drf hula hoop

Hula Hoop

Table 1.1 Design

• Not often change values ​​in memory: choices form, to avoid cross-table low performance.

• Sub-table: If the table columns are too many / a lot of content can choose the level of sub-table

• Table autocorrelation

Models django.db Import from class the UserInfo (models.Model):    "" "User Table" ""    username = models.CharField (the verbose_name = 'username', MAX_LENGTH = 32)    password = models.CharField (the verbose_name = 'password ', 64-max_length =) class article This article was (models.Model):    "" "article list" ""    category_choices = (        (1,' advice '),        (2,' News'),        (3, 'share' ),        (4, 'Q'),        (5 'other')    )    category = models.IntegerField (= the verbose_name 'classification' choices = category_choices)    title = models.CharField (the verbose_name = 'title',= 32 MAX_LENGTH)    Image = models.CharField (= the verbose_name 'image path', max_length = 128) # / media / upload / ....



















   summary = models.CharField(verbose_name='简介',max_length=255)
​
   comment_count = models.IntegerField(verbose_name='评论数',default=0)
   read_count = models.IntegerField(verbose_name='浏览数',default=0)
​
   author = models.ForeignKey(verbose_name='作者',to='UserInfo')
   date = models.DateTimeField(verbose_name='创建时间',auto_now_add=True)
​
class ArticleDetail(models.Model):
   article = models.OneToOneField(verbose_name='文章表',to='Article')
   content = models.TextField(verbose_name='内容')
​
​
class Comment(models.Model):
   """ 评论表 """
   article = models.ForeignKey(verbose_name='文章',to='Article')
   content = models.TextField(verbose_name='评论')
   user = models.ForeignKey(verbose_name='评论者',to='UserInfo')
   # parent = models.ForeignKey(verbose_name='回复',to='self', null=True,blank=True)
​
​

1.2 System Architecture (CMS)

 

 

1.3 functions to achieve

1.3.1 New article (can not write)

Once to increase the data in the two tables:    DEF POST (Self, Request, * args, ** kwargs):        "" "new article (should manage development in the background)" ""        Ser = ArticleSerializer (the Data = request.data )        ser_detail = ArticleDetailSerializer (Data = request.data)        IF ser.is_valid () and ser_detail.is_valid ():            # increase articles            article_object = ser.save (= the author_id. 1)            ser_detail.save (= article This article was article_object)            return the Response ( 'Add success')        return the Response ( 'error')

1.3.2 Article list

1.3.3 Article Details

1.3.4 Comments list

• View Comments List access time: http://127.0.0.1:8000/hg/comment/?article=2

• add comment

  http://127.0.0.1:8000/hg/comment/
  ​
  {
   article:1,
   content:'xxx'
  }

  http://127.0.0.1:8000/hg/comment/?article=1
  ​
  {
   content:'xxx'
  }

2. Screening

Case: In the list of articles, we attach filtering capabilities.

All: http: //127.0.0.1: 8000 / hg / article / 
Filter: http: //127.0.0.1:? 8000 / hg / article / category = 2

class ArticleView(APIView):
    """ 文章视图类 """
​
    def get(self,request,*args,**kwargs):
       """ 获取文章列表 """
       pk = kwargs.get('pk')
       if not pk:
           condition = {}
           category = request.query_params.get('category')
           if category:
               condition['category'] = category
           queryset = models.Article.objects.filter(**condition).order_by('-date')
            
           pager = PageNumberPagination()
           result = pager.paginate_queryset(queryset,request,self)
           ser = ArticleListSerializer(instance=result,many=True)
           return Response(ser.data)
       article_object = models.Article.objects.filter(id=pk).first()
       ser = PageArticleSerializer(instance=article_object,many=False)
       return Response(ser.data)
​

drf components: built-in filtering function

from django.shortcuts import render
from rest_framework.views import APIView
from rest_framework.response import Response
from . import models
​
from rest_framework.filters import BaseFilterBackend
​
class MyFilterBackend(BaseFilterBackend):
​
   def filter_queryset(self, request, queryset, view):
       val = request.query_params.get('cagetory')
       return queryset.filter(category_id=val)
    
​
class IndexView(APIView):
​
   def get(self,request,*args,**kwargs):
       # http://www.xx.com/cx/index/
       # models.News.objects.all()
​
       # http://www.xx.com/cx/index/?category=1
       # models.News.objects.filter(category=1)
​
       # http://www.xx.com/cx/index/?category=1
       # queryset = models.News.objects.all()
       # obj = MyFilterBackend()
       # result = obj.filter_queryset(request,queryset,self)
       # print(result)
        
       return Response('...')
​

3. view

• APIView, the feeling did not provide functionality.

• GenericAPIView, bridges, internally defined: get_queryset / get_serilizer / get_page ...

• ListAPIView,CreateAPIView,RetrieveAPIView,UpdateAPIView,DestroyAPIView

class TagSer(serializers.ModelSerializer):
    class Meta:
        model = models.Tag
        fields = "__all__"
​
class TagView(ListAPIView,CreateAPIView):
   queryset = models.Tag.objects.all()
   serializer_class = TagSer
​
   def get_serializer_class(self):
       # self.request
       # self.args
       # self.kwargs
       if self.request.method == 'GET':
           return TagSer
       elif self.request.method == 'POST':
           return OtherTagSer
   def perform_create(self,serializer):
       serializer.save(author=1)
​
class TagDetailView(RetrieveAPIView,UpdateAPIView,DestroyAPIView):
   queryset = models.Tag.objects.all()
   serializer_class = TagSer

 

Achieve hula hoop

ListAPIView, CreateAPIView, RetrieveAPIView, UpdateAPIView, DestroyAPIView 
+ 
custom hook Method