I am developing a Booking System and I am having a issue i.e. How can I prevent duplicate events to be registered ?
Right now I am using: Calendar and Date for the event management and Entity Form for the booking system.
Users book a date and a time (for example: 09 / 10 / 2014, 14:30 and this is done with the Date field)
The problem I am facing that I don't want to let the users book a date and hour that is already selected. How can I prevent that?
For example: If an user books 09 / 10 / 2014, 14:30, no other user can book for the same date and time. How can i achieve this? Entity Forms has the option to set rules (via the rules module) but my knowledge on rules is not that good. Hope someone could give me a hint. Thanks in advance.