ArgumentError: interning empty string and enum-column plugin

[clem_c_rock]

Hello,

I am a developer who has just started working on a large scale website in a team of 5 other developers. One of the developers has introduced some enum columns into the the database. Now, by default, active record doesn't support enum column types but I have added the enum-column plugin into our project. This has worked very well except for a few instances where he introduced enums that featured and empty string IE. enum('','Artist','Venue','Fan','Label').

This causes the mysql_adapter.rb section of the plugin to throw a "ArgumentError: interning empty string" error in this section of code:

class MysqlColumnWithEnum < MysqlColumn
      include ActiveRecordEnumerations::Column
      
      def initialize(name, default, sql_type = nil, null = true)
        if sql_type =~ /^enum/i
          
          values = sql_type.sub(/^enum\('([^)]+)'\)/i, '\1').split("','").map { |v| v.intern}
          
          default = default.intern if default and !default.empty?
        end
        super(name, default, sql_type, null, values)
      end
    end
  end

Does anyone know how I can work around this error?

Thanks for your time!

Clem C

[Fenrir2]

The problem is that v is empty, so v.intern doesn't work. Maybe you can use nil if v is empty, like this:

values = sql_type.sub(/^enum\('([^)]+)'\)/i, '\1').split("','").map{|v| v.intern unless v.empty?}