many changes

app/models/product_category.rb

@@ -5,10 +5,41 @@ class ProductCategory
   property :position, type: Fixnum, default: 0
 
   belongs_to :supplier
-  has_many :products 
+  has_and_belongs_to_many :products, storing_keys: true
 
   attr_protected :supplier_id
 
   validates :position, numericality: true
   validates :supplier_id, presence: true
+
+  def self.for_user(user, options = {})
+    table = options[:table]
+    raise "ProductCategory.for_user requires a table" unless table.present?
+    list = options[:list] || table.active_list
+
+    # Get supplier objects
+    products = table.supplier.products
+    product_categories = table.supplier.product_categories || []
+
+    # sort categories
+    product_categories.sort_by!{|pc| (pc.position || 90000).to_i }
+
+    # Append other category if not defined by supplier
+    other = product_categories.find(&:other?) || (product_categories << self.other).last # Container for non categorized products
+
+    # Initialize base return object
+    h = {table_number: table.number, supplier_name: table.supplier.name, my_list: list.try(:user_ids).to_a.include?(user.id)}
+
+    (products - product_categories.map(&:products).flatten).each{ |p| other.add_product(p) }
+      
+    h[:categories] = product_categories.map{|pc| {name: pc.name, products: pc.products.to_a.map{|p| p.as_json}}}.select{|pc| pc && pc[:products].present?}
+    h
+  end
+
+  def other?
+    %w[other overig].include?(name.to_s.downcase)
+  end
+  def self.other(options = {})
+    new(options.reverse_merge(name: I18n.t('user.product_category.other_name')))
+  end
 end