def linkTasksToGoal(request, goal, profile):
# Create the form and calculate the choices
form = forms.GoalTaskLinkForm()
taskList = Task.all().ancestor(profile).filter('Unit =', goal.Unit)
form.TaskList.choices = [(t.key().id(), t.Name) for t in taskList]
taskLinks = TaskLink.all().ancestor(goal)
selectedTasks = set([link.Task.key().id() for link in taskLinks])
if request.method == 'POST' and form.validate():
for value, label, selected in form.TaskList.iter_choices():
task = Task.get_by_id(value, profile)
if value in selectedTasks:
if not selected:
# Delete the task link
oldLink = TaskLink.all().ancestor(goal).filter('Task =', task).get()
if oldLink:
oldLink.delete()
else:
if selected:
# Create the task link
newLink = TaskLink(parent = goal, Task = task)
newLink.put()
return redirect(url_for('goal', id = goal.key().id()))
else:
form.TaskList.data = selectedTasks
return render_template("views/goal_link.html", goal = goal, form = form)
