AJAX_ify StockArticle manipulation; Introduce publish/subscribe pattern for DOM updates

app/controllers/stockit_controller.rb

@@ -4,30 +4,62 @@ class StockitController < ApplicationController
     @stock_articles = StockArticle.undeleted.includes(:supplier, :article_category).
         order('suppliers.name, article_categories.name, articles.name')
   end
+  
+  def index_on_stock_article_create # See publish/subscribe design pattern in /doc.
+    @stock_article = StockArticle.find(params[:id])
+    
+    render :layout => false
+  end
 
+  def index_on_stock_article_update # See publish/subscribe design pattern in /doc.
+    @stock_article = StockArticle.find(params[:id])
+    
+    render :layout => false
+  end
+
+  # three possibilites to fill a new_stock_article form
+  # (1) start from blank or use params
   def new
-    @stock_article = StockArticle.new
+    @stock_article = StockArticle.new(params[:stock_article])
+
+    render :layout => false
+  end
+  
+  # (2) StockArticle as template
+  def copy
+    @stock_article = StockArticle.find(params[:stock_article_id]).dup
+    
+    render :layout => false
+  end
+  
+  # (3) non-stock Article as template
+  def derive
+    @stock_article = Article.find(params[:old_article_id]).becomes(StockArticle).dup
+    
+    render :layout => false
   end
 
   def create
     @stock_article = StockArticle.new(params[:stock_article])
-    if @stock_article.save
-      redirect_to stock_articles_path, :notice => I18n.t('stockit.stock_create.notice')
+    if @stock_article.valid? and @stock_article.save
+      render :layout => false
     else
-      render :action => 'new'
+      render :action => 'new', :layout => false
     end
   end
 
   def edit
     @stock_article = StockArticle.find(params[:id])
+    
+    render :layout => false
   end
 
   def update
     @stock_article = StockArticle.find(params[:id])
     if @stock_article.update_attributes(params[:stock_article])
-      redirect_to stock_articles_path, :notice => I18n.t('stockit.stock_update.notice')
+      render :layout => false
     else
-      render :action => 'edit'
+      render :action => 'edit', :layout => false
     end
   end
 
@@ -36,9 +68,15 @@ class StockitController < ApplicationController
     @stock_changes = @stock_article.stock_changes.order('stock_changes.created_at DESC')
   end
 
+  def show_on_stock_article_update # See publish/subscribe design pattern in /doc.
+    @stock_article = StockArticle.find(params[:id])
+    
+    render :layout => false
+  end
+
   def destroy
-    @article = StockArticle.find(params[:id])
-    @article.mark_as_deleted
+    @stock_article = StockArticle.find(params[:id])
+    @stock_article.mark_as_deleted
     render :layout => false
   rescue => error
     render :partial => "destroy_fail", :layout => false,