def truncate!
      Clients.default.database.collections.each do |collection|
        collection.find.delete_many
      end and true
    end
def truncate!
      Clients.default.database.collections.each do |collection|
        collection.find.delete_many
      end and true
    end
Truncate all data in all collections, but not the indexes.

 @example Truncate all collection data.
   Mongoid::Config.truncate!

 @note This will be slower than purge!

 @return [ true ] true.

 @since 2.0.2