severe issue: Getting 415 HTTP code when retrieving task

[baibinghere]

After installing this plugin, I'm not able to perform the following operation:

GET http://192.168.116.135:5000/api/project/1/newtask?offset=0&_=1501769112591 415 (UNSUPPORTED MEDIA TYPE)

Root Cause Analysis:
As I have checked, the error is thrown at:
api/init.py:188

    task = sched.new_task(project_id, project.info.get('sched'),
                          user_id,
                          user_ip,
                          external_uid,
                          offset,
                          limit,
                          orderby=orderby,
                          desc=desc)

Throwing below error message:

wrapper() takes at most 5 arguments (9 given)

Prototype of new_task in sched.py:

def new_task(project_id, sched, user_id=None, user_ip=None,
             external_uid=None, offset=0, limit=1, orderby='priority_0', desc=True):

In the plugin, the new_task function has been reassigned:

        sched.new_task = with_random_scheduler(sched.new_task)

But with_random_scheduler's wrapper only takes 5 arguments:

def with_random_scheduler(f):
    @wraps(f)
    def wrapper(project_id, sched, user_id=None, user_ip=None, offset=0):
        if sched == SCHEDULER_NAME:
            return get_random_task(project_id, user_id, user_ip, offset=offset)
        return f(project_id, sched, user_id=user_id, user_ip=user_ip, offset=offset)
    return wrapper

Basically, I made the below changes to make it work, I'm sure it's just a workaround:

--- pybossa/plugins/random-scheduler/__init__.py	(revision )
+++ pybossa/plugins/random-scheduler/__init__.py	(revision )
@@ -16,14 +16,15 @@
     """Return a random task for the user."""
     project = project_repo.get(project_id)
     if project and len(project.tasks) > 0:
-        return random.choice(project.tasks)
+        return [random.choice(project.tasks)]
     else:
-        return None
+        return []
 
 
 def with_random_scheduler(f):
     @wraps(f)
-    def wrapper(project_id, sched, user_id=None, user_ip=None, offset=0):
+    def wrapper(project_id, sched, user_id=None, user_ip=None,
+                external_uid=None, offset=0, limit=1, orderby='priority_0', desc=True):
         if sched == SCHEDULER_NAME:
             return get_random_task(project_id, user_id, user_ip, offset=offset)
         return f(project_id, sched, user_id=user_id, user_ip=user_ip, offset=offset)

[ghaimov]

Hey,
Thanks for the example!

Also, In order to actually get only the tasks that are ongoing, I added another filter (another workaround) to handle this:

def get_random_task(project_id, user_id=None, user_ip=None,n_answers=30, offset=0):
    """Return a random task for the user."""
    project = project_repo.get(project_id)
    if project and len(project.tasks) > 0:
        ongoing_tasks = [task for task in project.tasks if task.state=='ongoing']
        return [random.choice(ongoing_tasks)]
    else:
        return []