on stop set first item position at 1, not 0

.gitignore

@@ -8,3 +8,4 @@ spec/dummy/tmp/
 .idea
 coverage/
 Gemfile.lock
+.sass-cache/

Gemfile

@@ -12,6 +12,7 @@ group :development, :test do
   gem "simplecov", :require => false
 
   gem "generator_spec"
+  gem "formtastic"
 end
 
 # To use debugger (ruby-debug for Ruby 1.8.7+, ruby-debug19 for Ruby 1.9.2+)

README.markdown

@@ -16,6 +16,8 @@ This project is not related to [Apache Cocoon](http://cocoon.apache.org/)
 This gem uses jQuery, it is most useful to use this gem in a rails3
 project where you are already using jQuery.
 
+Sortable form support requires jQuery UI.
+
 Furthermore i would advice you to use either formtastic or simple_form.
 
 I have a sample project where I demonstrate the use of cocoon with formtastic.
@@ -37,6 +39,13 @@ asset_pipeline
 //= require cocoon
 ````
 
+If you also want to be able to sort nested forms, ordering them on a particular field, add `cocoon/ordered`:
+
+``` ruby
+//= require cocoon
+//= require cocoon/ordered
+```
+
 ### Rails 3.0.x
 
 If you are using Rails 3.0.x, you need to run the installation task (since rails 3.1 this is no longer needed):
@@ -125,6 +134,53 @@ That is all there is to it!
 
 There is an example project on github implementing it called [cocoon_formtastic_demo](https://github.com/nathanvda/cocoon_formtastic_demo).
 
+Or, you can use the Formtastic `cocoon` field type to wrap up much of the boilerplate of the wrapper and
+add association button:
+
+``` haml
+= f.inputs do
+  = f.input :name
+  = f.input :description
+  %h3 Tasks
+  #tasks
+    = f.input :tasks, :as => :cocoon
+  = f.actions do
+    = f.action :submit
+```
+
+#### Sortable forms
+
+Say you have a set of nested models that are ordered arbitrarily:
+
+``` ruby
+class Task < ActiveRecord::Base
+  belongs_to :project
+
+  default_scope :order => 'order ASC'
+end
+```
+
+You want users to be able to sort those
+models via the UI. You can do this by including `cocoon/ordered` and specifying the sort field in the Formtastic
+input call:
+
+``` haml
+= f.input :tasks, :as => :cocoon, :ordered_by => :order
+```
+
+Add the order field as a hidden field in the nested form:
+
+``` haml
+.nested-fields
+  = f.inputs do
+    = f.input :description
+    = f.input :done, :as => :boolean
+    = f.input :order, :as => :hidden
+    = link_to_remove_association "remove task", f
+```
+
+The order field will now be filled in correctly when new models are added and when the models are sorted.
+
 ### Using simple_form
 
 Inside our `projects/_form` partial we then write:

app/assets/javascripts/cocoon.js

@@ -7,6 +7,9 @@
     content.replace(reg_exp, with_str);
   }
 
+  $.fn.parentSiblings = function(selector) {
+    return $(this).parent().siblings(selector);
+  }
 
   $('.add_fields').live('click', function(e) {
     e.preventDefault();
@@ -67,7 +70,8 @@
 
     var timeout = trigger_node.data('remove-timeout') || 0;
 
-    setTimeout(function() {
+    setTimeout(
+      function() {
       if ($this.hasClass('dynamic')) {
           $this.closest(".nested-fields").remove();
       } else {

app/assets/javascripts/cocoon/ordered.js

@@ -0,0 +1,88 @@
+//= require jquery-ui
+//
+(function($) {
+  $.cocoon = {
+    ordered: {
+      options: {
+        items: '> .nested-fields',
+        stop: function(e, ui) {
+          if (window.CKEDITOR) {
+            var editors = $(ui.item).data('cocoon_ckeditors');
+            var i, j;
+
+            for (i = 0, j = editors.length; i < j; ++i) {
+              var id = editors[i];
+              var editor = CKEDITOR.instances[id];
+
+              if (editor) {
+                editor.destroy(true);
+                CKEDITOR.remove(id);
+              }
+
+              CKEDITOR.replace(id);
+            }
+
+            $(ui.item).data('cocoon_ckeditors', []);
+          }
+
+          $.cocoon.ordered._updateFields(this)
+        },
+        start: function(e, ui) {
+          if (window.CKEDITOR) {
+            var editors = [];
+
+            $(ui.item).find('textarea').each(function(index, element) {
+              var id = $(element).attr('id');
+              var editor = CKEDITOR.instances[id];
+              if (editor) {
+                editors.push(id);
+
+                editor.destroy();
+                CKEDITOR.remove(id);
+              }
+            });
+
+            $(ui.item).data('cocoon_ckeditors', editors);
+          }
+        }
+      },
+      _updateFields: function(element) {
+        console.log(element)
+        console.log($(element).data('fieldSearch'))
+        console.log($(element).find($(element).data('fieldSearch')))
+
+        $(element).find($(element).data('fieldSearch')).each(function(index, element) {
+          $(element).val(index + 1);
+        });
+      },
+      setup: function() {
+        $('li[data-ordered_by]').each(function(index, element) {
+          var field = $(element).data('ordered_by');
+          var fieldSelector = "[name*='[" + field + "]']"
+          var fieldGroupSelector = "> .forms > .nested-fields"
+          var orderFieldSelector = "> .nested-fields " + fieldSelector;
+          var fieldSearch = "> .forms " + orderFieldSelector;
+
+          $(element).find('.forms').data('fieldSearch', orderFieldSelector).sortable($.cocoon.ordered.options);
+
+          $(element).unbind('cocoon:after-insert').bind('cocoon:after-insert', function(e, node) {
+            var nextOrder = 0;
+
+            if ($(element).find(fieldGroupSelector).is(node)) {
+              $(element).find(fieldSearch).each(function() {
+                nextOrder = Math.max(nextOrder, Number($(this).val()));
+              });
+
+              $(node).find(fieldSelector).val(nextOrder + 1)
+            }
+          });
+        });
+
+        $(document).on('cocoon:after-insert', function() { $.cocoon.ordered.setup(); });
+      }
+    },
+  };
+
+  $(function() { $.cocoon.ordered.setup(); });
+})(jQuery);
+

app/assets/stylesheets/cocoon/active_admin.css.scss

@@ -0,0 +1,29 @@
+li.cocoon {
+  & > label {
+    display: block !important;
+    width: 100% !important;
+    float: none !important;
+  }
+
+  ol {
+    padding: 0 !important;
+    width: auto !important;
+    float: none !important;
+  }
+
+  fieldset {
+    padding: 1em !important;
+  }
+
+  .links a {
+    @extend .button;
+  }
+
+  .forms.ui-sortable {
+    fieldset {
+      border-top: solid #777 12px;
+      cursor: move;
+    }
+  }
+}
+

lib/cocoon.rb

@@ -10,6 +10,10 @@ module Cocoon
     # configure our plugin on boot
     initializer "cocoon.initialize" do |app|
       ActionView::Base.send :include, Cocoon::ViewHelpers
+
+      if Object.const_defined?("Formtastic") and Formtastic.const_defined?("Inputs")
+        require 'cocoon/formtastic/cocoon_input'
+      end
     end
 
   end

lib/cocoon/formtastic/cocoon_input.rb

@@ -0,0 +1,52 @@
+require 'formtastic'
+
+class CocoonInput
+  include ::Formtastic::Inputs::Base
+
+  def to_html
+    output = label_html << wrapped_semantic_fields << links
+
+    template.content_tag(:li, output.html_safe, wrapper_html_options)
+  end
+
+  def wrapper_html_options
+    data = super.merge(:class => 'input cocoon')
+    if options[:ordered_by]
+      data['data-ordered_by'] = options[:ordered_by]
+    end
+
+    data
+  end
+
+  def semantic_fields_for
+    builder.semantic_fields_for(method) do |fields|
+      if fields.object
