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Stop Double Booking

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Posted on by Vishwanth

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I have a "BikeBook" list where users can book bikes. When a new item is created, I want to check the values of BikeName, BookingDate, and BookingStartTime. If another item is created with the same BikeName, BookingDate, and BookingStartTime, the item should not be created, and an error message should be displayed. I want to prevent double booking for the same bike, on the same date, and at the same time. How can I achieve this using Power Automate?

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Expiscornovus 33,498 Most Valuable Professional on at

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Hi @CU20121334-0,

Normally my suggestion in this scenario would be to not use Power Automate for this, because the item is already created. So, you are not preventing it from being created but you are checking if it is duplicate and deleting it afterwards.

If you really want to prevent that it is being created I would suggest to handle the input side of things (in other words the form). In that case a Power Apps app would be a way of dealing with this requirement. In that product you can validate the input before actually are creating the item.

However, if you still want to delete duplicates afterwards you could use a Filter Query in a Get Items for that in a Power Automate cloud flow.

Below is an example of that approach.

1. The below is used for the Filter query of the Get Items. It checks that other items don't have the same ID and if the other fields are the same.

(ID ne @{triggerOutputs()?['body/ID']}) and (BikeName eq '@{triggerBody()?['BikeName']}') and (BookingDate eq '@{triggerBody()?['BookingDate']}') and (BookingStartTime eq '@{triggerBody()?['BookingStartTime']}')

2. In the condition a check is done if any duplicates are found

length(outputs('Get_items')?['body/value'])

3. If that is the case, the newly created is deleted. Make sure you select the correct ID from the trigger action.

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Vishwanth 2 on at

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Hi @Expiscornovus

Thank you so much for your in-depth explanation and details. I have tried it, and as suggested by you, I would like to go with PowerApps (Form). I would also like to stop the booking before creating the item itself and display an error message. Can you please guide me or provide a step-by-step guide?

we have another column , which is BookingEndTime which is a calculated column BookingStarttime + 30 min , means every booking last for 30 min .

Thank you in Advance.

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