Django表单字段的验证方式

 1 def validate_name(value):
 2     try:
 3         # 查询存在的话抛出异常
 4         User.objects.get(username=value)
 5         raise ValueError("%s的用户已经存在"%value)
 6     except User.DoesNotExist:
 7         pass
 8 
 9 from blogapp.models import User
10 class Loginfm(forms.ModelForm):
11     # 与ModelForm中字段重名不会添加，这里用于给字段加验证器
12     username=forms.CharField(validators=[validate_name])
13     class Meta():
14         model=User
15         exclude=("id",‘email‘)

 1 from blogapp.models import User
 2 class Loginfm(forms.ModelForm):
 3     
 4     # clean_username为User类的一个方法
 5     # self代表表单自己
 6     def clean_username(self):
 7         value=self.cleaned_data.get("username")
 8         try:
 9             User.objects.get(username=value)
10             raise ValueError("%s的用户信息已经存在"%value)
11         except User.DoesNotExist:
12             pass
13         return value
14 
15     class Meta():
16         model=User
17         exclude=("id",‘email‘)

 1 from blogapp.models import User
 2 class Loginfm(forms.ModelForm):
 3     def clean(self):
 4         # 调用父类的方法
 5         # 获取表单所有的数据
 6         cleaned_data=super(Loginfm,self).clean()
 7         value=cleaned_data.get("username")
 8         try:
 9             User.objects.get(username=value)
10             self._errors[‘username‘]=self.error_class(["%s已经存在"%value])
11             
12         except User.DoesNotExist:
13             pass
14         return cleaned_data
15     class Meta():
16         model=User
17         exclude=("id",‘email‘)