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notj
Post Prodigy
Post Prodigy

ClearCollect not working as intended

Here is my formula.

ClearCollect(RecentItems, 
ForAll(MyEditFacilities, Filter(SPSource, FacilityCode=FacilityCode)));

Unfortunately it's returning 0 items. I've confirmed that there is data in the SPSource that has a FacilityCode that matches the FacilityCode in the record in the collection of MyEditFacilities. 

17 REPLIES 17
notj
Post Prodigy
Post Prodigy

I answered, I just didn't have a good way of picking a resulting code block.

Here. The items I'm looking to collect are like: 

notj_0-1608234539819.png

 

RandyHayes
Super User
Super User

@notj 

Strange...I got an email notice that had your most recent reply in it, but it is not showing up in here.

It appears from the email that you had a picture or something - can't see it in the email.

 

Anyway, it is not so important what the items look like, it is what you want your results to look like in your collection.

 

So, on my last response I gave a formula that is based on what you had in your first posting.  That will give results based on what you are stating.

Give that a go and see if that gets you what you want.

 

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notj
Post Prodigy
Post Prodigy

I don't believe that will work. I'm not looking for a list of FacilityCodes; or Facilities. I just want the entire SP List Item returned/Collected if the FacilityCode matches in the collection and in the SP List Item.

I'm not looking for a table of Facilities to be returned.

 

Consider the SP List to just be a list of names of people in a department and their favorite color. 


I have a collection named FavoriteColorsICareAbout and I want to collect every record where that persons color matches. 

 

Your 4th code block would be an example of how the item should look.

RandyHayes
Super User
Super User

@notj 

Got it now (the picture). It was not showing up here in the forum even though I had the notice...sometimes it lags a bit.

Yep...this is the kind of information I was fishing for...There is a distinct difference between the two and each has their purpose.  I was just not clear on yours.

This formula then:

ClearCollect(RecentItems, 
    Ungroup
        ForAll(MyEditFacilities As _MEF, 
            {_records: Filter(SPSource, FacilityCode=_MEF.FacilityCode)}
        ),
        "_records"
    )
);

 

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NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
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notj
Post Prodigy
Post Prodigy

I had to add an opening parentheses in there after Ungroup, but that worked. I've never used Ungroup. 

 

I don't really understand what it does. Can you tell me what is happening differently in this vs. what I had posted in my original question? I can obviously see the literal difference, but I can't tell why mine didn't work and this Ungroup part fixed it.

RandyHayes
Super User
Super User

@notj 

Oops, sorry - a typo.  I have to write these formulas by hand here in the forum without the aid of the Formula Editor in PowerApps...so, sometimes the typos slip in.

 

So here is what to know about your formula...

ForAll returns a table, that's what it is for.  Too often used as an For Loop, but it returns tables. 

Your ClearCollect is expecting records or tables to assign to the RecentItems collection, so the ForAll is just fine for that.

Now...with that known - ForAll expects two parameters, the first is the table to iterate over and the second, the formula to apply to each iteration.

In your case you specified MyEditFacilities as the table to iterate over.  So, it will iterate over every record in that table.  You can specify ANYTHING that is a table in that parameter, such as Sequence, Filter, etc.

 

The next parameter is what you want to return in each record from your ForAll.  Your original formula used Filter.  Filter returns a table, you cannot simply return a table into a record that will be in a table.  In the second to last formula I provided, we actually named the column as Facilities. 

If you are not familiar with it, the curly brackets specify the record.

So, the would have returned a table like this:

    {Facilities: [ {ID:1, FacilityCode:"AAA"}, {ID:2, FacilityCode:"AAA"}, {ID:6, FacilityCode:"AAA"} ] },
    {Facilities: [ {ID:3, FacilityCode:"BBB"}, {ID:5, FacilityCode:"BBB"} ]  },
    {Facilities: [ {ID:4, FacilityCode:"CCC"} ] }

Note, the square brackets specify the Table (this is all JSON under the covers).  

So, your ForAll would be returning a table with one record for each iteration over the MyEditFacilities.  That record would contain a Facilities column with the Table of all of the items returned from the Filter (remember Filter returns a table).

 

Soooo...with that all said, the Ungroup is the opposite of Group.  With Group we can group records based on distinct values of a particular column.  Ungroup lets you turn that group the other way.  So in your case we did the ungroup on the Facilities column in the above table.  This will pull all of the Facilities columns out into the underlying tables.  And thus, you end up with the following:

    {ID:1, FacilityCode:"AAA"}, 
    {ID:2, FacilityCode:"AAA"}, 
    {ID:6, FacilityCode:"AAA"},
    {ID:3, FacilityCode:"BBB"}, 
    {ID:5, FacilityCode:"BBB"},
    {ID:4, FacilityCode:"CCC"}

 

The only final point to mention...Ungroup returns a Table...so this is what we want to use for the Collection

(Note: you could also assign to a variable, or directly to an Items property of a control without the collection).

 

I hope that is relatively clear.  Getting to understand JSON syntax and the way that Tables and Records are used is highly important to understand as almost everything in PowerApps uses it.

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notj
Post Prodigy
Post Prodigy

Thank you so much for the explanation and resolving the issue I was having!

RandyHayes
Super User
Super User

@notj 

No problem...sorry to ask so many times, but as you see now, there is a distinction based on what the end results were intended to be.  Some need it one way, others a different.

Keep on PowerApping...

_____________________________________________________________________________________
Digging it? - Click on the Thumbs Up below. Solved your problem? - Click on Accept as Solution below. Others seeking the same answers will be happy you did.
NOTE: My normal response times will be Mon to Fri from 1 PM to 10 PM UTC (and lots of other times too!)
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Really want to show your appreciation? Buy Me A Cup Of Coffee!

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