Satisfy rubocop

db/migrate/20170131221752_add_relative_position_to_issues.rb

@@ -26,6 +26,6 @@ class AddRelativePositionToIssues < ActiveRecord::Migration
   def change
     add_column :issues, :relative_position, :integer
 
-    add_index :issues, :relative_position
+    add_concurrent_index :issues, :relative_position
   end
 end

spec/services/issues/update_service_spec.rb

@@ -67,7 +67,7 @@ describe Issues::UpdateService, services: true do
           issue.save
         end
 
-        opts.merge! move_between_iids: [issue1.iid, issue2.iid]
+        opts[:move_between_iids] = [issue1.iid, issue2.iid]
 
         update_issue(opts)