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wo_data = self.env['mrp.workorder']._read_group([
('date_start', '>=', fields.Datetime.to_string(datetime.now() - relativedelta.relativedelta(months=1))),
('workcenter_id', 'in', self.ids),
('state', '=', 'done')], ['workcenter_id'], ['duration_expected:sum', 'duration:sum'])
duration_expected = {workcenter.id: expected for workcenter, expected, __ in wo_data}
duration = {workcenter.id: duration for workcenter, __, duration in wo_data}
for workcenter in self:
if duration.get(workcenter.id):
workcenter.performance = 100 * duration_expected.get(workcenter.id, 0.0) / duration[workcenter.id]
else:
workcenter.performance = 0.0
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