There's no stack trace in the log or anything, but I'm pretty sure this warning is coming from lib/no_brainer/railtie.rb (when using NoBrainer with Rails 5.0 RC):
DEPRECATION WARNING: to_prepare is deprecated and will be removed from Rails 5.1 (use ActiveSupport::Reloader.to_prepare instead)
There's no stack trace in the log or anything, but I'm pretty sure this warning is coming from lib/no_brainer/railtie.rb (when using NoBrainer with Rails 5.0 RC):
DEPRECATION WARNING: to_prepare is deprecated and will be removed from Rails 5.1 (use ActiveSupport::Reloader.to_prepare instead)