Helpful uncategorized tips.

general.rb

# Autoload `lib` directory.
# Inside config/application.rb
config.autoload_paths << Rails.root.join('lib')

scaffold.rb

# Skip jbuilder files when generating scaffolds.
config.generators do |g|
  g.assets            false
  g.helper            false
  g.test_framework    nil
  g.jbuilder          false
end

# Or specifying one generator only.
config.generators.jbuilder = false

useful.rb

# Render to string.
@m = render_to_string :template => "template", :locals => {:sender => sender}