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| before_save :adjust_parts_qty | |
| before_destroy :adjust_parts_qty | |
| private | |
| def adjust_parts_qty | |
| old_quantity = quantity_was || 0 | |
| new_quantity = marked_for_destruction? ? 0 : quantity | |
| part.quantity += new_quantity - old_quantity | |
| part.save! | |
| end |
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