Use the fancy disable API.

lib/simple_form/components/errors.rb

@@ -5,6 +5,10 @@ module SimpleForm
         enabled_error
       end
 
+      def has_errors?
+        object && object.respond_to?(:errors) && errors.present?
+      end
+
     protected
 
       def enabled_error
@@ -15,10 +19,6 @@ module SimpleForm
         nil
       end
 
-      def has_errors?
-        object && object.respond_to?(:errors) && errors.present?
-      end
-
       def error_text
         if options[:error_prefix]
           options[:error_prefix] + " " + errors.send(error_method)

lib/simple_form/components/placeholders.rb

@@ -5,10 +5,14 @@ module SimpleForm
         nil # This component is disabled by default.
       end
 
+      def has_placeholder?
+        options[:placeholder] != false && placeholder_text.present?
+      end
+
       private
 
       def enabled_placeholder
-        input_html_options[:placeholder] ||= placeholder_text if placeholder_present?
+        input_html_options[:placeholder] ||= placeholder_text if has_placeholder?
         nil
       end
 
@@ -16,10 +20,6 @@ module SimpleForm
         nil
       end
 
-      def placeholder_present?
-        options[:placeholder] != false && placeholder_text.present?
-      end
-
       def placeholder_text
         @placeholder_text ||= options[:placeholder] || translate(:placeholders)
       end

lib/simple_form/inputs/hidden_input.rb

@@ -1,9 +1,7 @@
 module SimpleForm
   module Inputs
     class HiddenInput < Base
-      def label; "" end
-      def error; end
-      def hint;  end
+      disable :label, :error, :hint
 
       def input
         @builder.hidden_field(attribute_name, input_html_options)