50 lines
1.2 KiB
Go
50 lines
1.2 KiB
Go
package main
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import (
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"fmt"
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messages "git.tornberg.me/go-cart-actor/pkg/messages"
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)
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// mutation_remove_item.go
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//
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// Registers the RemoveItem mutation.
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//
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// Behavior:
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// - Removes the cart line whose local cart line Id == payload.Id
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// - If no such line exists returns an error
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// - Recalculates cart totals (WithTotals)
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//
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// Notes:
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// - This removes only the line item; any deliveries referencing the removed
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// item are NOT automatically adjusted (mirrors prior logic). If future
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// semantics require pruning delivery.item_ids you can extend this handler.
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// - If multiple lines somehow shared the same Id (should not happen), only
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// the first match would be removed—data integrity relies on unique line Ids.
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func init() {
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RegisterMutation[messages.RemoveItem](
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"RemoveItem",
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func(g *CartGrain, m *messages.RemoveItem) error {
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if m == nil {
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return fmt.Errorf("RemoveItem: nil payload")
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}
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targetID := int(m.Id)
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index := -1
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for i, it := range g.Items {
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if it.Id == targetID {
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index = i
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break
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}
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}
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if index == -1 {
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return fmt.Errorf("RemoveItem: item id %d not found", m.Id)
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}
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g.Items = append(g.Items[:index], g.Items[index+1:]...)
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return nil
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},
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WithTotals(),
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)
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}
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