Check boxes now return an array, but it still generate hidden fields.…

… The hidden fields are required to use Rails internal logic to mark the checkbox as checked or not which is better then reproducing the logic on our own. By default hidden fields return blank, which is automatically ignored by association_ids.

lib/formtastic.rb

@@ -796,17 +796,16 @@ def check_boxes_input(method, options)
       collection = find_collection_for_column(method, options)
       html_options = options.delete(:input_html) || {}
 
-      input_name = generate_association_input_name(method)
-
+      input_name      = generate_association_input_name(method)
       value_as_class  = options.delete(:value_as_class)
       unchecked_value = options.delete(:unchecked_value) || ''
-
+      html_options    = { :name => "#{@object_name}[#{input_name}][]" }.merge(html_options)
+
       list_item_content = collection.map do |c|
         label = c.is_a?(Array) ? c.first : c
         value = c.is_a?(Array) ? c.last : c
 
-        html_options.merge!(:name => "#{@object_name}[#{input_name}][#{value.to_s.downcase}]",
-                            :id => generate_html_id(input_name, value.to_s.downcase))
+        html_options.merge!(:id => generate_html_id(input_name, value.to_s.downcase))
 
         li_content = template.content_tag(:label,
           "#{self.check_box(input_name, html_options, value, unchecked_value)} #{label}",

spec/formtastic_spec.rb

@@ -1557,7 +1557,7 @@ def custom(arg1, arg2, options = {})
             it 'should have a checkbox input for each post' do
               Post.find(:all).each do |post|
                 output_buffer.should have_tag("form li fieldset ol li label input#author_post_ids_#{post.id}")
-                output_buffer.should have_tag("form li fieldset ol li label input[@name='author[post_ids][#{post.id}]']", :count => 2)
+                output_buffer.should have_tag("form li fieldset ol li label input[@name='author[post_ids][]']", :count => 2)
               end
             end
 
@@ -1595,7 +1595,7 @@ def custom(arg1, arg2, options = {})
                 output_buffer.should have_tag("form li fieldset ol li label input#project_author_id_#{author.id}")
                 output_buffer.should have_tag("form li fieldset ol li label input[@type='checkbox']")
                 output_buffer.should have_tag("form li fieldset ol li label input[@value='#{author.id}']")
-                output_buffer.should have_tag("form li fieldset ol li label input[@name='project[author_id][#{author.id}]']")
+                output_buffer.should have_tag("form li fieldset ol li label input[@name='project[author_id][]']")
               end
             end
           end