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if not any(self._ids):
for milestone in self:
milestone.can_be_marked_as_done = not milestone.is_reached and all(milestone.task_ids.mapped(lambda t: t.is_closed))
return
unreached_milestones = self.filtered(lambda milestone: not milestone.is_reached)
(self - unreached_milestones).can_be_marked_as_done = False
task_read_group = self.env['project.task']._read_group(
[('milestone_id', 'in', unreached_milestones.ids)],
['milestone_id', 'state'],
['__count'],
)
task_count_per_milestones = defaultdict(lambda: (0, 0))
for milestone, state, count in task_read_group:
opened_task_count, closed_task_count = task_count_per_milestones[milestone.id]
if state in CLOSED_STATES:
closed_task_count += count
else:
opened_task_count += count
task_count_per_milestones[milestone.id] = opened_task_count, closed_task_count
for milestone in unreached_milestones:
opened_task_count, closed_task_count = task_count_per_milestones[milestone.id]
milestone.can_be_marked_as_done = closed_task_count > 0 and not opened_task_count
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