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

1class Test1(models.Model):
2    id = models.IntegerField(primary_key=True)
3    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
4
5class Test2(models.Model):
6    id = models.IntegerField(primary_key=True)
7    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

1#对于test1添加方法
2class Test1(models.Model):
3    id = models.IntegerField(primary_key=True)
4    test_2_id= models.ForeignKey(to='Test2',on_delete='id')
5    @property
6    def get_test2_name(self):
7        return self.test_2_id.name

views.py

1from rest_framework.serializers import ModelSerializer
2from app.models import Test1
3class Test_ser(ModelSerializer):
4    class Meta:
5        model = Test1  # 这里会把Test1面的所有名称空间存在的都进行导入
6        fields = ('id','get_test2_name')
7
8class Test(APIView):
9    def get(self,request):
10        test1_objs = Test1.objects.all()
11        test1_ser = Test_ser(instance=test1_objs,many=True).data
12        for a in test1_ser:
13            print(a)
14        return HttpResponse('ok')

方法二

views.py

1from rest_framework.serializers import ModelSerializer
2from app.models import Test1,Test2
3
4
5class Test_2_ser(ModelSerializer):
6    class Meta:
7        model = Test2
8        fields = '__all__'
9
10class Test_ser(ModelSerializer):
11    test_2_id = Test_2_ser()  #test_2_id为Test1与Test2关联的字段
12    class Meta:
13        model = Test1  
14        fields = '__all__'
15
16class Test(APIView):
17    def get(self,request):
18        test1_objs = Test1.objects.all()
19        test1_ser = Test_ser(instance=test1_objs,many=True).data
20        for a in test1_ser:
21            print(a)
22        return HttpResponse('ok')

方法三

1#通过添加自定义字段
2class Test_ser(ModelSerializer):
3    test_2_name = SerializerMethodField() #自定义字段名称
4    def get_test_2_name(self,model):  #这里方法名必须get_字段名称
5        return model.test_2_id.name    #对于获取字段后的返回值
6    class Meta:
7        model = Test1  
8        fields = '__all__'
9
10class Test(APIView):
11    def get(self,request):
12        test1_objs = Test1.objects.all()
13        test1_ser = Test_ser(instance=test1_objs,many=True).data
14        for a in test1_ser:
15            print(a)
16        return HttpResponse('ok')

方法四

1#通过添加自定义字段
2class Test_ser(ModelSerializer):
3    image_url=serializers.CharField(source='test_2_id.name') #test1中的test_2_id.name的内容
4    class Meta:
5        model = Test1  
6        fields = '__all__'
7
8class Test(APIView):
9    def get(self,request):
10        test1_objs = Test1.objects.all()
11        test1_ser = Test_ser(instance=test1_objs,many=True,context={"request":request}).data
12        for a in test1_ser:
13            print(a)
14        return HttpResponse('ok')