URGENT - Lookup before patching

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Posted on by Kosenurm

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Hi there,

I really have to get this right as its for an urgent business case.

I have a very basic Dataverse table which will be patched OnSelect of a button like below

Patch(DVTABLENAME, Defaults(DVTABLENAME),
{Name: User().FullName},
{Email: User().Email},
{'Office Location': Dropdown8.Selected.Value},
{'Date': DatePicker1.SelectedDate},
{'Redemption': "Unredeemed"});

But we need to ensure that a user can only make ONE reservation/patch per SelectedDate in the DatePicker control. If they try to click submit more than once, throw them an error message.

How can I do this so that I look up the colleague's email address AND the chosen date on the Dataverse table and, only if a row does not exist currently with these two elements, allow the patch?

Many thanks

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Microsoft Dataverse with Power Apps

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meelamri 468 on at

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Hello @Kosenurm ,

I think you can do a server side validation. This will send the error message back to your application.

At first sight, I would consider a validation using a plugin that will run in pre-validation.

Please tick Accept as solution if the answer is useful.

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Kosenurm 802 on at

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Thanks, I need really just a simple lookup though as a quick and dirty solution - so that an error message displays if they already have a record in the table with the chosen date and email.

Any ideas?

Thanks

K.

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meelamri 468 on at

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So maybe you can make the a validation when users change the values and display the submit button only if the values is correct.

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AhmedSalih

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Hello, @Kosenurm, Add a Label with your desired error Message wherever you want the error message to appear. Then, in the error message Label Visible Property add theis formula:

If(!IsBlank(LookUp(DVTABLENAME, 'Date'=DatePicker1.SelectedDate && Email=User().Email,'Date')),true,false)

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