#rest_framework 序列化
from rest_framework import serializers#serilizers.Serializer serializers.ModelSerializer 两种序列化方式class RolesSerializer(serializers.Serializer):id = serializers.IntegerField()title = serializers.CharField()class RolesView(APIView):def get(self, request, *args, **kwargs):#方式1#roles = models.Role.objects.all().values('id','title')#roles = list(roles)#ret = json.dumps(roles, ensure_ascii=False)#方式2-1roles = models.Role.objects.all()ser = RolesSerializer(instance=roles, many=True)ret = json.dumps(ser.data, ensure_ascii=False)return HttpResponse(ret)#方式2-2roles = models.Role.objects.all().first()ser = RolesSerializer(instance=roles, many=False)ret = json.dumps(ser.data, ensure_ascii=False)return HttpResponse(ret)class UserInfoSerializer(serializers.Serializer):username = serializer.CharField()password = serializer.CharField()user_type = serializer.IntegerField()#user_type = serializer.Charield(source="get_user_type_display")  #找到每一行的对象 row.user_type# row.get_user_type_display  就可以对choices进行层级的字符#可执行gp = serializers.CharField(source="group.title")  #外键group关联Group表，通过.获取Group表字段参数#显示 [{"username":"ljc", "password":"123", "user_type":"VIP", "gp":"A组"}]#多对多 manytomany 不能通过source  通过serializers.SerializerMethodField()roles = serializers.SerializerMethodField() #自定义显示def get_roles(self, row):role_obj_list = row.roles.all() #获取角色对象ret = []for item in role_obj_list:ret.append({'id':item.id, 'title':item.title})return retclass UserInfoView(APIView):def get(self, request, *args, **kwargs):users = models.UserInfo.objects.all()ser = UserInfoSerializer(instance=users, many=True)ret = json.dumps(ser.data, ensure_ascii=False)return HttpResponse(ret)#方式3
class UserInfoSerializer(serializers.ModelSerializer):user_type = serializer.Charield(source="get_user_type_display")  #混合使用roles = serializers.SerializerMethodField() #自定义显示class Meta:model = models.UserInfo#fields = "__all__"  全部自动生成#fields = ['id', 'username', 'password'] #自定义#fields = ['id', 'username', 'password', 'user_type']fields = ['roles'] #复杂的def get_roles(self, row):role_obj_list = row.roles.all() #获取角色对象ret = []for item in role_obj_list:ret.append({'id':item.id, 'title':item.title})class UserInfoView(APIView):def get(self, request, *args, **kwargs):users = models.UserInfo.objects.all()ser = UserInfoSerializer(instance=users, many=True)ret = json.dumps(ser.data, ensure_ascii=False)return HttpResponse(ret)#小清新版
class UserInfoSerializer(serializers.ModelSerializer):class Meta:model = models.UesrInfofields = "__all__"depth = 1  #这个就可以将所有的数据都显示了  默认为0 只是关联本表的数据 depth最好0-4层就好了#表与表之间的manytomany onetoone foreignkey 表示一层 第二个表再关联 就2层  连表操作
class UserInfoView(APIView):def get(self, request, *args, **kwargs):users = models.UserInfo.objects.all()ser = UserInfoSerializer(instance=users, many=True)ret - json.dumps(ser.data, ensure_ascii=False) #ensure_ascii=False 显示中文return HttpResponse(ret)