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Keep backorders when splitting part of variant to new shipment with same SL #5670

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Keep backorders when splitting part of variant to new shipment with same SL #5670

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@spaghetticode spaghetticode commented Feb 26, 2024 •
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Summary

Fixes #5669

When splitting a shipment to the same stock location, when not the whole quantity for the variant is moved it may happen, if there are backordered items, that these disappear (they become on hand).

This PR first reworks and adds further coverage to specs for the Spree::FulfilmentChanger service to expose the issue, then addresses it in the last commit.

fix.mov

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@github-actions github-actions bot added the changelog:solidus_core Changes to the solidus_core gem label Feb 26, 2024
@spaghetticode spaghetticode force-pushed the spaghetticode/fix-issue-5669 branch 2 times, most recently from 8781d81 to 356feb9 Compare February 26, 2024 15:25
@spaghetticode spaghetticode changed the title Maintain backordered items when splitting part of a variant to a new shipment with same SL Keep backordered items when splitting part of a variant to a new shipment with same SL Feb 26, 2024
@spaghetticode spaghetticode changed the title Keep backordered items when splitting part of a variant to a new shipment with same SL Keep backorders when splitting part of a variant to a new shipment with same SL Feb 26, 2024
@spaghetticode spaghetticode changed the title Keep backorders when splitting part of a variant to a new shipment with same SL Keep backorders when splitting part of variant to new shipment with same SL Feb 26, 2024
@kennyadsl
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Hey @spaghetticode, is this still a draft intentionally or can we start reviewing?

@spaghetticode spaghetticode marked this pull request as ready for review February 27, 2024 10:33
@spaghetticode spaghetticode requested a review from a team as a code owner February 27, 2024 10:33
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@kennyadsl it should be good for review, I'm sorry for the confusion.

kennyadsl
kennyadsl reviewed Feb 27, 2024
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Left a couple of questions, thanks Andrea!

core/app/models/spree/fulfilment_changer.rb Outdated Show resolved Hide resolved
core/app/models/spree/fulfilment_changer.rb Outdated Show resolved Hide resolved
@spaghetticode
Use let! to remove explicit calls from before block
319cb6e
@spaghetticode
Move let statements inside context block
9062828 
These are already overridden in all other first-level context blocks
so it makes sense to move them in the single block that relies on
these values.
@spaghetticode
Extract shared examples
57c62ab 
Also, a couple of useless `let!` are removed (these records already
exist).
@spaghetticode
Reuse existing shared example
2ff1bf4 
The removed spec can be replaced by the shared example, which
includes one further test so it slightly improves coverage.
@spaghetticode
Reuse existing let value
0d1e747 
This helps keeping things in sync just in the case that numbers
change.
@spaghetticode
Extract shared example for later reuse
0079208 
These specs don't really require a specific first level scenario,
so we're first extracting them to a shared example, and with the
following commit we're going to use it in other existing scenarios.
@spaghetticode
Rework and reuse inventory units shared example
67e609b 
The existing scenario is reworked in order to expose an issue
when moving a few items of a variant (not all of them) to a
shipment with same stock location as the original one.
kennyadsl
kennyadsl approved these changes Mar 7, 2024
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Left a comment on the method name but it's not blocking, 👍

core/app/models/spree/stock/quantifier.rb Outdated Show resolved Hide resolved
@spaghetticode
Refactor Quantifier initialization
0524dcd 
This is propedeutic for the following commit.
@spaghetticode spaghetticode force-pushed the spaghetticode/fix-issue-5669 branch 2 times, most recently from 64f159c to 9539dd4 Compare March 7, 2024 17:33
@spaghetticode
Add Quantifier#positive_stock method
2e17aeb 
When the quantifier is initialized with a stock location or its ID,
the new method returns the positive amount of stock on hand or zero,
if the stock for the variant is negative. Otherwise, it returns nil.
@spaghetticode
Properly calculate inventory item quantities to be moved
a1bb98e 
The backordered quantity count should differ depending on whether
moving to the same or a different stock location. For this reason,
the way we calculate `available_quantity` changes as follows:

* when the stock location differs:
  the stock on hand at the new shipment stock location;
* when the stock location is the same:
  the sum of the stock on hand at the shipment stock location
  plus the number of on_hand inventory items from the shipment

The explicit `backordered_quantity` variable is introduced to track
the number of backordered items for the target shipment. The value
is calculated as follows:

* when the stock location differs:
  the quantity to be moved minus the positive available quantity at
  the stock location;
* when the stock location is the same:
  the shipment total quantity for the variant minus the positive
  available quantity at the stock location.

Also, we start the process by moving backordered items first to
to make sure no pending backordered item remains. If the backordered
count decreased, we're going to leave a few to be later moved and
transformed to on hand, while if the backordered count increased, we
are going to move also some previously on hand items.
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@kennyadsl kennyadsl kennyadsl approved these changes

@adammathys adammathys adammathys approved these changes

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changelog:solidus_core Changes to the solidus_core gem type:bug Error, flaw or fault
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[Backend] Backordered items may become on hand when splitting shipment
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@spaghetticode @kennyadsl @adammathys