How to log user_name in Rails?

Question

I use Devise in Rails 3. I want to see name of current_user in production.log.

I would like to configure rails like this:

config.log_tags = [:user_na         


        

Answer 1

What almost worked for me (Rails 3.2.22.2) is the answer from here: http://benjit.com/rails/logger/2016/02/26/getting-admin-user-into-rails-logfile/

This assumes that the cookie_jar object responds to encrypted. However it wasn't the case for me. What ultimately worked for me is as follows:

config/initializers/logging.rb:

Rails.configuration.log_tags = [
  lambda { |req|
    session_key = Rails.application.config.session_options[:key]
    session_data = req.cookie_jar.signed[Rails.application.config.session_options[:key] ]
    warden_data = ( session_data["warden.user.user.key"]|| [[]])
    admin_user = warden_data[0][0]
    "u: #{admin_user || 0}"
  }
]