random.rb

# link if
<%= link_to_if obj.method?, obj.show_blabla, url %>

# WRONG
class CleanSql
  def initialize
    @clent = Mysql2::Client.new
  end
end
# > 10_000_000.times { CleanSql.new }
# > mysql too many connection

# GOOD
class CleanSql
  CLIENT = Mysql2::Client.new
end
# > 10_000_000.times { CleanSql.new }
# > butter, money of butter and creamer butt