太受不了了，，REST_FRAMEWORK太方便啦~~

按英文原始的DOCUMENT走一圈，从最手工的输出到高度的集成。

最后真的就几行代码，实现最常用的JSON API。。纯RESTFUL风格。

但，其核心是要记住序列化生反序列的过程，都是要以PYTHON的原生数据结构为中间转化要素的。

原文如下：

We've now got a few snippet instances to play with. Let's take a look at serializing one of those instances.

serializer = SnippetSerializer(snippet)
serializer.data
# {'pk': 2, 'title': u'', 'code': u'print "hello, world"\n', 'linenos': False, 'language': u'python', 'style': u'friendly'}

At this point we've translated the model instance into Python native datatypes. To finalize the serialization process we render the data into json.

content = JSONRenderer().render(serializer.data)
content
# '{"pk": 2, "title": "", "code": "print \\"hello, world\\"\\n", "linenos": false, "language": "python", "style": "friendly"}'

Deserialization is similar. First we parse a stream into Python native datatypes...

from django.utils.six import BytesIO

stream = BytesIO(content)
data = JSONParser().parse(stream)

...then we restore those native datatypes into to a fully populated object instance.

serializer = SnippetSerializer(data=data)
serializer.is_valid()
# True
serializer.validated_data
# OrderedDict([('title', ''), ('code', 'print "hello, world"\n'), ('linenos', False), ('language', 'python'), ('style', 'friendly')])
serializer.save()
# <Snippet: Snippet object>

Notice how similar the API is to working with forms. The similarity should become even more apparent when we start writing views that use our serializer.

We can also serialize querysets instead of model instances. To do so we simply add a many=True flag to the serializer arguments.

serializer = SnippetSerializer(Snippet.objects.all(), many=True)
serializer.data
# [OrderedDict([('pk', 1), ('title', u''), ('code', u'foo = "bar"\n'), ('linenos', False), ('language', 'python'), ('style', 'friendly')]), OrderedDict([('pk', 2), ('title', u''), ('code', u'print "hello, world"\n'), ('linenos', False), ('language', 'python'), ('style', 'friendly')]), OrderedDict([('pk', 3), ('title', u''), ('code', u'print "hello, world"'), ('linenos', False), ('language', 'python'), ('style', 'friendly')])]

models.py

from django.db import models

# Create your models here.
from pygments.lexers import get_all_lexers
from pygments.styles import get_all_styles

LEXERS = [item for item in get_all_lexers() if item[1]]
LANGUAGE_CHOICES = sorted([(item[1][0], item[0]) for item in LEXERS])
STYLE_CHOICES = sorted((item, item) for item in get_all_styles())

class Snippet(models.Model):
    created = models.DateTimeField(auto_now_add=True)
    title = models.CharField(max_length=100, blank=True, default='')
    code = models.TextField()
    linenos = models.BooleanField(default=False)
    language = models.CharField(choices=LANGUAGE_CHOICES,
                                default='python',
                                max_length=100)
    style = models.CharField(choices=STYLE_CHOICES,
                             default='friendly',
                             max_length=100)

    class Meta:
        ordering = ('created',)

serializer.py

__author__ = 'sahara'
from rest_framework import  serializers
from snippets.models import Snippet, LANGUAGE_CHOICES, STYLE_CHOICES

class SnippetSerializer(serializers.ModelSerializer):
    class Meta:
        model = Snippet
        fields = ('id', 'title', 'code', 'linenos', 'language', 'style')

views.py

from snippets.models import Snippet
from snippets.serializers import SnippetSerializer
from rest_framework import generics

# Create your views here.

class SnippetList(generics.ListCreateAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

class SnippetDetail(generics.RetrieveUpdateDestroyAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer