CBV to view DRF function / DRF quick overview

The first part of the question

1. Before and after the end of the separation?

   • vue.js
   • The back end to the front section return json data

2. Moving end prevailed.

   • app
   • App backend to return json data

3. PC-side application?

   crm项目，前段后端一起写，运行在浏览器上。 一般情况下都是PC端使用。 

The second part of the task

Previously written url:

http://127.0.0.1:8000/info/get/
http://127.0.0.1:8000/info/add/
http://127.0.0.1:8000/info/update/
http://127.0.0.1:8000/info/delete/

Now we have: to follow restful specification

http://127.0.0.1:8000/info/
    get,获取数据
    post，添加
    put，更新
    delete，删除

: Django can implement an interface specification based on the development of follow restful

• FBV, can achieve much trouble.
• CBV, as compared to short-answer method according distinction made different.

The third part acquaintance drf

3.1 Installation

pip3 install djangorestframework

3.2

• Register app

  INSTALLED_APPS = [
      'django.contrib.admin',
      'django.contrib.auth',
      'django.contrib.contenttypes',
      'django.contrib.sessions',
      'django.contrib.messages',
      'django.contrib.staticfiles',
      'rest_framework'
  ]

• Write route

  from django.conf.urls import url
  from django.contrib import admin
  from api import views
  
  urlpatterns = [
      url(r'^drf/info/', views.DrfInfoView.as_view()),
  ]
  

• Write view

  from rest_framework.views import APIView
  from rest_framework.response import Response
  
  class DrfInfoView(APIView):
  
      def get(self,request,*args,**kwargs):
          data = [
              {'id': 1, 'title': '震惊了...王阳居然...', 'content': '...'},
              {'id': 2, 'title': '震惊了...王阳居然...', 'content': '...'},
              {'id': 3, 'title': '震惊了...王阳居然...', 'content': '...'},
              {'id': 4, 'title': '震惊了...王阳居然...', 'content': '...'},
          ]
          return Response(data)

DRF application scenarios

以后在公司参与前后端分离项目、参与为app写接口时，用drf会比较方便。

to sum up

• restful specification

  1.给别人提供一个URL，根据URL请求方式的不同，做不同操作。
    get,获取
    post,增加
    put，全部更新
    patch,局部更新
    delete,删除
  2.数据传输基于json格式。

• drf framework

  不基于drf也可以实现restful规范来开发接口程序。
  
  使用了drf之后，可以快速帮我们开发restful规范来开发接口。

the fourth part

4.1 to create and initialize a database program

4.2 Interface: When implementing access interface, create an article type

from django.conf.urls import url
from django.contrib import admin
from api import views
urlpatterns = [
    url(r'^drf/category/', views.DrfCategoryView.as_view()),
]

from rest_framework.views import APIView
from rest_framework.response import Response
class DrfCategoryView(APIView):
    pass

Assumptions: I'm the preceding, you are back end.

After the completion of the development tell the front:

http://127.0.0.1:8000/drf/category/

Requesting analog front-end tool: postman

Request mode:

x-www-urlencoded

request.body: name=alex&age=19&gender=12
request.POST: {'name': ['alex'], 'age': ['19'], 'gender': ['12']}

application/json

request.body: b'{"ID":1,"name":"Alex","age":19}'
request.POST: 没有值

Answers

from django.conf.urls import url
from django.contrib import admin
from api import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^info/', views.InfoView.as_view()),
    url(r'^drf/info/', views.DrfInfoView.as_view()),
    url(r'^drf/category/', views.DrfCategoryView.as_view()),
]

from api import models
class DrfCategoryView(APIView):

    def post(self,request,*args,**kwargs):
        """增加一条分类信息"""
        models.Category.objects.create(**request.data)
        return Response('成功')

4.3 Interface: Get all post types

from api import models
class DrfCategoryView(APIView):
    def get(self,request,*args,**kwargs):
        """获取所有文章分类"""
        queryset = models.Category.objects.all().values('id','name')
        data_list = list(queryset)
        return Response(data_list)

    def post(self,request,*args,**kwargs):
        """增加一条分类信息"""
        models.Category.objects.create(**request.data)
        return Response('成功')

