add available units to instance prefs page

app/controllers/spree/admin/general_settings_controller.rb

@@ -10,6 +10,13 @@ module Spree
       end
 
       def update
+        available_units = []
+        params.each do |name, value|
+          if value == "1" && unit = name.match(/available_units_(.*)/)&.captures&.first
+            available_units << unit
+          end
+        end
+        Spree::Config[:available_units] = available_units.join(",")
         params.each do |name, value|
           next unless Spree::Config.has_preference? name
 

app/models/spree/app_configuration.rb

@@ -144,5 +144,8 @@ module Spree
     # Enable cache
     preference :enable_products_cache?, :boolean,
                default: (Rails.env.production? || Rails.env.staging?)
+
+    # Available units
+    preference :available_units, :string, default: "g,kg,T,mL,L,kL"
   end
 end

app/views/spree/admin/general_settings/edit.html.haml

@@ -87,6 +87,15 @@
             .field
               = preference_field_tag(:enable_localized_number?, Spree::Config[:enable_localized_number?], type: Spree::Config.preference_type(:enable_localized_number?))
               = label_tag(:enable_localized_number?, t('admin.number_localization.enable_localized_number')) + tag(:br)
+          %fieldset.available_units.no-border-bottom
+            %legend{:align => "center"}= t('admin.available_units')
+            .field
+              - all_units = ["g", "oz", "lb", "kg", "T", "mL", "L", "kL"]
+              - selected_units = Spree::Config[:available_units].split(",")
+              - all_units.each do |unit|
+                - selected = selected_units.include?(unit)
+                = preference_field_tag("available_units_#{unit}", selected, { type: :boolean, selected: selected })
+                = label_tag(unit, unit.downcase) + tag(:br)
 
       .form-buttons.filter-actions.actions{"data-hook" => "buttons"}
         = button Spree.t('actions.update'), 'icon-refresh'

config/locales/en.yml

@@ -394,6 +394,8 @@ en:
     unsaved_confirm_leave: "There are unsaved changed on this page. Continue without saving?"
     unsaved_changes: "You have unsaved changes"
 
+    available_units: "Available Units"
+
     shopfront_settings:
       embedded_shopfront_settings: "Embedded Shopfront Settings"
       enable_embedded_shopfronts: "Enable Embedded Shopfronts"