如何将用户模型传递到表单域（django）？

Question

基本上，我需要使用用户的密码哈希通过自定义模型字段来加密一些数据。看看我在这里使用的代码片段：Django Encryption。

我尝试这样做：

 
class MyClass(models.Model): 
    owner = models.ForeignKey(User) 
    product_id = EncryptedCharField(max_length=255, user_field=owner) 

................................................................................. 

    def formfield(self, **kwargs): 
     defaults = {'max_length': self.max_length, 'user_field': self.user_field} 
     defaults.update(kwargs) 
     return super(EncryptedCharField, self).formfield(**defaults)) 

但是，当我尝试使用user_field，我得到一个ForeignKey实例（当然！）：

 
user_field = kwargs.get('user_field') 
cipher = user_field.password[:32] 

任何帮助表示赞赏！

Answer 1

也许是这样的 - 重写save（）方法，你可以调用加密方法。

用于解密你可以使用signal post_init，所以每次你实例从数据库模型中的product_id字段被自动解密

class MyClass(models.Model): 
    user_field = models.ForeignKey(User) 
    product_id = EncryptedCharField() 
    ...other fields... 

    def save(self): 
     self.product_id._encrypt(product_id, self.user_field) 
     super(MyClass,self).save() 

    def decrypt(self): 
     if self.product_id != None: 
      user = self.user_field 
      self.product_id._decrypt(user=user) 

def post_init_handler(sender_class, model_instance): 
    if isinstance(model_instance, MyClass): 
     model_instance.decrypt() 

from django.core.signals import post_init 
post_init_connect.connect(post_init_handler) 


obj = MyClass(user_field=request.user) 
#post_init will be fired but your decrypt method will have 
#nothing to decrypt, so it won't garble your input 
#you'll either have to remember not to pass value of crypted fields 
#with the constructor, or enforce it with either pre_init method 
#or carefully overriding __init__() method - 
#which is not recommended officially 

#decrypt will do real decryption work when you load object form the database 

obj.product_id = 'blah' 
obj.save() #field will be encrypted 

也许有这样