Rely on Settings and don't access internal struct.

app/models/product_import/reset_absent.rb

@@ -7,25 +7,29 @@ module ProductImport
     def initialize(decorated)
       super
       @products_reset_count = 0
+
+      settings = ProductImport::Settings.new(import_settings)
+      @settings = settings.settings
+      @updated_ids = settings.updated_ids
+      @enterprises_to_reset = settings.enterprises_to_reset
     end
 
     def call
       # For selected enterprises; set stock to zero for all products/inventory
       # that were not listed in the newly uploaded spreadsheet
       return unless data_for_stock_reset?
+
       suppliers_to_reset_products = []
       suppliers_to_reset_inventories = []
 
-      settings = import_settings[:settings]
-
-      import_settings[:enterprises_to_reset].each do |enterprise_id|
-        if settings['reset_all_absent'] &&
+      enterprises_to_reset.each do |enterprise_id|
+        if reset_all_absent? &&
            permission_by_id?(enterprise_id) &&
            !importing_into_inventory?
           suppliers_to_reset_products.push(Integer(enterprise_id))
         end
 
-        if settings['reset_all_absent'] &&
+        if reset_all_absent? &&
            permission_by_id?(enterprise_id) &&
            importing_into_inventory?
           suppliers_to_reset_inventories.push(Integer(enterprise_id))
@@ -38,7 +42,7 @@ module ProductImport
             'variant_overrides.hub_id IN (?) ' \
             'AND variant_overrides.id NOT IN (?)',
             suppliers_to_reset_inventories,
-            import_settings[:updated_ids]
+            updated_ids
           )
         @products_reset_count += relation.update_all(count_on_hand: 0)
       end
@@ -53,17 +57,21 @@ module ProductImport
           'AND spree_variants.is_master = false ' \
           'AND spree_variants.deleted_at IS NULL',
           suppliers_to_reset_products,
-          import_settings[:updated_ids]
+          updated_ids
         )
       @products_reset_count += relation.update_all(count_on_hand: 0)
     end
 
     private
 
+    attr_reader :settings, :updated_ids, :enterprises_to_reset
+
     def data_for_stock_reset?
-      import_settings[:settings] &&
-        import_settings[:updated_ids] &&
-        import_settings[:enterprises_to_reset]
+      settings && updated_ids && enterprises_to_reset
+    end
+
+    def reset_all_absent?
+      settings['reset_all_absent']
     end
   end
 end

app/models/product_import/settings.rb

@@ -6,8 +6,20 @@ module ProductImport
 
     def defaults(entry)
       @import_settings.key?(:settings) &&
-        @import_settings[:settings][entry.supplier_id.to_s] &&
-        @import_settings[:settings][entry.supplier_id.to_s]['defaults']
+        settings[entry.supplier_id.to_s] &&
+        settings[entry.supplier_id.to_s]['defaults']
+    end
+
+    def settings
+      @import_settings[:settings]
+    end
+
+    def updated_ids
+      @import_settings[:updated_ids]
+    end
+
+    def enterprises_to_reset
+      @import_settings[:enterprises_to_reset]
     end
   end
 end

spec/models/product_import/settings_spec.rb

@@ -48,4 +48,58 @@ describe ProductImport::Settings do
       end
     end
   end
+
+  describe '#settings' do
+    context 'when settings are specified' do
+      let(:import_settings) { { settings: { foo: 'bar' } } }
+
+      it 'returns them' do
+        expect(settings.settings).to eq(foo: 'bar')
+      end
+    end
+
+    context 'when settings are not specified' do
+      let(:import_settings) { {} }
+
+      it 'returns nil' do
+        expect(settings.settings).to be_nil
+      end
+    end
+  end
+
+  describe '#updated_ids' do
+    context 'when updated_ids are specified' do
+      let(:import_settings) { { updated_ids: [2] } }
+
+      it 'returns them' do
+        expect(settings.updated_ids).to eq([2])
+      end
+    end
+
+    context 'when updated_ids are not specified' do
+      let(:import_settings) { {} }
+
+      it 'returns nil' do
+        expect(settings.updated_ids).to be_nil
+      end
+    end
+  end
+
+  describe '#enterprises_to_reset' do
+    context 'when enterprises_to_reset are specified' do
+      let(:import_settings) { { enterprises_to_reset: [2] } }
+
+      it 'returns them' do
+        expect(settings.enterprises_to_reset).to eq([2])
+      end
+    end
+
+    context 'when enterprises_to_reset are not specified' do
+      let(:import_settings) { {} }
+
+      it 'returns nil' do
+        expect(settings.enterprises_to_reset).to be_nil
+      end
+    end
+  end
 end