+
−from django.http import Http404
+
−from pytask.taskapp.models import Task, Map
+
−
+
−def getTask(tid):
+
−    """ retreive the task from database.
+
−    if the task has deps or subs, update its status correspondingly.
+
−    """
+
−
+
−    try:
+
−        task = Task.objects.get(id=tid)
+
−    except Task.DoesNotExist:
+
−        raise Http404
+
−    try:
+
−        mapobj = Map.objects.get(main=task)
+
−    except Map.DoesNotExist:
+
−        mapobj = Map()
+
−        mapobj.main = task
+
−        mapobj.save()
+
−        
+
−    task_subs = mapobj.subs.all()
+
−
+
−    if task.sub_type == "D":
+
−        task.deps, task.subs = task_subs, []
+
−    elif task.sub_type == "S":
+
−        task.subs, task.deps = task_subs, []
+
−
+
−    deps, subs = task.deps, task.subs
+
−    if deps and task.status in ["OP", "LO"]:
+
−        task.status = "OP" if all(map(lambda t:t.status=="CM",deps)) else "LO"
+
−
+
−    ## a task with subs will remain in "LO" and will be made "OP" only if all subs are removed.
+
−    if subs and task.status in ["OP", "LO"]:
+
−        task.status = "LO"
+
−
+
−    task.save()
+
−    return task
+
−