ruby.rb

Code:
      puts "#start"
      puts type_name
      puts record.has_key?("_type")
      type_name = record[:_type] if record.has_key?("_type")
      puts type_name
      puts "#end"

Log:
#start
fluentd
true

#end

Why type_name set to nil ?

Code:
p "#start"
p type_name
p record.has_key?("_type")
type_name = record["_type"] if record.has_key?("_type")
p type_name
p "#end"

Logs:
"#start"
"fluentd"
false
nil
"#end"