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Module: Events Organization

Entity: event.event

Compute Method: _compute_event_slot_count

Inputs Method Outputs 
slot_count_per_event = dict(self.env['event.slot']._read_group(
            domain=[('event_id', 'in', self.ids)],
            groupby=['event_id'],
            aggregates=['__count']
        ))
for event in self:
            event.event_slot_count = slot_count_per_event.get(event, 0)

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