Heroku logging not working

Question

I've got a rails 3.1 app deployed on Heroku Cedar. I'm having a problem with the logging. The default rails logs are working just fine, but when I do something like:

logger.info "log this message"

In my controller, Heroku doesn't log anything. When I deploy my app I see the heroku message "Injecting rails_log_stdout" so I think calling the logger should work just fine. Puts statements end up in my logs. I've also tried other log levels like logger.error. Nothing works. Has anyone else seen this?

Answer 1

MBHNYC's answer works great, but it makes it difficult to change the log level in different environments without changing the code. You can use this code in your environments/production.rb to honor an environment variable as well as have a reasonable default:

# https://github.com/ryanb/cancan/issues/511
config.logger = Logger.new(STDOUT)
config.logger.level = Logger.const_get((ENV["LOG_LEVEL"] || "INFO").upcase)

Use this command to set a different log level:

heroku config:set LOG_LEVEL=error

Answer 2

I was just having the same issue, solved by using the technique here:

https://github.com/ryanb/cancan/issues/511

Basically, you need to specify the logger outputs to STDOUT, some gems interfere with the logger and seem to hijack the functionality (cancan in my case).

For the click lazy, just put this in environments/production.rb

config.logger = Logger.new(STDOUT) 
config.log_level = :info