4 serializer 序列华模型数据

序列华模型数据

在http://www.django-rest-framework.org/api-guide/serializers/中描述到

The serializers in REST framework work very similarly to Django's Form and ModelForm classes. We provide a Serializerclass which gives you a powerful, generic way to control the output of your responses, as well as a ModelSerializer class which provides a useful shortcut for creating serializers that deal with model instances and querysets.

所以，序列化类非常类似Form，Serializer它能控制响应的输出内容。ModelSerializer能够快速处理模型实例和查询集。

这一节我们会用ModelSerializer来让ListView工作起来，下一节我们会用Shell来操作Serializer，让我们来更好地理解它怎么实时工作的。

serializer

创建文件posts.api.serializer.py

from rest_framework import serializers
from posts.models import Post 

class PostSerializer(serializers.ModelSerializer):
    class Meta:
        model = Post
        fields = [
            "title",
            "slug",
            "content"
        ]

我们继承自ModelSerializer，跟Form类似，定义了model和fields，fields里显式定义的这些字段将在api 视图中显示出来。

加这个类添加到视图中

from posts.api.serializers import PostSerializer
class PostListAPIView(ListAPIView):
    queryset = Post.objects.all()
    serializer_class = PostSerializer

访问 http://127.0.0.1:8000/api/posts/，正常显示了