Canvas App Gallery - filter items from one entity based on another

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Posted on by CrystalShardz

Hi,

I'm trying to create a pool car booking app where by it forces people to share cars where available.

I have a form which asks for the users:

collection point
destination
collection time
return time

This then needs to display a gallery which contains a list of available cars (if there are any) which the user can then select.

My entities are:

Pool Car

Registration

Base Site

Available (yes/no)

Pool Car Bookings

Pool Car (related entity)

Start Date(date/time)

End Date (date/time)

destination(text)

I'm struggling to filter the gallery items based on the form.

In SQL I'd look to do something like this:

SELECT * FROM poolCars c WHERE NOT EXISTS( SELECT * FROM
	bookings b
	WHERE 
	(DATE_FORMAT(b.startDate, "%Y-%m-%d") = CURDATE() 
		AND b.passengers >= c.seats
	)
	AND b.poolCar_id = c.id
)

however I am unsure how to do this in PowerApps. Any ideas?

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Building Power Apps

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WarrenBelz 154,928 Most Valuable Professional on at

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Hi @CrystalShardz ,
I will call the fields below
DestinationTxt
Pickup
Return
For the moment, I will assume you are using (for the last two) the standard three element (Date, Hour, Minute) controls generated by PowerApps when adding a Date/Time card. I have not done any error control as all three items would need to be completed. You have mentioned some other parameters in your SQL, but I will deal with the three above to give you an idea of the syntax required for displaying all a list of cars that are going to a destination and leaving withing 30 minutes either side of the selected date/time and arriving within the same tolerance. I believe also you would need to query PoolCarBookings
Filter( PoolCarBookings, Destination = DestinationTxt.Text && Abs( DateDiff( Pickup.SelectedDate + Time( Value(Pickup.SelectedText.Value), Value(Pickup.SelectedText.Value), 0 ), StartDate, Minutes )< 30 && Abs( DateDiff( Return.SelectedDate + Time( Value(Return.SelectedText.Value), Value(Return.SelectedText.Value), 0 ), EndDate, Minutes )< 30 )
Incidentally, if you use SharePoint as a backend, MS Access connects directly and all your SQL works perfectly - I use it extensively for generating Excel reports and also for dashboards.

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CrystalShardz 5 on at

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Thanks for the code snippet 🙂 With your help i've managed to get what I was intending to work in my app.

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