Easily debug rake task

debug.rake

desc "switch rails logger to stdout"
task :verbose => [:environment] do
  Rails.logger = Logger.new(STDOUT)
end

desc "switch rails logger log level to debug"
task :debug => [:environment, :verbose] do
  Rails.logger.level = Logger::DEBUG
end

desc "switch rails logger log level to info"
task :info => [:environment, :verbose] do
  Rails.logger.level = Logger::INFO
end

On the initialization, Rails stores a logger instance reference in Rails.logger and also in some other places, like ActiveRecord::Base.logger, ActiveJob::Base.logger, etc. It is the same object referenced in different locations.

Rails.logger == ActiveRecord::Base.logger # => true

Better than create a new logger like in line 3 of debug.rake would be change the existing object output to STDOUT. It is possible to accomplish that using the logger reopen method. Like this:

Rails.logger.reopen(STDOUT)