10步入门Django Rest framework后端接口框架

10步入门DRF框架开发

1.安装django，版本1.11.20

安装djangorestframework, 版本3.11.0

2.注册djangorestframework到setting.py文件中的APP

3.创建项目

python mamage.py startproject DRF_learn

4.创建app,并注册

python manage.py startapp DRFDemo

5. 编写数据模型

E:\DRF_learn\DRFDemo\models.py

from django.db import models


# Create your models here.


class Author(models.Model):
    """
    图书作者表
    """
    name = models.CharField('作者姓名', max_length=20)
    age = models.SmallIntegerField('年龄')

    def __str__(self):
        return self.name


class Book(models.Model):
    """
    图书表
    """
    book_name = models.CharField('图书名称', max_length=100)
    author = models.ForeignKey(Author, related_name='author_book')
    publish_time = models.DateTimeField('出版时间', auto_now_add=True)

    def __str__(self):
        return self.book_name

6.数据迁移

python manage.py makemigrations

python manage.py migrate

7.编写api接口

　　在DRFDemo目录下新建api包，并创建author和book模块

author.py内容：

from rest_framework import generics, serializers
from ..models import Author


class AuthorSerializer(serializers.ModelSerializer):
    class Meta:
        model = Author
        fields = '__all__'


class CreateAuthor(generics.CreateAPIView):
    """
    新增作者
    """
    queryset = Author.objects.all()
    serializer_class = AuthorSerializer

book.py内容：

from rest_framework import generics
from rest_framework import serializers
from ..models import Book


class BookSerializer(serializers.ModelSerializer):
    """
    Book模型的序列化器
    """
    # ReadOnly增加序列化时额外的字段信息（友好显示图书作者名称）
    author_name = serializers.ReadOnlyField(source='author.name')

    class Meta:
        model = Book
        fields = '__all__'


class CreateBook(generics.CreateAPIView):
    """
    新增图书
    """
    # queryset = Book.objects.all()
    serializer_class = BookSerializer


class DeleteBook(generics.DestroyAPIView):
    """
    删除图书
    """
    queryset = Book.objects.all()
    serializer_class = BookSerializer


class UpdateBook(generics.UpdateAPIView):
    """
    修改图书信息
    """
    queryset = Book.objects.all()
    serializer_class = BookSerializer


class BookList(generics.ListAPIView):
    """
    获取所有的图书列表
    """
    queryset = Book.objects.all()
    serializer_class = BookSerializer


class BookDetail(generics.RetrieveAPIView):
    """
    获取单个图书信息
    """
    # 前端接口请求时只能在该queryset中查找结果，如果请求的资源不在该查询结果集中则不会返回具体的图书信息
    queryset = Book.objects.filter(author_id=3)
    serializer_class = BookSerializer

    # 重写该方法，获得具体的一个对象
    # def get_object(self):
    #     obj = Book.objects.get(id=1)
    #     return obj

总结：

　　以下常用的5种子类（CreateAPIView/DestroyAPIView/UpdateAPIView/ListAPIView/RetrieveAPIView）

　　中只有继承CreateAPIView的视图类不需要queryset属性，继承其它子类的视图类必须要有该属性，所有的视图都必须有serializer_class属性。

8. 编写路由

　　8.1 在DRFDemo下新增urls.py文件，里面写：

E:\DRF_learn\DRFDemo\urls.py

from django.conf.urls import url
from .api import book, author

urlpatterns = [
    url(r'^create_book$', book.CreateBook.as_view()),
    url(r'^delete_book/(?P<pk>\d+)$', book.DeleteBook.as_view()),
    url(r'^update_book/(?P<pk>\d+)$', book.UpdateBook.as_view()),
    url(r'^booklist$', book.BookList.as_view()),
    url(r'^book/(?P<pk>\d+)$', book.BookDetail.as_view()),
    url(r'^create_author$', author.CreateAuthor.as_view()),
]

注意：这里的接口命名不符合Restful规范，只是为了便于区分识别

　8.2 将子路由包含进项目主路由中：

E:\DRF_learn\DRF_learn\urls.py

from django.contrib import admin
from django.conf.urls import url, include

urlpatterns = [
    url('admin/', admin.site.urls),
    url(r'^drf_demo/', include('DRFDemo.urls'))
]