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  • DRF框架中链表数据通过ModelSerializer深度查询方法汇总

    DRF框架中链表数据通过ModelSerializer深度查询方法汇总

    一.准备测试和理解准备

    创建类

    class Test1(models.Model):
        id = models.IntegerField(primary_key=True)
        test_2_id= models.ForeignKey(to='Test2',on_delete='id') #这里有的创建失败了哈哈忘了会自动补全id
    
    class Test2(models.Model):
        id = models.IntegerField(primary_key=True)
        name = models.CharField(max_length=60)
    

    生成表单数据

    Test1

    id test_2_id_id
    1 1
    2 2

    Test2

    id name
    1 名字1
    2 名字2

    二.深度查询通过Test1获得Test2的name而不是id

    方法一

    models.py

    #对于test1添加方法
    class Test1(models.Model):
        id = models.IntegerField(primary_key=True)
        test_2_id= models.ForeignKey(to='Test2',on_delete='id')
        @property
        def get_test2_name(self):
            return self.test_2_id.name
    

    views.py

    from rest_framework.serializers import ModelSerializer
    from app.models import Test1
    class Test_ser(ModelSerializer):
        class Meta:
            model = Test1  # 这里会把Test1面的所有名称空间存在的都进行导入
            fields = ('id','get_test2_name')
    
    class Test(APIView):
        def get(self,request):
            test1_objs = Test1.objects.all()
            test1_ser = Test_ser(instance=test1_objs,many=True).data
            for a in test1_ser:
                print(a)
            return HttpResponse('ok')
    

    方法二

    views.py

    from rest_framework.serializers import ModelSerializer
    from app.models import Test1,Test2
    
    
    class Test_2_ser(ModelSerializer):
        class Meta:
            model = Test2
            fields = '__all__'
    
    class Test_ser(ModelSerializer):
        test_2_id = Test_2_ser()  #test_2_id为Test1与Test2关联的字段
        class Meta:
            model = Test1  
            fields = '__all__'
    
    class Test(APIView):
        def get(self,request):
            test1_objs = Test1.objects.all()
            test1_ser = Test_ser(instance=test1_objs,many=True).data
            for a in test1_ser:
                print(a)
            return HttpResponse('ok')
    

    方法三

    #通过添加自定义字段
    class Test_ser(ModelSerializer):
        test_2_name = SerializerMethodField() #自定义字段名称
        def get_test_2_name(self,model):  #这里方法名必须get_字段名称
            return model.test_2_id.name    #对于获取字段后的返回值
        class Meta:
            model = Test1  
            fields = '__all__'
    
    class Test(APIView):
        def get(self,request):
            test1_objs = Test1.objects.all()
            test1_ser = Test_ser(instance=test1_objs,many=True).data
            for a in test1_ser:
                print(a)
            return HttpResponse('ok')
    

    方法四

    #通过添加自定义字段
    class Test_ser(ModelSerializer):
        image_url=serializers.CharField(source='test_2_id.name') #test1中的test_2_id.name的内容
        class Meta:
            model = Test1  
            fields = '__all__'
    
    class Test(APIView):
        def get(self,request):
            test1_objs = Test1.objects.all()
            test1_ser = Test_ser(instance=test1_objs,many=True,context={"request":request}).data
            for a in test1_ser:
                print(a)
            return HttpResponse('ok')
    
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  • 原文地址:https://www.cnblogs.com/pythonywy/p/11587572.html
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