Need some help with ruby split

I have a field called 'path' which contains alinux filesystem path, and I'm trying to use ruby split to get the last and 3rd fields. These will be stored in two new fields called 'log_filename' and 'deployment' like this:

 ruby {
         code => "event.set('log_filename', event.get('path').split('/').last)"
         code => "event.set('deployment', event.get('path').split('/')[2])"

Without the second line, this was working fine. With this line in, logstash won't start correctly. What did I do wrong?

Cannot create pipeline {:reason=>"Something is wrong with your configuration.", :backtrace=>["/usr/share/logstash/logstash-core/lib/logstash/config/mixin.rb:89:inconfig_init'", "/usr/share/logstash/logstash-core/lib/logstash/filters/base.rb:128:in initialize'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/logstash-filter-ruby-3.1.5/lib/logstash/filters/ruby.rb:48:ininitialize'", "/usr/share/logstash/logstash-core/lib/logstash/filter_delegator.rb:21:in initialize'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:110:inplugin'", "(eval):428:in initialize'", "org/jruby/'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:75:in initialize'", "/usr/share/logstash/logstash-core/lib/logstash/pipeline.rb:165:ininitialize'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:296:in create_pipeline'", "/usr/share/logstash/logstash-core/lib/logstash/agent.rb:95:inregister_pipeline'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:313:in execute'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:67:inrun'", "/usr/share/logstash/logstash-core/lib/logstash/runner.rb:204:in run'", "/usr/share/logstash/vendor/bundle/jruby/1.9/gems/clamp-0.6.5/lib/clamp/command.rb:132:inrun'", "/usr/share/logstash/lib/bootstrap/environment.rb:71:in (root)'"]}

Quite often specifying an option multiple times will do what you want, but sometimes it doesn't. And then it tends to be very confusing. When you specify two versions of an option, it gets converted into an array. Sometimes logstash will be comfortable turning an array into a hash, or a hash into an array, but it will not convert an array into a string. That is what this error message is telling you

  # This setting must be a string
  # Expected string, got ["event.set('log_filename', event.get('path').split('/').last)", "event.set('deployment', event.get('path').split('/')[2])"]

You could combine then into one

code => "
    event.set('log_filename', event.get('path').split('/').last)
    event.set('deployment', event.get('path').split('/')[2])

But personally I would do this using mutate

    mutate { copy => { "path" => "[@metadata][path]" } }
    mutate { split => { "[@metadata][path]" => "/" } }
    mutate {
        add_field => {
            "name" => "%{[@metadata][path][-1]}"
            "deployment" => "%{[@metadata][path][-2]}"

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