Silencing Deprecation warnings in Rails 3

Question

Can anyone tell me how to silence deprecation warinings in Rails 3?

I have a few situations where it is throwing false positives. Namely using - for loops in haml and f.error_messages from the dynamic_form plugin.

Thanks

Answer 1

To silence all deprecation warnings you can do:

ActiveSupport::Deprecation.silenced = true

This could be placed in an initializer or in the environment file for a specific environment (e.g. to silence only in production for example.)

Or for a specific section of code, enclose it in a block:

ActiveSupport::Deprecation.silence do
  # no warnings for any use of deprecated methods here
end

This works for both Rails 3 & 4.

Answer 2

The accepted answer didn't work for me with Rails 3.2.12. Placing it in either the environments/production.rb or an initializer still outputted the warnings. I had to put it in my config/environment.rb file before the application was initialized:

# Load the rails application
require File.expand_path('../application', __FILE__)

::ActiveSupport::Deprecation.silenced = true if Rails.env.production?

# Initialize the rails application
Notices::Application.initialize!

Answer 3

Ryan Daigle wrote an article about this, in which he also showed how you can intercept the deprecation warning and do something else with it, like send it to a log file:

ActiveSupport::Deprecation.behavior = Proc.new { |msg, stack| MyLogger.warn(msg) }

http://ryandaigle.com/articles/2006/12/4/how-to-turn-deprecation-warnings-off-in-rails