Mongoid3 Cleaner can not remove a collection that contains the "system" in name.

[sakomoko]

Mongoid3 Cleaner can not remove a collection that contains the "system" in name.
collection name e.g. user_systems, system_settings

Cause
Moped::Truncation.collections

      def collections
        session['system.namespaces'].find(:name => { '$not' => /system|\$/ }).to_a.map do |collection|
          _, name = collection['name'].split('.', 2)
          name
        end
      end

I think. To fix this, change the RegExp.

e.g.
/^system\./

[jfrey]

I ran into this as well.

[ekampp]

According to this article, all the system collections has something following them, and doesn't start with "system". So perhaps this is a more stable solution?

/\.system\.|\$/

Edit

Exactly like it is in the current master. I think this issue is closed?