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SIDOU
Frequent Visitor

use of THISRECORD within LOOKUP to reference FORALL record above

Hello, 

Please I have a Table Named Test2 which contains the following columns: 'Train-ID', 'TRK', 'Location'.

for any Train-ID there are two rows (one for Location1, and second for Location2).

I want to filter Test2 to get only Train-ID Which stratified the following condition:

at Location1 the TRK="1" And at Location2 the TRK="3".

I tried to use the following code but it does not work:

FORALL(
Filter(
Test2,
Location = "Location1" And TRK="1" ),
If( !ISBLANK(LOOKUP(
Test2,
Location="Location2" And TRAIN=THISRECORD.TRAIN , TRK)="3"),

Collect(Movement, THISRECORD))
)
)

I'm a new user to power apps and coding, so please give me a detailed explanation which will be a learning opportunity for me.

Thank you in advance for your help

1 ACCEPTED SOLUTION

Accepted Solutions
BCBuizer
Multi Super User
Multi Super User

Hi @SIDOU ,

 

To add the return of the LookUp function to the collection you can chain a second Collect function after the first that contains the same Lookup, or you can use a With function to evaluate the LookUp once and then use the result both in the If function and the second Collect function:

Clear(Movement);

ForAll(
	Filter(
		Test2,
		Location = "Location1" && TRK = "1" 
	) As _Records1,
	With({
		_Records2: LookUp(
			Test2,
			Location = "Location2" && TRAIN= _Records1.TRAIN && TRK = "3"
		)},
		If( 
			!IsBlank(_Records2),
			Collect(Movement, _Records1);
			Collect(Movement, _Records2)
		)
	)
)

 



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View solution in original post

8 REPLIES 8
SpongYe
Super User
Super User

Hi @SIDOU 

 

First of all, as a new user you came pretty far with this. 

 

So in the first part of the the Forall() we filter the data Location = "Location1" And TRK="1".

In the second part we CountRows the records found in the LookUp. We convert the output of the LookUp from Text to Value and then if it is 3 then we Collect the ThisItem.

FORALL(
    Filter(
        Test2,
        Location = "Location1" And TRK="1" 
    ),
    If( 
        CountRows(
            Value(LOOKUP(Test2,Location="Location2" And TRAIN=THISRECORD.TRAIN , TRK))
        ) = 3,
        Collect(Movement, THISRECORD)
    )
)

 

-----------------------
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BCBuizer
Multi Super User
Multi Super User

Hi @SIDOU ,

 

Whilst in theory this should work, I run into issues all the time, so I use the As operator to override ThisRecord (https://learn.microsoft.com/en-us/power-platform/power-fx/reference/operators) :

 

ForAll(
	Filter(
		Test2,
		Location = "Location1" && TRK = "1" 
	) As _Records,
	If( 
		!IsBlank(
			LookUp(
				Test2,
				Location = "Location2" && TRAIN= _Records.TRAIN ,
				TRK
			) = "3" 
		),
		Collect(Movement, _Records))
	)
)

 

 

A thing I notice though is that you have something weird going on in the conditions for your If formula where first you perform a LookUp, then check if the TRK column of the returned record equals "3".... and then checks if the result of that condition !IsBlank...

 

 



Did you like my post? Please give it a thumbs up! Did I resolve your issue? Please click Accept as Solution to close the topic and so other members of the community can find solutions more easily.

Hi, Actually I do not want count the rows, what I want is that to take from the Filte(Test2...

only the records which satisfy the condition of the If() below. my table has the Train_ID and for each Train_ID there are two locations "Location1" and "Location2", which means for 

 

I

Train_IDLocationTRK
train1location11
train1location21
train2location11
train2location23
train3location12

I want my code to retrieve only train2 rows because it is the only one which satisfied the condition: at location1 the TRK=1 and at location2 the TRK=3

thank you

actualy I tried the As but it did not work. below is a detailed of what I want:

 what I want is that to take from the Filte(Test2...

only the records which satisfy the condition of the If() below. my table has the Train_ID and for each Train_ID there are two locations "Location1" and "Location2", which means for 

 

I

Train_IDLocationTRK
train1location11
train1location21
train2location11
train2location23
train3location12

I want my code to retrieve only train2 rows because it is the only one which satisfied the condition: at location1 the TRK=1 and at location2 the TRK=3

thank you

Hi @SIDOU ,

 

Please try this then:

ForAll(
	Filter(
		Test2,
		Location = "Location1" && TRK = "1" 
	) As _Records,
	If( 
		!IsBlank(
			LookUp(
				Test2,
				Location = "Location2" && TRAIN= _Records.TRAIN && TRK = "3"
			) 
		),
		Collect(Movement, _Records))
	)
)

I made a change so TRK = "3" is now a condition for the LookUp instead of the If function.



Did you like my post? Please give it a thumbs up! Did I resolve your issue? Please click Accept as Solution to close the topic and so other members of the community can find solutions more easily.

HOOW, THANK YOU IT IS WORKING.

please, how can I also collect the record found in the lookup function to the collection Movement

BCBuizer
Multi Super User
Multi Super User

Hi @SIDOU ,

 

To add the return of the LookUp function to the collection you can chain a second Collect function after the first that contains the same Lookup, or you can use a With function to evaluate the LookUp once and then use the result both in the If function and the second Collect function:

Clear(Movement);

ForAll(
	Filter(
		Test2,
		Location = "Location1" && TRK = "1" 
	) As _Records1,
	With({
		_Records2: LookUp(
			Test2,
			Location = "Location2" && TRAIN= _Records1.TRAIN && TRK = "3"
		)},
		If( 
			!IsBlank(_Records2),
			Collect(Movement, _Records1);
			Collect(Movement, _Records2)
		)
	)
)

 



Did you like my post? Please give it a thumbs up! Did I resolve your issue? Please click Accept as Solution to close the topic and so other members of the community can find solutions more easily.
SIDOU
Frequent Visitor

THANK YOU VERY MUCH, YOU'RE A CHAMPION

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