implement joining table

app/models/list.rb

@@ -5,6 +5,8 @@ class List
   property :needs_help, type: :boolean, default: false
   property :needs_payment, type: :boolean, default: false
   property :closed_at, type: Time
+  property :join_requests, type: Array, default: []
+
   has_many :orders, dependent: :destroy
   belongs_to :table
   belongs_to :supplier
@@ -16,6 +18,12 @@ class List
 
   view :by_supplier_id_and_id, key: [:supplier_id, :_id]
 
+  view :active_by_table_id, type: :custom, map_function: %|function(doc){
+    if(doc.ruby_class == 'List' && doc.state == 'active'){
+      emit(doc.table_id, 1); 
+    }
+  }|, reduce_function: '_sum'
+
   def self.from_table table, user
     return if user.has_active_list?
     list = new table: table, supplier_id: table.supplier_id, section_id: table.section_id