CODEWITHSUNDEEP
rubylogging
R891
R891

Reputation: 2719

Ruby logger is nil

When I try to use Ruby's logger, it comes up as nil. Is an instance variable the correct way to do this?

require 'logger'

class LogStuff

  # Log to STDOUT and `tee` it to a file
  @logger = Logger.new("| tee output.log")
  @logger.level = :debug

  def run
    (1..10).each do |n|
      @logger.debug('l1') { @logger.debug "proceessing #{n}" }
    end

    ['a', 'b', 'c', 'd', 'e'].each do |letter|
      @logger.debug('letters') { @logger.debug "proceessing #{letter}" }
    end
  end

end

if __FILE__ == $0
  lggr = LogStuff.new
  lggr.run
end

Error message:

$ ruby script.rb 
script.rb:11:in `block in run': undefined method `debug' for nil:NilClass (NoMethodError)
        from script.rb:10:in `each'
        from script.rb:10:in `run'
        from script.rb:23:in `<main>'

Upvotes: 1

Views: 1014

Answers (1)

Ursus
Ursus

Reputation: 30056

Try this one

def initialize
  # Log to STDOUT and `tee` it to a file
  @logger = Logger.new("| tee output.log")
  @logger.level = :debug
end

Obviously into the LogStuff class. Basically, otherwise your @logger variable is defined in another scope.

Upvotes: 1

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