1 from django.http import Http404

     2 from pytask.taskapp.models import Task, Map

     3 

     4 def getTask(tid):

     5     """ retreive the task from database.

     6     if the task has deps or subs, update its status correspondingly.

     7     """

     8 

     9     try:

    10         task = Task.objects.get(id=tid)

    11     except Task.DoesNotExist:

    12         raise Http404

    13     try:

    14         mapobj = Map.objects.get(main=task)

    15     except Map.DoesNotExist:

    16         mapobj = Map()

    17         mapobj.main = task

    18         mapobj.save()

    19         

    20     task_subs = mapobj.subs.all()

    21 

    22     if task.sub_type == "D":

    23         task.deps, task.subs = task_subs, []

    24     elif task.sub_type == "S":

    25         task.subs, task.deps = task_subs, []

    26 

    27     deps, subs = task.deps, task.subs

    28     if deps and task.status in ["OP", "LO"]:

    29         task.status = "OP" if all(map(lambda t:t.status=="CM",deps)) else "LO"

    30 

    31     ## a task with subs will remain in "LO" and will be made "OP" only if all subs are removed.

    32     if subs and task.status in ["OP", "LO"]:

    33         task.status = "LO"

    34 

    35     task.save()

    36     return task

    37