lf 前后端分离 (2) 课程数据获取,Serializer的返回

一.关于课程数据的返回

在进行前后端分离时,会通过def 进行前后端传值,

本质上遵循rest 网址规范  增删改查查 get,post,put,del get(\d+)

1.在从数据库获取数据后,进行def 发送ajax数据,

通过from rest_framework import serializers

快速获取数据,在 class CourseSerializer(serializers.ModelSerializer)中

level = serializers.CharField(source="get_level_display")为获取的一对多的关联数据库的具体字段,不加source会直接显示_id

在进行choice字段时,为了显示文字,采用

level = serializers.CharField(source="course.get_level_display")

在进行多对多字段时,需要自定义方法,遵循

recommend_coursesinfo = serializers.SerializerMethodField()
通过循环,所关联的全部字段,打印出要获取的值,注意,当字段函数与返回值同名时,会覆盖

from django.shortcuts import render
from rest_framework import serializers

from app01.models import *


class CourseSerializer(serializers.ModelSerializer):
    class Meta:
        model = Course
        fields = "__all__"

    level = serializers.CharField(source="get_level_display")
    coursedetail_id = serializers.CharField(source="coursedetail.pk")


class CourseDetailSerializer(serializers.ModelSerializer):
    class Meta:
        model = CourseDetail
        fields = "__all__"

    name = serializers.CharField(source="course.name")
    prices = serializers.SerializerMethodField()
    brief = serializers.CharField(source="course.brief")
    study_all_time = serializers.StringRelatedField(source='hours')
    level = serializers.CharField(source="course.get_level_display")
    teacher = serializers.SerializerMethodField()
    is_online = serializers.CharField(source="course.get_status_display")
    recommend_coursesinfo = serializers.SerializerMethodField()

    def get_prices(self,instance):
        return [{"price": obj.price,
                 "valid_period": obj.valid_period,
                 "valid_period_text": obj.get_valid_period_display(),
                 "id": obj.pk,
                 }for obj in instance.course.price_policy.all()]

    def get_teacher(self, instance):
        return [{"name": obj.name,
                 "image": obj.image}for obj in instance.teachers.all()]

    def get_recommend_coursesinfo(self, instance):
        return [{"name": obj.name,
                 "pk": obj.pk} for obj in instance.recommend_courses.all()]

并且返回的数据需要与前端vue匹配,跨

from django.shortcuts import render

from app01 import models
from app01.utils.auth import LoginAuth

from rest_framework.response import Response
from rest_framework.views import APIView

from serializer.views import CourseSerializer, CourseDetailSerializer


class CourseViews(APIView):
    authentication_classes = [LoginAuth]

    def get(self, request):
        course = models.Course.objects.all()
        data = CourseSerializer(course, many=True)
        res = {"error_no": 0, "data": data.data}
        return Response(res)


class CourseDetailViews(APIView,):

    authentication_classes = [LoginAuth]

    def get(self, request, pk):
        coursedetail = models.CourseDetail.objects.get(pk=pk)
        data = CourseDetailSerializer(coursedetail, many=False)
        res = {"error_no": 0, "data": data.data}
        return Response(res)

 

其他详见