclude = ('user') 注释了NoteForm中的pub_date的重新定义之后,前台...
fromdjango.dbimportmodelsclassTopping(models.Model):# ...passclassPizza(models.Model):# ...toppings=models.ManyToManyField(Topping) 又或者一个音乐家可能属于多个groups,一个groups有多个音乐家这样的情况 fromdjango.dbimportmodelsclassPerson(models.Model):name=models.CharField(max_length=128)def__str__...
class Person(models.Model): name = models.CharField(max_length=20, verbose_name='name') company = models.CharField(max_length=50, verbose_name='company') 现在我们给Person模型增加一个address字段,新的模型如下所示: class Person(models.Model): ...
abstract = False|True # 定义该model 类是不是一个抽象类。 1. 2. 3. 4. 5. 简单model创建实例 from django.db import models class author(models.Model): name = models.CharField(max_length=32) age = models.SmallIntegerField() def __str__(self): # 最好都设置,因为在多对多字段对对象的...
- 字符串类型,Django Admin以及ModelForm中提供验证 Ipv4和Ipv6 - 参数: protocol,用于指定Ipv4或Ipv6, 'both',"ipv4","ipv6" unpack_ipv4, 如果指定为True,则输入::ffff:192.0.2.1时候,可解析为192.0.2.1,开启刺功能,需要protocol="both" URLField(CharField) ...