Using logger in Rails 4
LoggingRuby on-Rails-4Logging Problem Overview
I'm working on a Rails 4 project, and I can't seem to make anything show up in my development log when I call Rails.logger.debug "test" I've tried searching online but I feel like I haven't made much progress. How would I go about setting up a logger and telling it to write in my development log file?
Any help would be greatly appreciated.
Logging Solutions
Solution 1 - Logging
I think you should use it like this in your method. Checkout section 2.3 here
def your_method
logger.debug "This is from debug"
logger.info "This is from info"
end
Solution 2 - Logging
rails has an easy logging mechanism
from inside controller/model
logger.info 'some info'
logger.error 'some error'
etc.
From Outside these Rails's sections, in Plain Old Ruby objects such as service objects, library objects, you can easily access the same default logger
for rails < 3
logger = RAILS_DEFAULT_LOGGER
logger.info 'some info'
logger.error 'some error'
for rails > 3
logger = Rails.logger
logger.info 'some info'
logger.error 'some error'
Solution 3 - Logging
If you want to use Rails.logger in a Plain Old Ruby Object or ServiceObject, then you will need to include it manually:
class MyService
def initialize(foo)
@logger = Logger.new(STDOUT)
@foo = foo
end
def call
do_something
end
private
def do_something
@logger.debug { "do_something called! With #{@foo.class} class" }
end
end
Result:
MyService.new(Bar.new).call
# [2018-01-27T00:17:22.167974 #57866] DEBUG -- : do_something called! With Bar class
Solution 4 - Logging
If no logger output appears in your log file, then check to what value log_level has been set in your environments file (config/environments/development.rb, ...) It should either not bee there (default is :debug) or
config.log_level = :debug
should be set. Other values are:
:debug, :info, :warn, :error, :fatal, :unknown
More information here: https://guides.rubyonrails.org/debugging_rails_applications.html section 2.2 Log levels