如何在 Django Rest Framework 中为一个模型添加其他字段，该模型是另一个模型的外键

Question

我想在 Django 休息框架中列出某个部门的所有教师，但不确定如何这样做。我相信这可以通过向 Department 序列化程序添加一个字段来完成，但我不确定。有没有简单的方法可以做到这一点。

models.py

   class Department(models.Model):
       name = models.CharField(max_length=300)
    
        def __str__(self):
            return self.name
    
    
    class Teacher(models.Model):
        name = models.CharField(max_length=300)
        department = models.ForeignKey(Department, on_delete=models.CASCADE)
        tenure = models.BooleanField()

serializers.py

class DepartmentSerializer(serializers.HyperlinkedModelSerializer):
    #What I believe the serializer field would look like to list teachers connected 
    #with a department
    teacher = serializers.DjangoModelField(
        Teacher.objects.filter(department=self.department))

    class Meta:
        model = Department
        fields = ['url', 'name', 'teacher']

urls.py

router = DefaultRouter()
router.register(r'teachers', TeacherViewSet)
router.register(r'departments', DepartmentViewSet)
router.register(r'users', UserViewSet)

urlpatterns = [
    path('api/', include(router.urls)),
]

views.py

class TeacherViewSet(viewsets.ModelViewSet):
    queryset = Teacher.objects.all()
    serializer_class = TeacherSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]


class DepartmentViewSet(viewsets.ModelViewSet):
    queryset = Department.objects.all()
    serializer_class = DepartmentSerializer
    permission_classes = [permissions.IsAuthenticatedOrReadOnly]

Answer 1

您可以使用 mydepartment.teacher_set.all() 访问链接到 department 的 Teacher，我们可以在序列化程序中使用它，例如：

class <strong>TeacherSerializer</strong>(serializers.HyperlinkedModelSerializer):
    class Meta:
        model = Teacher
        fields = ['name', 'tenure']

class DepartmentSerializer(serializers.HyperlinkedModelSerializer):
    <strong>teacher_set = serializers.TeacherSerializer(many=True)</strong>

    class Meta:
        model = Department
        fields = ['url', 'name', 'teacher_set']

如何在 Django Rest Framework 中为一个模型添加其他字段，该模型是另一个模型的外键

How to add additional field in Django Rest Framework for a model that is a foreign key on another model

python

django

django-rest-framework