新建项目

和helloWord项目一样，就是建项目，搭建Djangorest的项目，现在因为是做代码片段高亮显示的项目，所以，需要一个新表，所以我们需要在model.py里面写一个实体类

创建model，并且生成数据表

from django.db import models

# Create your models here.
# 以下的都是官网复制过来的

from pygments.lexers import get_all_lexers   # 语言库
from pygments.styles import get_all_styles   # 风格库

# 将语言库里面的语言 放到数组里面
LEXERS = [item for item in get_all_lexers() if item[1]]
LANGUAGE_CHOICES = sorted([(item[1][0], item[0]) for item in LEXERS])

# 将风格库里面的东西放到数组里面
STYLE_CHOICES = sorted((item, item) for item in get_all_styles())


from pygments.lexers import get_lexer_by_name
from pygments.formatters.html import HtmlFormatter
from pygments import highlight


# 创建代码片段表
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)  # 是否要开启行号
    language = models.CharField(choices=LANGUAGE_CHOICES, default='python', max_length=100) # 语言选择
    style = models.CharField(choices=STYLE_CHOICES, default='friendly', max_length=100)  # 风格选择
    owner = models.ForeignKey('auth.User', related_name='snippets', on_delete=models.CASCADE, null=True, blank=True)
    highlighted = models.TextField(null=True, blank=True)  # 具体的代码片段

    class Meta:
        # 根据数据创建时间 进行排序
        ordering = ('created',)

    def save(self, *args, **kwargs):
        """ 高亮显示相关 """
        lexer = get_lexer_by_name(self.language)
        linenos = self.linenos and 'table' or False
        options = self.title and {
   'title': self.title} or {
   }
        formatter = HtmlFormatter(style=self.style, linenos=linenos, full=True, **options)
        self.highlighted = highlight(self.code, lexer, formatter)
        super(Snippet, self).save(*args, **kwargs)

创建序列化文件

from rest_framework import serializers
from snippetsapp.models import Snippet, LANGUAGE_CHOICES, STYLE_CHOICES



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

以后这个文件里面的类 就是继承serializers.ModelSerializer，就是这个，一定要记住

view里面的代码

第三级url的路径

from django.conf.urls import url
from rest_framework.urlpatterns import format_suffix_patterns
from snippetsapp import views

urlpatterns = [
    url(r'^snippets/$', views.SnippetList.as_view(), name='snippet-list'),
    url(r'^snippets/(?P<pk>[0-9]+)/$', views.SnippetDetail.as_view(), name='snippet-detail'),
]

urlpatterns = format_suffix_patterns(urlpatterns)

第三级view代码的书写(继承)

工作中，有可能用

# 第三级 实现浏览器输入json后缀，查询数据的方法是
# 方法名称里面写 format=None ，url里面写 urlpatterns = format_suffix_patterns(urlpatterns)
from snippetsapp.models import Snippet
from snippetsapp.serializers import SnippetSerializer
from django.http import Http404
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework import status


class SnippetList(APIView):
    """ LC 查询全部数据，和新增 """
    def get(self, request, format=None):
        snippets = Snippet.objects.all()
        serializer = SnippetSerializer(snippets, many=True)
        return Response(serializer.data)

    def post(self, request, format=None):
        serializer = SnippetSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)


class SnippetDetail(APIView):
    """ RUD """
    def get_object(self, pk):
        try:
            return Snippet.objects.get(pk=pk)
        except Snippet.DoesNotExist:
            raise Http404

    def get(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerializer(snippet)
        return Response(serializer.data)

    def put(self, request, pk, format=None):
        snippet = self.get_object(pk)
        serializer = SnippetSerializer(snippet, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk, format=None):
        snippet = self.get_object(pk)
        snippet.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

第3.5级的view

工作中，不用这个

# 第四级
from snippetsapp.models import Snippet
from snippetsapp.serializers import SnippetSerializer
from rest_framework import mixins
from rest_framework import generics

class SnippetList(mixins.ListModelMixin,
                  mixins.CreateModelMixin,
                  generics.GenericAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    def get(self, request, *args, **kwargs):
        return self.list(request, *args, **kwargs)

    def post(self, request, *args, **kwargs):
        return self.create(request, *args, **kwargs)


class SnippetDetail(mixins.RetrieveModelMixin,
                    mixins.UpdateModelMixin,
                    mixins.DestroyModelMixin,
                    generics.GenericAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    def get(self, request, *args, **kwargs):
        return self.retrieve(request, *args, **kwargs)

    def put(self, request, *args, **kwargs):
        return self.update(request, *args, **kwargs)

    def delete(self, request, *args, **kwargs):
        return self.destroy(request, *args, **kwargs)

第四级的view

最常用的

# 继承工具集（还有视图集） 第四级
class SnippetList(ListCreateAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    # permission_classes = (permissions.IsAuthenticatedOrReadOnly,)

    def perform_create(self, serializer):
        serializer.save()


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

页面展示HTML格式的代码

我们保存到数据库的代码片段是HTML格式的，我们如何再页面进行展示

view里面写

# 进行HTML格式的展示
from rest_framework import  renderers
from rest_framework.response import Response
class SnippetHighlight(GenericAPIView):
    queryset = Snippet.objects.all()
    # 设置渲染器
    renderer_classes = (renderers.StaticHTMLRenderer,)

    def  get(self,request,*args,**kwargs):
        snippets = self.get_object()
        return  Response(snippets.highlighted)

url里面写

 url(r'^snippets/(?P<pk>[0-9]+)/highlight/$', 
views.SnippetHighlight.as_view(), name='SnippetHighlight'),

局部权限控制

在view里面对应的类方法里面写

# 继承工具集（还有视图集） 第四级
class SnippetList(ListCreateAPIView):
    queryset = Snippet.objects.all()
    serializer_class = SnippetSerializer

    # 访问这个类的 权限的控制
    permission_classes = (permissions.IsAuthenticatedOrReadOnly,)

    def perform_create(self, serializer):
        serializer.save()