代码：
class CommentSerializer(serializers.ModelSerializer):
class Meta:
model = Comment
fields = ('all')
depth = 1
@api_view(['GET'])
def comment_list(request):
if request.method == "GET":
comment_list = Comment.objects.all()
serializer = CommentSerializer(comment_list, many=True)
return Response(serializer.data)
设置深度之后可以取出全部，但是指定的话只能取到'belong_user_id'。像这样（fields = ('id','belong_user_id')）。想要取'belong_user_name'这个值，该怎么办？ 之前加了外键。
HTTP 200 OK
Allow: GET, OPTIONS
Content-Type: application/json
Vary: Accept
[
{
"id": 1,
"comment": "good",
"date": "2018-03-30T09:15:26.892685+08:00",
"belong_content": {
"id": 1,
"title": "第一个标题",
"content": "第一篇文章",
"date": "2018-03-30T09:15:04.915143+08:00"
},
"belong_user": {
"id": 1,
"password": "safsdfasf",
"last_login": "2018-03-30T09:13:59.645474+08:00",
"is_superuser": true,
"username": "jiang",
"first_name": "",
"last_name": "",
"email": "",
"is_staff": true,
"is_active": true,
"date_joined": "2018-03-30T09:12:51.736376+08:00",
"groups": [],
"user_permissions": []
}
}
]
