Match path fix for tabs in Solidus < 2.8

config/initializers/solidus.rb

@@ -0,0 +1,29 @@
+# In versions of Solidus prior to 2.8, we override this class to
+# add the match_path option to the initializer. (Version 2.8 has
+# this option already.) This option is used in the tabs partial
+# to configure the paths for which a given tab is active.
+#
+if Spree.solidus_gem_version < Gem::Version.new('2.8')
+  Spree::BackendConfiguration::MenuItem.class_eval do
+    attr_reader :match_path
+
+    def initialize(
+      sections,
+      icon,
+      condition: nil,
+      label: nil,
+      partial: nil,
+      url: nil,
+      match_path: nil
+    )
+
+      @condition = condition || -> { true }
+      @sections = sections
+      @icon = icon
+      @label = label || sections.first
+      @partial = partial
+      @url = url
+      @match_path = match_path
+    end
+  end
+end

lib/alchemy/solidus/engine.rb

@@ -44,6 +44,15 @@ class Engine < ::Rails::Engine
           end
         end
       end
+
+      # In versions of Solidus prior to 2.8, we override the tabs partial
+      # to pass a match_path value to each tab. (Version 2.8 is already
+      # passing this option.) This option is used to configure the paths
+      # for which a given tab is active.
+      #
+      if Spree.solidus_gem_version < Gem::Version.new('2.8')
+        paths['app/views'] << 'lib/match_path'
+      end
     end
   end
 end

lib/generators/alchemy/solidus/install/install_generator.rb

@@ -67,7 +67,8 @@ def inject_admin_tab
             \    label: :cms,
             \    condition: -> { can?(:index, :alchemy_admin_dashboard) },
             \    partial: 'spree/admin/shared/alchemy_sub_menu',
-            \    url: '/admin/pages'
+            \    url: '/admin/pages',
+            \    match_path: '/pages'
             \  )
           ADMIN_TAB
         end

lib/match_path/spree/admin/shared/_tabs.html.erb

@@ -0,0 +1,15 @@
+<% Spree::Backend::Config.menu_items.each do |menu_item| %>
+  <% if instance_exec(&menu_item.condition) %>
+    <%=
+      tab(
+          *menu_item.sections,
+          icon: menu_item.icon,
+          label: menu_item.label,
+          url: menu_item.url.is_a?(Symbol) ? spree.public_send(menu_item.url) : menu_item.url,
+          match_path: menu_item.match_path
+      ) do
+    %>
+      <%- render partial: menu_item.partial if menu_item.partial %>
+    <%- end %>
+  <% end %>
+<% end %>