Django - Custom Form validation rules

Custom Form validation rules

class MyForm(forms.Form):
    # form可以校验的规则
    username = fields.CharField(max_length=32,min_length=3)  
    password = fields.CharField(max_length=32,min_length=3)
    re_password = fields.CharField(max_length=32,min_length=3)   

Local hook - validate the user name can not be repeated

def clean_username(self):
    # 获取username
    username = self.cleaned_data['username']

    # 判断用户名是否存在
    if models.User.objects.filter(username=username).count():
        # 存在即不符合规则，必须抛出ValidationError异常
        raise ValidationError('该用户名已存在')
    # 校验通过，则返回清洗后的数据
    return self.cleaned_data['username']

Global hooks - Inspection enter the same password twice

def clean(self):
    # 获取两次输入的密码
    password = self.cleaned_data['password']
    re_password = self.cleaned_data['re_password']
    
    # 判断是否相等，相等则返回数据，否则抛出ValidationError异常
    if password == re_password:
        return self.cleaned_data
    else:
        raise ValidationError('两次密码输入不一致')

Note: the function name and the local hook global hook, and return values ​​are abnormal is determined according to the internal source of write

1. The function named "clean_ field name" or "clean"

2. Data verification error, ValidationError can only throw an exception, because the capture anomalies in the source ValidationError

3. Data verification is successful, return data