irbrc.rb

if defined?(ActiveRecord::Base)
  class ActiveRecord::Base
    def self.sample
      s = scoped
      c = s.count
      s.offset(rand(c)).first
    end
  end

  def __clear_lhm(sure = false)
    conn = ActiveRecord::Base.connection
    tables = conn.execute("SHOW TABLES").to_a.map(&:first)
    tables.grep(/^lhm/).each do |table|
      if sure
        puts "Dropping #{table}"
        conn.execute("DROP TABLE #{table}")
      else
        puts "Would drop #{table}"
      end
    end
    nil
  end
end