4.4 Interface: Get more information about an article type

from django.conf.urls import url
from django.contrib import admin
from api import views
urlpatterns = [
    url(r'^drf/category/$', views.DrfCategoryView.as_view()),
    url(r'^drf/category/(?P<pk>\d+)/$', views.DrfCategoryView.as_view()),
]

from api import models
from django.forms.models import model_to_dict
class DrfCategoryView(APIView):
    def get(self,request,*args,**kwargs):
        """获取所有文章分类/单个文章分类"""
        pk = kwargs.get('pk')
        if not pk:
            queryset = models.Category.objects.all().values('id','name')
            data_list = list(queryset)
            return Response(data_list)
        else:
            category_object = models.Category.objects.filter(id=pk).first()
            data = model_to_dict(category_object)
            return Response(data)

    def post(self,request,*args,**kwargs):
        """增加一条分类信息"""
        models.Category.objects.create(**request.data)
        return Response('成功')

4.5 Interface: Update and Delete article classification

from django.conf.urls import url
from django.contrib import admin
from api import views
urlpatterns = [
    url(r'^drf/category/$', views.DrfCategoryView.as_view()),
    url(r'^drf/category/(?P<pk>\d+)/$', views.DrfCategoryView.as_view()),
]

from api import models
from django.forms.models import model_to_dict
class DrfCategoryView(APIView):
    def get(self,request,*args,**kwargs):
        """获取所有文章分类/单个文章分类"""
        pk = kwargs.get('pk')
        if not pk:
            queryset = models.Category.objects.all().values('id','name')
            data_list = list(queryset)
            return Response(data_list)
        else:
            category_object = models.Category.objects.filter(id=pk).first()
            data = model_to_dict(category_object)
            return Response(data)

    def post(self,request,*args,**kwargs):
        """增加一条分类信息"""
        models.Category.objects.create(**request.data)
        return Response('成功')

    def delete(self,request,*args,**kwargs):
        """删除"""
        pk = kwargs.get('pk')
        models.Category.objects.filter(id=pk).delete()
        return Response('删除成功')

    def put(self,request,*args,**kwargs):
        """更新"""
        pk = kwargs.get('pk')
        models.Category.objects.filter(id=pk).update(**request.data)
        return Response('更新成功')

The fifth part of the sequence of drf

drf of serializers help us provide

• Data validation
• Serialization

from django.conf.urls import url
from django.contrib import admin
from api import views
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^info/$', views.InfoView.as_view()),
    url(r'^drf/info/$', views.DrfInfoView.as_view()),
    url(r'^drf/category/$', views.DrfCategoryView.as_view()),
    url(r'^drf/category/(?P<pk>\d+)/$', views.DrfCategoryView.as_view()),


    url(r'^new/category/$', views.NewCategoryView.as_view()),
    url(r'^new/category/(?P<pk>\d+)/$', views.NewCategoryView.as_view()),
]

from rest_framework import serializers

class NewCategorySerializer(serializers.ModelSerializer):
    class Meta:
        model = models.Category
        # fields = "__all__"
        fields = ['id','name']

class NewCategoryView(APIView):
    def get(self,request,*args,**kwargs):
        pk = kwargs.get('pk')
        if not pk:
            queryset = models.Category.objects.all()
            ser = NewCategorySerializer(instance=queryset,many=True)
            return Response(ser.data)
        else:
            model_object = models.Category.objects.filter(id=pk).first()
            ser = NewCategorySerializer(instance=model_object, many=False)
            return Response(ser.data)

    def post(self,request,*args,**kwargs):
        ser = NewCategorySerializer(data=request.data)
        if ser.is_valid():
            ser.save()
            return Response(ser.data)
        return Response(ser.errors)

    def put(self,request,*args,**kwargs):
        pk = kwargs.get('pk')
        category_object = models.Category.objects.filter(id=pk).first()
        ser = NewCategorySerializer(instance=category_object,data=request.data)
        if ser.is_valid():
            ser.save()
            return Response(ser.data)
        return Response(ser.errors)

    def delete(self,request,*args,**kwargs):
        pk = kwargs.get('pk')
        models.Category.objects.filter(id=pk).delete()
        return Response('删除成功')

to sum up

1. What is before and after the end of the separation?
   • Front-end write-only front-end code
   • Back-end write-only back-end code
   • Data transmission request via the interface front end, a rear end to the front end of the return

2. drf components

   帮助们在django框架基础上快速搭建遵循restful规范接口的程序。

3. Functional components drf

   • Parser, parse request data volume, turning it into a format we want. request.data
   • Serialization of an object or a list of objects (QuerySet) serialized form validation operations and functions.
   • View, inheritance APIView (inherited django's View inside apiview)

4. postman

   模拟浏览器进行发送请求

5. Find the order template

   优先根目录下：templates
   根据app的注册顺序去每个app的templates目录中找。

6. At the end of the URL add terminator