Call Django Class based view function with Django-Q's async_task

I can’t call async_task on a Django class based view function. Considering following case, where I have a DRF view:

class Greeter(generics.GenericAPIView)

    def greet(self, name):
        print("Hello: ")
        sleep(5)
        print(name)

    def post(self, request, *args, **kwargs):
        # enqueue the task
        async_task(self.greet, "world")

        return Response(
            {"message": "you should see this right away"}, status=status.HTTP_200_OK
        )

When trying to call async_task on a Django class based view function, following errors occur:

• async_task(self.greet) returns an cannot pickle '_io.BufferedReader' object error
• async_task("self.greet") returns an No module named 'self' error

I have no issues when putting the greet function outside de class.

edit: correcting function names

[Koed00]

Just create a separate task for this:

ie

def print_test(test: Test): return test.print_test()

and then async this function with the Test() instance

async_task(my_module.tasks.print_test, Test())

Only the arguments can be instances and will be serialized.

On Wed, Aug 12, 2020 at 10:25 AM mostafa khaki [e-mail] wrote:

hi how in case that we need to create an instance of an object then pass that function from the instance, set that function to async_task? ex: async_task(Test().print_test) but error some pickle error

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[rafael-h-ferreira]

I too have a class with many static methods and I wish to call the class functions. Instead of creating one separate task for each class function, I created one task that will run the class functions:

from my_proj import ProjClass
def run_task(class_static_method: str, *args, **kwargs):
    func = getattr(ProjClass, class_static_method)
    return func(*args, **kwargs)

Then you may call it like:

async_task("my_proj.run_task", "class_static_function", arg1)

Of course, if you need a class instance you need to instantiate it first in the run_task. If you also need to pass class args, you probably need a dict arg for the class args and other for the function args.