How to suppress Rails console/irb outputs

Question

I\'m stuck with a pretty weird problem.

I was testing some db entries in our production server in Rails Console where almost all the commands were resulting a huge n

Answer 1

Supress Output, In General

Also, depending on your needs, have a look at using quietly or silence_stream for suppressing output in general, not just in the irb/console:

silence_stream(STDOUT) do
  users = User.all
end

NOTE: silence_stream removed in Rails 5+.

NOTE: quietly will be deprecated in Ruby 2.2.0 and will eventually be removed. (Thanks BenMorganIO!)

More information can be found here.

Work Around for Rails 5+.

As mentioned above, silence_stream is no longer available because it is not thread safe. There is no thread safe alternative. But if you still want to use silence_stream and are aware that it is not thread safe and are not using it in a multithreaded manner, you can manually add it back as an initializer.

config/initializer/silence_stream.rb

# Re-implementation of `silence_stream` that was removed in Rails 5 due to it not being threadsafe.
# This is not threadsafe either so only use it in single threaded operations.
# See https://api.rubyonrails.org/v4.2.5/classes/Kernel.html#method-i-silence_stream.
#
def silence_stream( stream )
  old_stream = stream.dup
  stream.reopen( File::NULL )
  stream.sync = true
  yield

ensure
  stream.reopen( old_stream )
  old_stream.close
end