section improvements, area elements mostly

app/models/section.rb

@@ -11,6 +11,7 @@ class Section
   has_many :lists
   has_many :orders
   has_many :section_elements
+  has_many :section_areas
 
   attr_protected :supplier_id
 
@@ -99,7 +100,7 @@ class Section
     @for_tables_as_json = h
   end
 
-  def arrange_tables_in_grid
+  def arrange_tables_in_grid(tables = self.tables)
     w = width
     h = height
     n = tables.size

app/models/section_area.rb

@@ -0,0 +1,18 @@
+class SectionArea
+  include SimplyStored::Couch
+  include ActiveModel::SerializerSupport
+  property :title
+  property :width, type: Float, default: 2
+  property :height, type: Float, default: 2
+  property :position_x, type: Float, default: 0
+  property :position_y, type: Float, default: 0
+  property :rounded, type: :boolean, default: false
+  belongs_to :section
+  belongs_to :supplier
+
+  view :by_supplier_id, key: :supplier_id
+
+  def self.for_supplier(supplier)
+    find_all_by_supplier_id(supplier.id)
+  end
+end