Handle conflict when i create an event which already exist (double books slots)

Question

I use Microsoft graph on the endpoint me/calendar/events and i would like to have an error when i try to create an event which is already booked. I need to stop the double books slot. I think microsoft graph don't handle this case.

Kind regards,
Pierre ACKER
Web developer

Answer 1

Hi @Pierre acker ,

Outlook client/web allows double booking i.e., allows to book/create event more than 1 appointment with same participants at same time, and while booking it will show the availability of the participants as tentative/unavailable but still allows to send invite.

You can however use calendar-getschedule to know free/busy availability information for a collection of users, distributions lists, or resources (rooms or equipment) for a specified time period.

POST https://graph.microsoft.com/v1.0/me/calendar/getSchedule   
Prefer: outlook.timezone="Pacific Standard Time"  
Content-Type: application/json  
  
{          
    "schedules": ["******@contoso.onmicrosoft.com", "******@contoso.onmicrosoft.com"],  
    "startTime": {  
        "dateTime": "2019-03-15T09:00:00",  
        "timeZone": "Pacific Standard Time"  
    },  
    "endTime": {  
        "dateTime": "2019-03-15T18:00:00",  
        "timeZone": "Pacific Standard Time"  
    },  
    "availabilityViewInterval": 60  
}  

Additional references findmeetingtimes.

Hope this helps,

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have further questions about this answer, please click "Comment".