Add payment structure

app/models/list.rb

@@ -17,6 +17,7 @@ class List
   belongs_to :table
   belongs_to :supplier
   belongs_to :section
+  has_many :list_payments
   has_and_belongs_to_many :users, storing_keys: true
   has_and_belongs_to_many :employees, storing_keys: true
 
@@ -274,6 +275,10 @@ class List
     state == 'active'
   end
 
+  def closed?
+    state == 'closed'
+  end
+
   def place_order(product_orders: [], user: nil, employee: nil)
     return false unless product_orders.any?
     order = Order.create list: self, supplier: supplier, user: user, employee: employee, section_id: section_id, table_id: table_id