From 6c5a69b53c887e4fcf0a9dd051401102e1ad37cc Mon Sep 17 00:00:00 2001
From: Gurpreet Singh <gurpreet@vinsol.com>
Date: Sun, 25 Dec 2016 14:26:38 +0530
Subject: [PATCH] ensure no inventory unit present before destroy any variant

---
 app/models/spree/variant_decorator.rb | 10 ++++++++++
 config/locales/en.yml                 |  1 +
 2 files changed, 11 insertions(+)

diff --git a/app/models/spree/variant_decorator.rb b/app/models/spree/variant_decorator.rb
index 11f5e378..c939b02d 100644
--- a/app/models/spree/variant_decorator.rb
+++ b/app/models/spree/variant_decorator.rb
@@ -5,6 +5,8 @@
   has_many :assemblies, through: :assemblies_variants, class_name: "Spree::Variant", dependent: :destroy
   has_many :parts, through: :parts_variants, class_name: "Spree::Variant", dependent: :destroy
 
+  before_destroy :ensure_no_inventory_units
+
   def assemblies_for(products)
     assemblies.where(id: products)
   end
@@ -12,4 +14,12 @@ def assemblies_for(products)
   def part?
     assemblies.exists?
   end
+
+  private
+    def ensure_no_inventory_units
+      if inventory_units.any?
+        errors.add(:base, Spree.t(:cannot_destroy_if_attached_to_inventory_units))
+        return false
+      end
+    end
 end
diff --git a/config/locales/en.yml b/config/locales/en.yml
index f5baaac5..a5af1ebb 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -3,6 +3,7 @@ en:
   spree:
     available_parts: Available parts
     can_be_part: Can be part
+    cannot_destroy_if_attached_to_inventory_units: Cannot delete variants once they are attached to inventory unit.
     individual_sale: Individual sale
     no_variants: No variants
     parts: Parts