cart now functional without bugs (at least the ones we know about)

fixed a small issue with ItemGroup REST call

front-api/controllers/item.rb

@@ -1,7 +1,7 @@
-def prepare_items_for_mass_display(items) 
+def prepare_items_for_mass_display(items)
   items.to_json(
      :except => [:created_at, :current_input_price, :stock, :on_display],
-     :include => [      
+     :include => [
       :unit ,
       :multi_media_descriptions ,
       :sub_category,
@@ -15,7 +15,7 @@ end
 
 
 # gets single item for detailed display (like comments etc. ) # TODO: change when comments are added
-get '/item/:id' do |id_s| 
+get '/item/:id' do |id_s|
   item = Item.find(id_s.to_i)
   prepare_items_for_mass_display(item)
 end
@@ -32,7 +32,7 @@ end
 get '/item/offset/:offset/limit/:limit' do |offset_s, limit_s|
   offset, limit = mass_to_i(offset_s, limit_s)
   return [].to_json if offset_and_limit_invalid?(offset,limit)
-  
+
   items = Item.best_selling(offset,limit)
   prepare_items_for_mass_display(items)
 end
@@ -42,8 +42,8 @@ end
 get '/item/section/:section_id/offset/:offset/limit/:limit' do |section_id_s, offset_s, limit_s|
   section_id, offset, limit = mass_to_i(section_id_s, offset_s, limit_s)
   input_invalid = offset_and_limit_invalid?(offset,limit) or section_id <= 0
-  return [].to_json if input_invalid 
-  
+  return [].to_json if input_invalid
+
   items = Item.best_selling_in_section(section_id, offset, limit)
   prepare_items_for_mass_display(items)
 end
@@ -53,7 +53,7 @@ end
 get '/item/category/:category_id/offset/:offset/limit/:limit' do |category_id_s, offset_s, limit_s|
   category_id, offset, limit = mass_to_i(category_id_s, offset_s, limit_s)
   input_invalid = offset_and_limit_invalid?(offset,limit) or category_id <= 0
-  return [].to_json if input_invalid 
+  return [].to_json if input_invalid
 
   all_in_cat = filter_by_traits(Item.all_in_category(category_id))
   items = Item.best_selling_in_category(category_id, offset,limit)
@@ -69,13 +69,13 @@ get '/item/sub_category/:sub_category_id/offset/:offset/limit/:limit' do |sub_ca
 
   sub_category_id, offset, limit = mass_to_i(sub_category_id_s, offset_s, limit_s)
   input_invalid = offset_and_limit_invalid?(offset,limit) or sub_category_id <= 0
-  return [].to_json if input_invalid 
+  return [].to_json if input_invalid
 
   all_in_sub_cat = filter_by_traits(Item.all_in_sub_category(sub_category_id))
 
   items = Item.best_selling_in_sub_category(sub_category_id, offset, limit)
   items = filter_by_traits(items)
-  
+
   add_total_count_header(all_in_sub_cat.count)
 
   prepare_items_for_mass_display(items)
@@ -83,13 +83,13 @@ end
 
 
 # gets list of items in cart without count
-get '/cart/item_details' do 
+get '/cart/item_details' do
   cart = Cart.find_or_create(anonymous_id, -1)
   item_ids = cart.item_in_carts.map do |x|
    x.item_id
   end
   items = []
-  items = Item.find(item_ids) if cart.item_in_carts.length > 0 
+  items = Item.find(item_ids) if cart.item_in_carts.length > 0
   prepare_items_for_mass_display(items)
 end
 
@@ -98,8 +98,9 @@ end
 get '/item/item_group/:item_group_id/offset/:offset/limit/:limit' do |item_group_id_s, offset_s, limit_s|
   item_group_id, offset, limit = mass_to_i(item_group_id_s, offset_s, limit_s)
   input_invalid = offset_and_limit_invalid?(offset,limit) or item_group_id <= 0
-  return [].to_json if input_invalid 
+  return [].to_json if input_invalid
 
-  items = ItemGroup.find(item_group_id).all_items(offset, limit)
-  prepare_items_for_mass_display(items)
+  items = ItemGroup.find_by_id(item_group_id)
+  return [].to_json if items.nil?
+  prepare_items_for_mass_display(items.all_items(offset, limit))
 end