+        template.render :partial => "#{singular_method}_fields", :locals => { :f => fields }
+      end
+    end
+  end
+
+  def wrapped_semantic_fields
+    template.content_tag(:div, semantic_fields_for, :class => 'forms')
+  end
+
+  def links
+    template.content_tag(:div, :class => 'links') do
+      template.link_to_add_association template.t(".add_#{singular_method}"), builder, method, input_html_options
+    end
+  end
+
+  def input_html_options
+    super.merge(
+      'data-association-insertion-node' => '.forms',
+      'data-association-insertion-traversal' => 'parentSiblings',
+      'data-association-insertion-method' => 'append'
+    )
+  end
+
+  private
+  def singular_method
+    @singular_method ||= method.to_s.singularize
+  end
+end
+

lib/cocoon/view_helpers.rb

@@ -35,6 +35,7 @@ module Cocoon
       partial = get_partial_path(custom_partial, association)
       locals =  render_options.delete(:locals) || {}
       method_name = f.respond_to?(:semantic_fields_for) ? :semantic_fields_for : (f.respond_to?(:simple_fields_for) ? :simple_fields_for : :fields_for)
+
       f.send(method_name, association, new_object, {:child_index => "new_#{association}"}.merge(render_options)) do |builder|
         partial_options = {:f => builder, :dynamic => true}.merge(locals)
         render(partial, partial_options)
@@ -99,6 +100,14 @@ module Cocoon
       partial ? partial : association.to_s.singularize + "_fields"
     end
 
+    def cocoon_wrapper(form_builder, &block)
+      content_tag(:div, :class => 'nested-fields') do
+        content_tag(:fieldset) do
+          capture(&block) << link_to_remove_association(t('.remove'), form_builder)
+        end
+      end
+    end
+
     private
 
     def create_object_on_non_association(f, association)

spec/formtastic/cocoon_input_spec.rb

@@ -0,0 +1,73 @@
+require 'spec_helper'
+require 'cocoon/formtastic/cocoon_input'
+
+describe CocoonInput do
+  let(:input) { CocoonInput.new(builder, template, object, object_name, method, options) }
+  let(:builder) { stub(:auto_index => false, :options => {}, :custom_namespace => nil, :all_fields_required_by_default => false) }
+  let(:template) { stub }
+  let(:object) { stub }
+  let(:object_name) { :object }
+  let(:method) { :nested }
+  let(:options) { {} }
+
+  describe '#wrapper_html_options' do
+    subject { input.wrapper_html_options }
+
+    context 'not ordered' do
+      it 'should not be ordered' do
+        subject.should_not have_key('data-ordered_by')
+      end
+    end
+
+    context 'ordered' do
+      let(:field) { :field }
+      let(:options) { { :ordered_by => field } }
+
+      it 'should be ordered' do
+        subject['data-ordered_by'].should == field
+      end
+    end
+  end
+
+  describe '#links' do
+    subject { input.links }
+
+    before do
+      template.stub(:content_tag).and_yield
+      template.stub(:link_to_add_association)
+      template.stub(:t)
+    end
+
+    it 'should generate the links holder' do
+      subject
+    end
+  end
+
+  describe '#semantic_fields_for' do
+    subject { input.semantic_fields_for }
+
+    before do
+      builder.stub(:semantic_fields_for)
+      template.stub(:render)
+    end
+
+    it 'should pass through to semantic_fields_for on the builder' do
+      subject
+    end
+  end
+
+  describe '#to_html' do
+    subject { input.to_html }
+
+    before do
+      input.stub(:label_html).and_return('label')
+      input.stub(:wrapped_semantic_fields).and_return('fields')
+      input.stub(:links).and_return('links')
+      template.stub(:content_tag)
+    end
+
+    it 'should concatenate the outputs and pass through to content_tag' do
+      subject
+    end
+  end
+end