cancel
Showing results for 
Search instead for 
Did you mean: 
Reply
lmheimendinger
Resolver IV
Resolver IV

Patch in Forall failing to update

I have been wrestling with trying to update a collection.  Let me describe the problem I am trying to solve.

 

I have a SharePoint list that has one record corresponding to some buttons that I will use in various Power Apps.  Based on user shared access to other Power Apps - each button corresponds to a different app - I want to update NOT THE LIST but a collection created from the list.  Why? Because multiple logons for the same or differnt apps that use the list could run at the same time.

 

Here's what I do:

 

  1. ClearCollect(col1, SharePoit list) - get list into collection
  2. ClearCollect(col2, coll1) - get a copy to use in ForAll
  3. ClearCollect(colSeq,Sequence(CountRows(col1))) - get a sequence of integers 1 to number of rows in list
  4. Set(varSeq, Sequence(CountRows(colNavigate))) - variable as an array

In the list and col1 and col2, the IDs all start at 1 and increase by 1 for all rows, so the ID matches the sequence array.  There is also another column for the list and collections called ButtonID which is an integer that corresponds to the ID (but is just a number column with 0 decimal places).  The reason for the sequence, I thought, was that in the ForAll I could by trimming the first row of the array it would always match the collection row in ForAll.  Apparantly that works as in testing I create an array row containng the sequence number and buttonid and they match.

Here is then what I try to do:

ForAll(col1,
   Patch(col2, LookUp(col2,ThisRecord.Title=Title, {UserOK:TestPermissions.Run(varUser,'App ID').result}));
   Remove(colSeq,First(colSeq))
)

The Power Automate is a flow that tests each app ID passed to it (in the SharePoint list and collections) and returns a "Yes" or "No" text to indicate if the user has shared permissions for that app.  I can look at the run history for that flow and see that it is successful and returns the desired value for each row in the list.  But the collection never gets updated.

 

I have tried other values in LookUp() all of which were equally unsuccessful, such as ID=ID or Title=Title or ButtonID=ButtonID.  I thought ID=First(colSeq).Value would be the thing I actually want but get  a type mismatch of Number = Table.

 

Why do this?  I want a gallery to have a list of allowable buttons displayed (along with other data), so filtering the gallery toonly include UserOK = "Yes" makes this a snap if I can figure out how to update the collection for the gallery.....

 

I realize I am probably doing something stupod, but what?

 

3 REPLIES 3
RandyHayes
Super User
Super User

@lmheimendinger 

To start, your formula has the ForAll backward. You are trying to use it like a ForLoop in some development language - which PowerApps is not.  ForAll is a function that returns a table of records based on your iteration table and record schema.

It is more efficient to use the function as intended and will provide better performance.

 

Also, trying to look at the For All as a ForLoop is causing you to chase your tail trying to make it work like one...as I am guessing you are feeling at this point be trying this and that to deal with so many duplicates of collection tables and trying to index it with another.

 

My first suggestion beyond that is to modify your flow to accept a list of apps rather than just a single app.  The reason for that is, most ALL function in PowerApps accept tables as parameters (ie. Patch in this case).  If you have a flow that only handles a single record, then you are forced to use the ForAll backward and then the flow has to be instantiated over and over again.  This is excessive use of your flows and also a performance hog!

 

Not entirely understanding your source data and the need for sequences and ID's that match the existing ID, but without that your formula can be changed to:

ClearCollect(colAppList,
    ForAll(SharePointList,
        {
        Title: Title,
        'App ID': 'App ID',
        UserOK: TestPermissions.Run(varUser,'App ID').result
        }
     )
)

This would provide a collection (in memory database table) of the list apps and the permissions for the users.

 

If you are not planning to alter the records in memory in your app, then you can skip the collection and just assign to a variable:

Set(glbAppList,
    ForAll(SharePointList,
        {
        Title: Title,
        'App ID': 'App ID',
        UserOK: TestPermissions.Run(varUser,'App ID').result
        }
     )
)

 

I hope this is helpful for you.

_____________________________________________________________________________________
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!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!

A lot to parse but thanks and I will advise on progress or failures.  

 

Question: in the Set(gblAppList,....) sugesstion, that should result in an array, right?  I still have the problem of using the results to filter the gallery.

 

Question:  what exactly do you mean by "backwards" use of ForAll?  Am I incorrect to believe that as I have used it, it iterates though col1 (which is identical to col2) but the Patch operates on col2 as a corresponding row?  I know I can't Patcvh col1 in the ForAll which is why I duplicated it in col2.

RandyHayes
Super User
Super User

@lmheimendinger 

When you say array...there really is not that in PowerApps...it is a table.  And so yes, glbAppList would be a table.  Tables can be in variables.  Those tables can be used on any component that needs a table (like your gallery).

 

Oh the ForAll - one of my favorite functions in PowerApps (when used properly) as it is the most powerful data tools in the arsenal of functions!

 

ForAll is a function that returns a table.  The structure is ForAll(table, {record definition})  So the table is the table that ForAll will iterate over, the record definition defines what the schema of the returned table will be.

