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Fix Spree::Shipment#item_cost for split shipments #18

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@DanielePalombo DanielePalombo commented Oct 19, 2018

This PR is going to fix the bug reported here solidusio#2919.

Now when shipment is split, it creates two shipment but associated
line_item has quantity 2 which is resulting in incorrect item_cost
because it is taken from line_item not from shipment.
Shipment manifest know the right quantity for every shipment, use it to
calculate the item_cost as sum of

(single_line item + weighted adjustment per line item) * quantity

@@ -141,6 +141,26 @@
it 'should equal line items final amount with tax' do
expect(shipment.item_cost).to eql(11.0)
end

context 'whit more shipments for the same line_item' do
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Small typo in here, should be with instead of whit

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@DanielePalombo thank you for the fix! 👏 🎉

I left a comment, only a minor suggestion.

@@ -186,7 +186,7 @@ def inventory_units_for_item(line_item, variant = nil)
end

def item_cost
line_items.map(&:total).sum
manifest.map { |m| (m.line_item.price + (m.line_item.adjustment_total / m.line_item.quantity)) * m.quantity }.sum
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I confess it was hard for me to understand this line. I think that expanding the block to multiple lines and adding a temporary variable may improve understandability also for other people that don't have much confidence with this part of Solidus, something like this:

      manifest.map do |m|
        adjusted_cost = m.line_item.price + m.line_item.adjustment_total / m.line_item.quantity
        adjusted_cost * m.quantity
      end.sum

`manifest` method returns Spree::ShippingManifest#items, this commit is
going to rename it to `shipping_manifest_items`.

I also refactored it to use the memoize shipping_manifest method.
`manifest` method returns Spree::ShippingManifest#items, this commit is
going to rename it to `shipping_manifest_items`.

I also refactored it to use the memoize shipping_manifest method.
This commit is going to rename the method `manifest_for_order` to
`shipping_manifest_for_order`
I also refactored it to use the memoized `shipping_manifest` method.
This commit is going to add `item_cost` calculation, all these item costs will be summed.
@kennyadsl
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@DanielePalombo what about submitting this PR on Solidus main repo?

@DanielePalombo
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I would like to submit it, But there are some failing tests. I'll work on it next Friday!

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4 participants