filtering a collection on an empty date impossible

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Posted on by HansHeintz

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I have loaded some records based on a search name into a collection and let this be the items of a gallery.

ClearCollect(ZoekDieren;SortByColumns(Filter('[dbo].[dier]_1';naam = eZoekTekst.Text);"identificatie_nummer_asiel";Descending))

This goes fine.

Now I want to filter this collection further by looking up a date in another tasble and only show when this dat is empty:

ClearCollect(ZoekDieren;Filter(ZoekDieren;Day(LookUp('[dbo].[asiel_verblijf]';dier_id=dier_id;vertrek_datum))=0))

The name dier_id is the same for the table from the first code (and thus the collection) and fot the target table '[dbo].[asiel_verblijf]', that is way dier_id=dier_id.

Should I disambiguate this and how?
Setting the filter to isblank(vertrek_datum) of vertrek_datum=0 doesn't help at all.

If I say vertrek_datum>0 I get all records so there is not some deep fundamental flaw to the approach I would say.

Working with values being blank and especially dates is a real pita in powerapps imho. Costs a lot of time.

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yashag2255 24,769 Super User 2024 Season 1 on at

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@HansHeintz

Can you try to modify your expression as:

ClearCollect(ZoekDieren;Filter(ZoekDieren;!IsBlank(LookUp('[dbo].[asiel_verblijf]';dier_id=dier_id;vertrek_datum)))

Hope this Helps!

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v-xida-msft Microsoft Employee on at

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Hi @HansHeintz ,

Could you please share a bit more about the "vertrek_datum" column in your '[dbo].[asiel_verblijf]' table? Is it a Date time type column?

Based on the formula that you mentioned, I think there is something wrong with it. I have made a test on my side, please consider take a try with the following workaround:

Please consider modify your formula as below:

ClearCollect(
ZoekDieren;
Filter(
ZoekDieren;
dier_id in Filter('[dbo].[asiel_verblijf]'; IsBlank(vertrek_datum)).dier_id
)
)

Or

ClearCollect(
ZoekDieren;
Filter(ZoekDieren; IsBlank(LookUp('[dbo].[asiel_verblijf]'; dier_id = ZoekDieren[@dier_id]; vertrek_datum)))
)

In addition, if the "vertrek_datum" column is a Date time volumn in your '[dbo].[asiel_verblijf]' table, I agree with your thought almost, please consider use Disambiguate operator within your formula. Please modify your formula as below:

ClearCollect(
ZoekDieren;
Filter(
ZoekDieren;
Day(LookUp('[dbo].[asiel_verblijf]'; dier_id = ZoekDieren[@dier_id]; vertrek_datum)) = 0
)
)

Please consider take a try with above solution, then check if the issue is solved.

Best regards,

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