Admin users did not work with custom user models

If Spree.user_class was other than Spree::User, it was failing
to create edit and delete url's in Admin::UsersController#index,
using CustomUser for example, it tried to generate: admin_custom_user_url
instead of using the existing admin_user_url

backend/app/views/spree/admin/users/index.html.erb

@@ -87,10 +87,10 @@
         <td class="align-center"><%= l user.created_at.to_date %></td>
         <td data-hook="admin_users_index_row_actions" class="actions">
           <% if can?(:edit, user) %>
-            <%= link_to_edit user, no_text: true %>
+            <%= link_to_edit user, no_text: true, url: spree.admin_user_path(user) %>
           <% end %>
           <% if can?(:destroy, user) && user.orders.count.zero? %>
-            <%= link_to_delete user, no_text: true %>
+            <%= link_to_delete user, no_text: true, url: spree.admin_user_path(user) %>
           <% end %>
         </td>
       </tr>

backend/spec/controllers/spree/admin/users_controller_spec.rb

@@ -59,6 +59,33 @@
         expect(assigns(:collection)).to eq [user]
       end
     end
+
+    context "when Spree.user_class have a different namespace than Spree" do
+      class UserModel < ApplicationRecord
+        self.table_name = 'spree_users'
+        include Spree::UserMethods
+      end
+
+      around do |example|
+        Spree.user_class = 'UserModel'
+        UserModel.create(email: "a@solidus.io")
+        example.run
+        Spree.user_class = 'Spree::LegacyUser'
+      end
+
+
+      stub_authorization! do |_user|
+        can :manage, Spree.user_class
+      end
+
+      render_views
+
+      it "renders the edit and delete links correctly" do
+        get :index
+
+        expect(response).to be_successful
+      end
+    end
   end
 
   context "#show" do