Introduced StockTaking. TODO: Dry up the stockit/stock_takings/deliveries controllers/views!

app/models/article.rb

@@ -35,6 +35,7 @@ class Article < ActiveRecord::Base
   has_many :article_prices, :order => "created_at"
 
   named_scope :available, :conditions => {:availability => true}
+  named_scope :not_in_stock, :conditions => {:type => nil}
 
   # Validations
   validates_presence_of :name, :unit, :price, :tax, :deposit, :unit_quantity, :supplier_id, :article_category_id

app/models/stock_article.rb

@@ -30,6 +30,8 @@ class StockArticle < Article
 
   named_scope :available, :conditions => "quantity > 0"
 
+  before_destroy :check_quantity
+
   # Update the quantity of items in stock
   def update_quantity!
     update_attribute :quantity, stock_changes.collect(&:quantity).sum
@@ -46,4 +48,10 @@ class StockArticle < Article
     end
     available
   end
+
+  protected
+
+  def check_quantity
+    raise "#{name} kann nicht gelöscht werden. Der Lagerbestand ist nicht null." unless quantity == 0
+  end
 end

app/models/stock_taking.rb

@@ -0,0 +1,13 @@
+class StockTaking < ActiveRecord::Base
+
+  has_many :stock_changes, :dependent => :destroy
+  has_many :stock_articles, :through => :stock_changes
+
+  validates_presence_of :date
+
+  def stock_change_attributes=(stock_change_attributes)
+    for attributes in stock_change_attributes
+      stock_changes.build(attributes) unless attributes[:quantity].to_i == 0
+    end
+  end
+end