Wait for background task to complete?

[anthonys]

@lab

   body = anvil.server.request.body_json
   bg = anvil.server.launch_background_task("getDetails", body, datetime.today())
   if bg.is_completed():
      values = bg.get_return_value()
      print(values) #check
      #other stuff that wasn't firing

This looks like you’re checking if the task was complete immediately after creating the task. This will certainly return false.

You can set up a while loop to check if the task is complete, but that will hang up any caller waiting for a response from your api. If you’re using this on the client side, I often set up a time to check the status on task, on a routine.

discussion of that touches the subject here:

Returning List of Media Objects From Background Task

What I’m trying to do: I am trying to run a background task which processes data table rows and generates pdf invoices to be downloaded later. However my list of media objects are not being serialised properly. What I’ve tried and what’s not working: The task is completing ,but I am receiving a serialization error when attempting to retrieve the return object of the task ( which should be a list of media objects). Return Object This is a print statement of the return object in the backgroun…