如何使用模型的功能？

Question

I have a TypeModel model, and in it there is a :

class TypeModel(models.Model):
    name = models.CharField(max_length=22)
    type = models.CharField(max_length=12)
    ch = models.CharField(max_length=44, null=True)

    def print(self, name, type):
        t = TypeModel.objects.create(name=name, type=type)
        print('success - ' + t.name)

I want to invoke the print method like this:

class TypeModelCreateAPIView(APIView):
    permission_classes = [AllowAny]
    def post(self, request):

        TypeModel.print() # Can I invoke like this
        return Response(status=HTTP_200_OK, data='')

Whether I can invoke the function of model like this? if not, how to realize the Class method of model?

Answer 1

You can use staticmethod:

@staticmethod
def print(name, type):
    t = TypeModel.objects.create(name=name, type=type)
    print('success - ' + t.name)

Answer 2

Yes, this can be done with the staticmethod annotation

class TypeModel(models.Model):
    name = models.CharField(max_length=22)
    type = models.CharField(max_length=12)
    ch = models.CharField(max_length=44, null=True)

    @staticmethod
    def print(name, type):
        t = TypeModel.objects.create(name=name, type=type)
        print('success - ' + t.name)    

Please note, that a static method does not have the implicit self as first argument.

Answer 3

Currently print is defined as an instance method. You would have to create an instance of TypeModel to call it. Like:

model = TypeModel()
model.print()

Or you could use the @staticmethod decorator:

@staticmethod
def print(name, type):
    t = TypeModel.objects.create(name=name, type=type)
    print('success - ' + t.name)