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Module: Inventory

Entity: stock.lot

Compute Method: _compute_is_scrap

Inputs Method Outputs 
grouped_move_lines = self.env['stock.move.line']._read_group([('lot_id', 'in', self.ids), ('is_scrap', '=', True)], ['lot_id'], ['id:recordset'])
move_lines_by_lot = dict(grouped_move_lines)
for lot in self:
            lot.is_scrap = bool(move_lines_by_lot.get(lot))

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