From 23b5e73c97c0372c8071dcc20f28d12084d3f49e Mon Sep 17 00:00:00 2001
From: Jean-Baptiste Bellet <jb.bellet@gmail.com>
Date: Mon, 24 Oct 2022 16:47:27 +0200
Subject: [PATCH] Weight is computed with `unit_value` and product
 `variant_unit_scale`

---
 app/models/spree/line_item.rb | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/app/models/spree/line_item.rb b/app/models/spree/line_item.rb
index 512f381f36..3f7f8e73e4 100644
--- a/app/models/spree/line_item.rb
+++ b/app/models/spree/line_item.rb
@@ -126,7 +126,7 @@ module Spree
     def copy_dimensions
       return unless variant
 
-      self.weight ||= variant.weight
+      self.weight ||= computed_weight_from_variant
       self.height ||= variant.height
       self.width ||= variant.width
       self.depth ||= variant.depth
@@ -236,6 +236,14 @@ module Spree
 
     private
 
+    def computed_weight_from_variant
+      if variant.product.variant_unit == "weight"
+        variant.unit_value / variant.product.variant_unit_scale
+      else
+        variant.weight
+      end
+    end
+
     def update_inventory
       return unless changed?