Check attendant number when joining and leaving an item. TODO: Fix deleting an item by separate deleting the entity outside the transaction. Return HTTP.StatusNotFound if an item is deleted when the owner leaves the group. Implement other Google Cloud Messaging functions according to this application, ex, item details, attend and leave an item.
Check attendant number when joining and leaving an item. TODO: Fix deleting an item by separate deleting the entity outside the transaction. Return HTTP.StatusNotFound if an item is deleted when the owner leaves the group. Implement other Google Cloud Messaging functions according to this application, ex, item details, attend and leave an item.

junglesung/Aliza