rename_collection_mongoid.rb

class Mongoid::Migration
  # renames a collection in mongodb, can be told to drop the target collection first
  def self.rename_collection(old_name, new_name, drop_target=false)
    client = Mongoid::Clients.default
    current_db = client.database
    admin_db = Mongo::Database.new(client, Mongo::Database::ADMIN, current_db.options)
    admin_db.command(renameCollection: "#{current_db.name}.#{old_name}",
                     to: "#{current_db.name}.#{new_name}",
                     dropTarget: drop_target)
  end
end