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Module: Maintenance

Entity: maintenance.equipment.category

Compute Method: _compute_maintenance_count

Inputs Method Outputs 
maintenance_data = self.env['maintenance.request']._read_group([('category_id', 'in', self.ids)], ['category_id', 'state'], ['__count'])
mapped_data = {(category.id, state): count for category, state, count in maintenance_data}
for category in self:
            category.maintenance_open_count = sum(mapped_data.get((category.id, state), 0) for state in ['normal', 'changes_requested', 'approved'])
            category.maintenance_count = category.maintenance_open_count + sum(mapped_data.get((category.id, state), 0) for state in ['done', 'cancelled'])

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