Ruby on Rails
HowtoAccessTheLogFile (Version #5)

Rails makes use of ruby’s standard logger For background about what the logger is and how to use it in Rails, see logger.

From within a controller:


  logger.debug "user.id = #{user.id}"
  logger.info "Starting process fubar..."
  logger.warn "No results found for XYZ"
  logger.error err.message
  logger.fatal "Database down"

From within a view:

@logger.debug "user.id = #{user.id}" </pre>

(This will hopefully be rationalised in a future version of Rails.)

Finally, there’s a constant RAILS_DEFAULT_LOGGER which can be used from anywhere, including the console.

I’m using RoR 1.0 and ‘logger’ works for me in View.
In summary:



                             Model     View     Controller    Console

    @logger                    –        X           –            -

    logger                     X        –           X            -

    RAILS_DEFAULT_LOGGER       X        X           X            X

A better summary would be



                             Model     View     Controller    Console

    logger                     X        X           X            X

but that’s not the way it works at the moment (2005-04-21).

To expose the controller’s logger to its views, including helper methods:

  class ApplicationController < ActionController::Base
    helper_method :logger
  end

See also HowtoConfigureLogging.

category: Howto

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