python序列化

Posted 2021-02-08 veiyg

import json
json.JSONEncoder
点进去 python原生支持的序列化类型
class JSONEncoder(object):

    +-------------------+---------------+
    | Python            | JSON          |
    +===================+===============+
    | dict              | object        |
    +-------------------+---------------+
    | list, tuple       | array         |
    +-------------------+---------------+
    | str               | string        |
    +-------------------+---------------+
    | int, float        | number        |
    +-------------------+---------------+
    | True              | true          |
    +-------------------+---------------+
    | False             | false         |
    +-------------------+---------------+
    | None              | null          |
    +-------------------+---------------+

"""

Django


# 方式一：

# url(r‘^course/$‘, course.CourseView.as_view()),
# url(r‘^course/(?P<pk>d+)/$‘, course.CourseView.as_view()),

# class CourseView(APIView):
#
#     def get(self,request,*args,**kwargs):
#
#         ret = {‘code‘:1000,‘data‘:None}
#
#         try:
#             pk = kwargs.get(‘pk‘)
#             if pk:
#                 obj = models.Course.objects.filter(id=pk).first()
#                 ser = CourseSerializer(instance=obj,many=False)
#             else:
#                 queryset = models.Course.objects.all()
#                 ser = CourseSerializer(instance=queryset,many=True)
#             ret[‘data‘] = ser.data
#         except Exception as e:
#             ret[‘code‘] = 1001
#             ret[‘error‘] = ‘获取课程失败‘
#
#         return Response(ret)

# 方式二 带参数 pk的详情
"""

class ViewSetMixin(object):支持的as_view

view = MyViewSet.as_view({‘get‘: ‘list‘, ‘post‘: ‘create‘})
"""

url(r‘^course/$‘, course.CourseView.as_view({‘get‘:‘list‘})),
url(r‘^course/(?P<pk>d+)$‘, course.CourseView.as_view({‘get‘:‘retrieve‘})),

from rest_framework.views import APIView
from rest_framework.response import Response
from api import models
from rest_framework.viewsets import GenericViewSet,ViewSetMixin
from api.serializers.course import CourseSerializer,CourseDetailSerializer


class CourseView(ViewSetMixin,APIView):

    def list(self,request,*args,**kwargs):
        """
        课程列表接口
        :param request:
        :param args:
        :param kwargs:
        :return:
        """
        ret = {‘code‘:1000,‘data‘:None}

        try:
            queryset = models.Course.objects.all()
            ser = CourseSerializer(instance=queryset,many=True)
            ret[‘data‘] = ser.data
        except Exception as e:
            ret[‘code‘] = 1001
            ret[‘error‘] = ‘获取课程失败‘

        return Response(ret)

    def retrieve(self,request,*args,**kwargs):
        """
        课程详细接口
        :param request:
        :param args:
        :param kwargs:
        :return:
        """
        ret = {‘code‘: 1000, ‘data‘: None}

        try:
            # 课程ID=2
            pk = kwargs.get(‘pk‘)

            # 课程详细对象
            obj = models.CourseDetail.objects.filter(course_id=pk).first()

            ser = CourseDetailSerializer(instance=obj,many=False)

            ret[‘data‘] = ser.data

        except Exception as e:
            ret[‘code‘] = 1001
            ret[‘error‘] = ‘获取课程失败‘

        return Response(ret)

serializers/course.py

from api import models

from rest_framework import serializers

class CourseSerializer(serializers.ModelSerializer):
    """
    课程序列化
    """
    level = serializers.CharField(source=‘get_level_display‘)
    class Meta:
        model = models.Course
        fields = [‘id‘,‘title‘,‘course_img‘,‘level‘]


class CourseDetailSerializer(serializers.ModelSerializer):
    """
    课程详细序列化
    """
    # one2one/fk/choice
    title = serializers.CharField(source=‘course.title‘)
    img = serializers.CharField(source=‘course.course_img‘)
    level = serializers.CharField(source=‘course.get_level_display‘)


    # m2m
    recommends = serializers.SerializerMethodField()
    chapter = serializers.SerializerMethodField()


    class Meta:
        model = models.CourseDetail
        fields = [‘course‘,‘title‘,‘img‘,‘level‘,‘slogon‘,‘why‘,‘recommends‘,‘chapter‘]


    def get_recommends(self,obj):
        # 获取推荐的所有课程
        queryset = obj.recommend_courses.all()

        return [{‘id‘:row.id,‘title‘:row.title} for row in queryset]

    def get_chapter(self,obj):
        # 获取推荐的所有课程
        queryset = obj.course.chapter_set.all()

        return [{‘id‘:row.id,‘name‘:row.name} for row in queryset]