Django休眠框架自动填充字段与用户.id

Question

我找不到自动填充我模型中“拥有者”字段的方法。我在使用DRF（Django REST框架）。如果我使用外键，用户可以从下拉框中选择拥有者，但这样没有意义。请帮帮我，我搞不定。views.py我没有包含进来，因为我觉得跟这个问题没关系。

models.py

class Note(models.Model):
    title = models.CharField(max_length=200)
    body = models.TextField()
    cr_date = models.DateTimeField(auto_now_add=True)
    owner = models.CharField(max_length=100)
  # also tried:
  # owner = models.ForeignKey(User, related_name='entries')

class Meta:
    ordering = ('-cr_date',)

def __unicode__(self):
    return self.title

serializers.py

class UserSerializer(serializers.ModelSerializer):

    class Meta:
        model = User
        fields = ('id', "username", 'first_name', 'last_name', )

class NoteSerializer(serializers.ModelSerializer):
    owner = request.user.id <--- wrong , but is what a need.
    # also tried :
    # owner = UserSerializer(required=True)

    class Meta:
        model = Note
        fields = ('title', 'body' )

Answer 1

Django Rest Framework 提供了一个叫做 pre_save() 的方法（在通用视图和混合类中），你可以对它进行重写。

class NoteSerializer(serializers.ModelSerializer):
    owner = serializers.Field(source='owner.username') # Make sure owner is associated with the User model in your models.py

然后在你的视图类中可以这样写：

def pre_save(self, obj):
    obj.owner = self.request.user

参考资料

http://www.django-rest-framework.org/tutorial/4-authentication-and-permissions#associating-snippets-with-users

https://github.com/tomchristie/django-rest-framework/issues/409#issuecomment-10428031