Allow promotion calculators to set dynamic adjustment labels#6398
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Prior to this, the `adjustment_label` method on
`SolidusPromotions::Benefit` could only output a relatively static
string. This commit allows calculators to define one of these methods:
- `#line_item_adjustment_label(line_item, options = {})`
- `#shipment_adjustment_label(shipment, options = {})`
- `#shipping_rate_adjustment_label(shipping_rate, options = {})`
- `#price_adjustment_label(price, options = {})`
These have access to the inner workings of the calculator, so they can
provide dynamic labels (to reflect e.g. which tier a promotion chooses,
making that transparent to the customer.
If a promotion calculator implements a dynamic
`#{adjustable}_adjustment_label` method, we need to update the
adjustment label when it changes. This makes sure that is the case.
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tvdeyen
approved these changes
Dec 22, 2025
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Summary
This allows promotion calculators to compute labels for promotion adjustments based on properties of the item in question. This allows for example to have a different label if the quantity of a line item changes (interesting for quantity-based discounts).
Because those labels are now potentially more dynamic, we let the order adjuster update adjustment labels along with amounts.
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