Added error class as configuration option on setup

lib/generators/simple_form/templates/simple_form.rb

@@ -10,6 +10,9 @@ SimpleForm.setup do |config|
   # CSS class to add to all hint tags.
   # config.hint_class = :hint
 
+  # Default tag used on errors.
+  # config.error_class = :error
+
   # Default tag used on errors.
   # config.error_tag = :span
 

lib/simple_form.rb

@@ -23,6 +23,10 @@ module SimpleForm
   mattr_accessor :error_tag
   @@error_tag = :span
 
+  # CSS class to add to all error tags.
+  mattr_accessor :error_class
+  @@error_class = :error
+
   # Method used to tidy up errors.
   mattr_accessor :error_method
   @@error_method = :first

lib/simple_form/components/errors.rb

@@ -20,7 +20,7 @@ module SimpleForm
       end
 
       def error_html_options
-        html_options_for(:error, [:error])
+        html_options_for(:error, [SimpleForm.error_class])
       end
 
     protected