Boolean hidden field uses name when :nested

Closes #619

lib/simple_form/inputs/boolean_input.rb

@@ -50,7 +50,8 @@ module SimpleForm
       # generates invalid html - html5 only).
       def build_hidden_field_for_checkbox
         @builder.hidden_field(attribute_name, :value => '0', :id => nil,
-                              :disabled => input_html_options[:disabled])
+                              :disabled => input_html_options[:disabled],
+                              :name => input_html_options[:name])
       end
 
       def inline_label

test/inputs/boolean_input_test.rb

@@ -84,6 +84,13 @@ class BooleanInputTest < ActionView::TestCase
     end
   end
 
+  test 'input with nested style allows customizing input_html' do
+    swap SimpleForm, :boolean_style => :nested do
+      with_input_for @user, :active, :boolean, :input_html => { :name => 'active_user' }
+      assert_select "input[type=hidden][name=active_user] + label.boolean > input.boolean[name=active_user]"
+    end
+  end
+
   test 'input boolean works using :input only in wrapper config (no label_input)' do
     swap_wrapper do
       with_input_for @user, :active, :boolean