Tidy up the input_only method and tests

lib/simple_form/form_builder.rb

@@ -90,7 +90,7 @@ module SimpleForm
       end
     end
     alias :attribute :input
-    
+
     # Helper for outputting only the input tag, no wrapper, errors, label etc
     #
     # == Examples
@@ -101,10 +101,7 @@ module SimpleForm
     #
     def input_only(attribute_name, options={})
       options.merge!({:components => [:input], :wrapper => false})
-      column     = find_attribute_column(attribute_name)
-      input_type = default_input_type(attribute_name, column, options)
-      klass      = self.class.mappings[input_type] || self.class.const_get("#{input_type.to_s.camelize}Input")
-      klass.new(self, attribute_name, column, input_type, options).render
+      input(attribute_name, options)
     end
 
     # Helper for dealing with association selects/radios, generating the

test/form_builder_test.rb

@@ -383,9 +383,9 @@ class FormBuilderTest < ActionView::TestCase
       f.input_only :name
     end
     assert_select 'form > input.required.string'
-    assert_select 'div.string', false
-    assert_select 'label', false
-    assert_select '.hint', false
+    assert_no_select 'div.string'
+    assert_no_select 'label'
+    assert_no_select '.hint'
   end
 
   # WITHOUT OBJECT