drf框架使用之 路飞学城(第一天)

1. 路飞学城第一天: 知识点 使用的是序列化与反序列化的使用:

1.创建一个公共相应的Json方法:

#创建一个公共响应的类:

class LuffyResponse():
    def __init__(self):
        self.status='100'
        self.msg=None
        self.data=None
    @property
    def get_dic(self):
        return self.__dict__

#公共异常类
class CommonException(Exception):
    def __init__(self,msg):
        self.msg=msg

 

from rest_framework.response import Response
from rest_framework.views import APIView
from api import models
from api.utils.commonutils import LuffyResponse
from api.utils.commonutils import CommonException

from api.luffyserializers import Courseserializers
from api.luffyserializers import CoursesDetailSerializers
from rest_framework.viewsets import ViewSetMixin
from django.core.exceptions import ObjectDoesNotExist
import uuid

class LoginView(APIView):
    def post(self, request):
        response=LuffyResponse()
        name = request.data.get('name')
        pwd = request.data.get('pwd')
        try:
            user=models.UserInfo.objects.get(username=name,password=pwd)    #判断用户是否存在,得到一个用户对象

            token=uuid.uuid4()      #通过uuid生成token类的字符串
            ret=models.Token.objects.update_or_create(user=user,defaults={'key':token}) #直接保存修改原来的
            response.token=token
            response.name=name
            response.msg='登录成功'

        except ObjectDoesNotExist as e:     #完成程序的健壮性有问题直接抛出异常
            response.status=101
            response.msg='用户名或密码错误'
        except Exception as e:
            response.status=105
            response.msg=str(e)
        return Response(response.get_dic)

from rest_framework import serializers
from api import models


class Courseserializers(serializers.ModelSerializer):
    class Meta:
        model = models.Course
        fields = '__all__'

    price = serializers.SerializerMethodField()

    def get_price(self, obj):
        price_policy = obj.price_policy.all().order_by('-price').first()
        return price_policy.price


class PolicyPriceSerializers(serializers.ModelSerializer):
    class Meta:
        model = models.PricePolicy
        fields = ['price', 'valid_period', 'valid_per_display']

    # valid_per_display=serializers.CharField(source='get_valid_period_display')
    valid_per_display = serializers.SerializerMethodField()

    def get_valid_per_display(self, obj):
        return obj.get_valid_period_display()


class CoursesDetailSerializers(serializers.ModelSerializer):
    class Meta:
        model = models.CourseDetail
        fields = '__all__'

    # 取出课程的所有价格策略
    policy_price_list = serializers.SerializerMethodField()

    def get_policy_price_list(self, obj):
        policy_list = obj.course.price_policy.all()
        # policy_ser=PolicyPriceSerializers(instance=policy_list,many=True)
        # return policy_ser.data

        return [{'id': policy.pk, 'valid_per_display': policy.get_valid_period_display(),'price':policy.price} for policy in policy_list]

    course_name=serializers.CharField(source='course.name')

    teachers=serializers.SerializerMethodField()
    def get_teachers(self,obj):
        teacher_list=obj.teachers.all()

        return [{'id':teacher.pk,'name':teacher.name}  for teacher in teacher_list]

 

from rest_framework.response import Response
from rest_framework.views import APIView
from api import models
from api.utils.commonutils import LuffyResponse
from api.utils.commonutils import CommonException

from api.luffyserializers import Courseserializers
from api.luffyserializers import CoursesDetailSerializers
from rest_framework.viewsets import ViewSetMixin
from django.core.exceptions import ObjectDoesNotExist
class CourseView(ViewSetMixin,APIView):

    def get_list(self, request, *args, **kwargs):
        response = LuffyResponse()
        try:
            category=int(request.GET.get('category',None))      #获取课程的类型,转换为数字形式
            course_list = models.Course.objects.all()

            if category:
                course_list=course_list.filter(course_category_id=category) #过滤课程类型

            course_ser = Courseserializers(instance=course_list, many=True) #开始序列化

            response.data = course_ser.data     #返回序列化好的数据

        except Exception as e:
            response.status = 105
            response.msg = str(e)
            # response.msg = '您的操作有误'

        return Response(response.get_dic)

    #单个课程详情接口
    def get_detail(self, request, pk):
        response = LuffyResponse()
        try:
            #注意：用course_id来查询
            course_detail=models.CourseDetail.objects.get(course_id=pk)
            course_detail_ser=CoursesDetailSerializers(instance=course_detail,many=False)

            response.data=course_detail_ser.data
            response.msg='查询成功'

        except ObjectDoesNotExist as e:
            response.status = 101
            response.msg = '课程不存在'
        except Exception as e:
            response.status = 105
            response.msg = str(e)
            # response.msg = '您的操作有误'

        return Response(response.get_dic)

from django.conf.urls import url
from django.contrib import admin
from api.views import course,login
from django.views.static import serve
from luffy_city import settings
urlpatterns = [
    url(r'^admin/', admin.site.urls),
    url(r'^courses/$', course.CourseView.as_view({'get':'get_list'})),
    url(r'^login/$', login.LoginView.as_view()),
    url(r'^courses/(?P<pk>\d+)', course.CourseView.as_view({'get':'get_detail'})),
    url(r'^media/(?P<path>.*)', serve,{'document_root':settings.MEDIA_ROOT}),


]

#注意: 使用了 ViewSetMixin 模块,就需要写 as_view({'get':'get_list'}) 模式里面需要传入字典来实现