让mongoengine和django休息框架玩得很好

Question

我想知道如何让mongoengine和djangoREST框架相互合作.目前,我的模型是

from mongoengine import *
import datetime

class Blog(Document):
    post_id = IntField(unique=True)
    title = StringField(max_length=144, required=True)
    date_created = DateTimeField(default=datetime.datetime.now)
    body = StringField(required=True)

我将序列化程序定义为

from rest_framework.views import APIView
from rest_framework.response import Response
from .models import *

class BlogList(APIView):
    """
    Lists all blog posts, or creates a new post
    """
    def get(self, request, format=None):
        posts = Blog.objects.to_json()
        return Response(posts)

但是我收到了错误

TypeError at /blog/

__init__() takes exactly 1 argument (2 given)

Request Method:     GET
Request URL:    http://127.0.0.1:8000/blog/
Django Version:     1.5.1
Exception Type:     TypeError
Exception Value:    

__init__() takes exactly 1 argument (2 given)

这给出了以下回溯

response = callback(request, *callback_args, **callback_kwargs)

Answer 1

Django REST Framework旨在与Django的模型配合使用.由于MongoEngine不是Django模型的替代品,因此您需要为Django Rest框架定义更多函数.

如果您需要为MongoEngine构建框架,您可能需要查看django-tastypie-mongoengine.

如果您更喜欢使用Django REST Framework,那么它是完全可行的.你的BlogList类实际上是一个View,而不是一个Serializer.首先,定义一个序列化器类:

from rest_framework import serializers
from .models import Blog

class BlogSerializer(serializers.Serializer):
    post_id = serializers.IntegerField()
    title = serializers.CharField(max_length=144)
    date_created = serializers.DateTimeField(required=False)
    body = serializers.CharField()

    def restore_object(self, attrs, instance=None):
        if instance is not None:
            for k, v in attrs.iteritems():
                setattr(instance, k, v)
            return instance
        return Blog(**attrs)

由于MongoEngine文档不是Django Model实例,因此您需要自己创建对象而不是继承serializers.ModelSerializer.这就是这个restore_object方法的原因.从文档中:给定反序列化字段值的字典,[它将]更新现有模型实例,或创建新模型实例.

然后你可以定义你的视图,例如

from rest_framework import generics
from .models import Blog

class BlogList(generics.ListCreateAPIView):
    serializer_class = BlogSerializer

    def get_queryset(self):
        return Blog.objects

同样,Django REST Framework期望一些标准的Django模型没有被MongoEngine Documents验证,因此需要重新定义该get_queryset方法.

然后在你的urls.py中添加:

url(r'^blog/', BlogList.as_view(), name='blog-list'),