Added possibility to use label, error and hint helpers. TODO: verify label method name.

lib/simple_form/form_builder.rb

@@ -3,10 +3,8 @@ module SimpleForm
     attr_reader :template, :object_name, :object, :attribute, :column,
                 :input_type, :options
 
-    def input(attribute, options={})
-      @attribute, @options = attribute, options
-      @column = find_attribute_column
-      @input_type = default_input_type
+    def input(*args)
+      define_simple_form_attributes(*args)
 
       component = SimpleForm.terminator
       SimpleForm.components.reverse.each do |klass|
@@ -17,8 +15,38 @@ module SimpleForm
       component.call
     end
 
+    def error(*args)
+      define_simple_form_attributes(*args)
+      SimpleForm::Components::Error.new(self, SimpleForm.terminator).call
+    end
+
+    def hint(*args)
+      define_simple_form_attributes(*args)
+      SimpleForm::Components::Hint.new(self, SimpleForm.terminator).call
+    end
+
+    # TODO: as we are overriding default label method, we need a way to call the
+    # default label from rails, or use content tags inside our own helpers.
+    # Check whether we should remove label call, change method name or use content_tag
+    def label(*args)
+      # use default label if we pass the string as usually
+      return super if args.second.is_a?(String)
+
+      define_simple_form_attributes(*args)
+      SimpleForm::Components::Label.new(self, SimpleForm.terminator).call
+    end
+
   private
 
+    def define_simple_form_attributes(*args)
+      options = args.extract_options!
+      attribute = args.shift
+
+      @attribute, @options = attribute, options
+      @column = find_attribute_column
+      @input_type = default_input_type
+    end
+
     def default_input_type
       return @options[:as].to_sym if @options[:as]
       return :select              if @options[:collection]

test/form_builder_test.rb

@@ -186,4 +186,48 @@ class FormBuilderTest < ActionView::TestCase
     assert_select 'form input.decimal#project_budget'
   end
 
+  # ERRORS
+  test 'builder should generate an error component tag for the attribute' do
+    simple_form_for @user do |f|
+      concat f.error :name
+    end
+    assert_select 'span.error', "can't be blank"
+  end
+
+  test 'builder should allow passing options to error tag' do
+    simple_form_for @user do |f|
+      concat f.error :name, :error_html => { :id => 'name_error' }
+    end
+    assert_select 'span.error#name_error', "can't be blank"
+  end
+
+  # HINTS
+  test 'builder should generate a hint component tag for the attribute' do
+    simple_form_for @user do |f|
+      concat f.hint :name, :hint => 'Hello World!'
+    end
+    assert_select 'span.hint', 'Hello World!'
+  end
+
+  test 'builder should allow passing options to hint tag' do
+    simple_form_for @user do |f|
+      concat f.hint :name, :hint => 'Hello World!', :hint_html => { :id => 'name_hint' }
+    end
+    assert_select 'span.hint#name_hint', 'Hello World!'
+  end
+
+  # LABELS
+  test 'builder should generate a label component tag for the attribute' do
+    simple_form_for @user do |f|
+      concat f.label :name
+    end
+    assert_select 'label.string[for=user_name]', /Name/
+  end
+
+  test 'builder should allow passing options to label tag' do
+    simple_form_for @user do |f|
+      concat f.label :name, :label => 'My label', :label_html => { :id => 'name_label' }
+    end
+    assert_select 'label.string.required#name_label', /My label/
+  end
 end