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

Here's what I just added to config/initializers/logging.rb:

Rails.configuration.log_tags = [
  :uuid,   # request UUID
  lambda { |req|
    # Credentials are (currently) in the format of:
    #
    #   ::
    #
    # So we have to split by '::' to obtain the user_id for logging.
    #
    # This will just output "User: nil" if there is no current session.
    "User: #{req.cookies['user_credentials'].to_s.split('::')[1]}"
  }
]

This is for Authlogic. What you need to do might vary, so you should really dig in and see what your data exposes to you already.

Step 1:

See what the req object has available. Add this to config/initializers/logging.rb:

Rails.configuration.log_tags = [
  lambda { |req|
    req.inspect
  }
]

Then hit a page, and see what gets dumped.

Step 2: See if your cookie jar has enough information, using the same technique:

Rails.configuration.log_tags = [
  lambda { |req|
    req.cookies.inspect
  }
]

(hit a request)

An aside: Don't worry about putting in usernames/emails into the logs - user ID is good enough, and you can look it up in the database to get any extra metadata you need.