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[Bug 582620] Re: sometimes task is removed before task-deleted signal handler is executed

 

GTG/taskbrowser/tasktree.py

One is this:
delete a task and its subtask at the same time


Traceback (most recent call last):
  File "/home/luca/Projects/gtg/TRUNK/GTG/viewmanager/delete_dialog.py", line 42, in on_delete_confirm
    self.req.delete_task(tid)
  File "/home/luca/Projects/gtg/TRUNK/GTG/core/requester.py", line 208, in delete_task
    for tag in task.get_tags():
AttributeError: 'NoneType' object has no attribute 'get_tags'

Another one is that in tagtree.py, at update_tag_task_deleted() (which updates the tags upon the deletion of a task):
if tasks_count <= 1 sometimes fail because the task has already been deleted.

The  problem is that we cannot know what the current state is (task has
been already deleted or not?)

-- 
sometimes task is removed before task-deleted signal handler is executed
https://bugs.launchpad.net/bugs/582620
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Status in Getting Things GNOME!: Confirmed

Bug description:
Signals are executed when "there is time for them", without specific limits.

Now, when we issue the signal task-deleted, we should do a series of things (updating tags in the tag pane, removing the task and its children from the main view...).
A number of times we need to access information about the task that has been removed. Example: we need to check if the tag that we are updating in the tags pane should be shown or not (are there still tasks tagged with that?)

This causes a series of problems, among which the drag and drop "phantom tasks" (tasks that are shown twice), or crashes upon deletion of tasks because the signal arrived too late and we cannot get the list of tags that need to be updated.

How to solve this?instead of passing the tid along with the signal, I think we should pass a copy of the whole task.
I understand there are a series of things that need to be well thought out also with this approach and, since it's late and tomorrow is GTG Regression day, i'll regress to bed.





References