only allow to add articles not already present in receive

app/helpers/finance/receive_helper.rb

@@ -1,8 +1,11 @@
 # :encoding:utf-8:
 module Finance::ReceiveHelper
   # TODO currently duplicate a bit of DeliveriesHelper.articles_for_select2
-  def articles_for_select2(supplier)
-    supplier.articles.undeleted.reorder('articles.name ASC').map do |a|
+  # except is an array of article id's to omit
+  def articles_for_select2(supplier, except = [])
+    articles = supplier.articles.reorder('articles.name ASC')
+    articles.reject! {|a| not except.index(a.id).nil? } if except
+    articles.map do |a|
       {:id => a.id, :text => "#{a.name} (#{a.unit_quantity}⨯#{a.unit})"}
     end
   end

app/views/finance/receive/_edit_articles.html.haml

@@ -1,6 +1,8 @@
 - content_for :javascript do
   :javascript
 
+    var new_article_data = #{articles_for_select2(@order, @order_articles.map(&:article_id)).to_json};
+
     function update_delta(input) {
       var units = $(input).val();
       var expected = $(input).data('units-expected');
@@ -32,9 +34,13 @@
         update_delta(this);
       });
 
-      $('#add_article').removeAttr('disabled').select2({
+      init_add_article('#add_article');
+    });
+
+    function init_add_article(sel) {
+      $(sel).removeAttr('disabled').select2({
         placeholder: '#{t '.add_article'}',
-        data: #{articles_for_select2(@order).to_json},
+        data: new_article_data,
         // TODO implement adding a new article, like in deliveries
       }).on('change', function(e) {
         var selectedArticle = $(e.currentTarget).select2('data');
@@ -48,11 +54,17 @@
           data: {article_id: selectedArticle.id},
           contentType: 'application/json; charset=UTF-8'
         });
+        // clear selection
         $('#add_article').select2('data', null);
+        // remove newly added item from list of items
+        new_article_data = $.grep(new_article_data, function(el, i) {
+          return el.id != selectedArticle.id;
+        });
+        init_add_article(sel)
         return true;
       });
+    }
 
-    });
 
 
 %table.ordered-articles.table.table-striped.stupidtable