Replace couchbase counters with drb version

app/models/list/join_requests.rb

@@ -0,0 +1,51 @@
+class List
+  module JoinRequests
+    extend ActiveSupport::Concern
+    included do
+      property :join_request_user_ids, type: Array, default: []
+    end
+
+    def join_request_for_user(user)
+      JoinRequest.new(user: user, list: self)
+    end
+
+    def join_requests
+      @join_requests ||= join_request_user_ids.any? ? self.class.database.load_document(join_request_user_ids).map{|user| join_request_for_user(user) } : []
+    end
+
+    def send_table_join_request_for_user!(requester)
+      unless join_request_user_ids.include?(requester.id) or user_ids.include?(requester.id)
+        @join_requests = nil # bust cache
+        self.join_request_user_ids << requester.id
+        self.is_dirty
+        if save
+          broadcast_users 'user_join_request', JoinRequestSerializer.new(join_request_for_user(requester)).as_json
+        end
+      end
+    end
+
+    def approve_join_request_for_user!(user)
+      if join_request_user_ids.include?(user.id)
+        join_request_user_ids.delete(user.id)
+        user.active_list_id = self.id
+        add_user(user)
+        user.save
+        self.is_dirty
+        save and broadcast_users 'join_request_approved', UserUserSerializer.new(user).as_json
+      end
+    end
+
+    def reject_join_request_for_user!(user_id)
+      user_id = user_id.id if user_id.is_a?(User) # allow model to be passed as argument
+      if join_request_user_ids.include?(user_id)
+        join_request_user_ids.delete(user_id)
+        self.is_dirty
+        if save
+          # user_id is not part of the list, so should be broadcasted separately
+          broadcast_user user_id, 'join_request_rejected', id: "jr-#{user_id}"
+          broadcast_users 'join_request_rejected', id: "jr-#{user_id}"
+        end
+      end
+    end
+  end
+end