Example:

ForAll(Sequence(10), {MyCol: Value + 5})

In the above, the table to iterate over is a table (returned from Sequence) that has a single column called Value.  We want our ForAll to iterate over that and create a table with records that have a MyCol column that contains the Value of the Sequence-returned table plus 5.  

 

One very important thing to keep in mind is that if you do NOT specify a record structure, PowerApps will automatically create a Value column.

So, for example:  ["a", "b", "c"]  will produce a table with a single column called Value (because nothing was specified.  It is equivalent to:  Table({Value: "a"}, {Value: "b"}, {Value: "c"})  (but you can see the shorthand is quicker if you are good with a Value column)

 

Likewise, if you use a ForAll with no record definition - ex: ForAll(["a", "b", "c"], "X") This will produce a table with three rows that have a single column called Value with a value of "X"

 

Why I say that is...when you use the ForAll backward, it is still creating a table, you just are wasting the output of it.

It's like putting a 2+2 in an action formula...PowerApps will still evaluate it to 4, but since you are not assigning it or using it...it is wasted.

 

When trying to use ForAll as a ForLoop (which it will mimic because it technically iterates over things), you will quickly come to hate it because that is not what it was designed for.  You cannot do things in it like in a ForLoop because (hopefully now obvious) you can't impact the source iterator while you iterate over it.  Plus, if you are putting "statements" in your ForAll rather than record information, then each is returning values that are being added to a Value column in the ForAll record...and then wasted!  This ALL contributes to added and unnecessary overhead in your app.

 

I just wish that they would modify the docs on PowerApps to NOT have examples that use the ForAll backward!  It gives people the WRONG impression on how to use it.  And since many developers flock to PowerApps with the developer mindset...the first thing they are looking for is "where's the for loop function?" - They find the ForAll and think "That's it!".  Quickly things go wrong!

 

But the biggest obstacle is the collections and the duplication of collections.   Keep in mind that each one is just a copy of the data over and over.  There is no need for all that overhead in the app.

A collection should ONLY be used in scenarios where you need to add/remove or update records in a table in memory. (or if you are building an offline app...where you do need in-memory database ability).  

 

You'll see that the last formula I provided uses no collections.  It produces a table of records (you can see the records structure in the ForAll) into a table that is stored in a variable (because it most likely does not need to be add/remove/updated later on in the app).  

 

Hopefully this all makes sense and is helpful for you.  I can go on and on about ForAll usage and Collection usage in PowerApps because they are probably one of the top two things that are misused in the platform and contribute to people doing much more work than is necessary in their design process.

 

 

 

 

_____________________________________________________________________________________
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!)
Check out my PowerApps Videos too! And, follow me on Twitter @RandyHayes

Really want to show your appreciation? Buy Me A Cup Of Coffee!

Helpful resources

Announcements

Copilot Cookbook Challenge | Week 2 Results | Win Tickets to the Power Platform Conference

We are excited to announce the "The Copilot Cookbook Community Challenge is a great way to showcase your creativity and connect with others. Plus, you could win tickets to the Power Platform Community Conference in Las Vegas in September 2024 as an amazing bonus.   Two ways to enter: 1. Copilot Studio Cookbook Gallery: https://aka.ms/CS_Copilot_Cookbook_Challenge 2. Power Apps Copilot Cookbook Gallery: https://aka.ms/PA_Copilot_Cookbook_Challenge   There will be 5 chances to qualify for the final drawing: Early Bird Entries: March 1 - June 2Week 1: June 3 - June 9Week 2: June 10 - June 16Week 3: June 17 - June 23Week 4: June 24 - June 30     At the end of each week, we will draw 5 random names from every user who has posted a qualifying Copilot Studio template, sample or demo in the Copilot Studio Cookbook or a qualifying Power Apps Copilot sample or demo in the Power Apps Copilot Cookbook. Users who are not drawn in a given week will be added to the pool for the next week. Users can qualify more than once, but no more than once per week. Four winners will be drawn at random from the total qualifying entrants. If a winner declines, we will draw again at random for the next winner.  A user will only be able to win once. If they are drawn multiple times, another user will be drawn at random. Prizes:  One Pass to the Power Platform Conference in Las Vegas, Sep. 18-20, 2024 ($1800 value, does not include travel, lodging, or any other expenses) Winners are also eligible to do a 10-minute presentation of their demo or solution in a community solutions showcase at the event. To qualify for the drawing, templates, samples or demos must be related to Copilot Studio or a Copilot feature of Power Apps, Power Automate, or Power Pages, and must demonstrate or solve a complete unique and useful business or technical problem. Power Automate and Power Pagers posts should be added to the Power Apps Cookbook. Final determination of qualifying entries is at the sole discretion of Microsoft. Weekly updates and the Final random winners will be posted in the News & Announcements section in the communities on July 29th, 2024. Did you submit entries early?  Early Bird Entries March 1 - June 2:  If you posted something in the "early bird" time frame complete this form: https://aka.ms/Copilot_Challenge_EarlyBirds if you would like to be entered in the challenge.   Week 1 Results:  Congratulations to the Week 1 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Copilot Cookbook Gallery:Power Apps Cookbook Gallery:1.  @Mathieu_Paris 1.   @SpongYe 2.  @Dhanush 2.   @Deenuji 3.  n/a3.   @Nived_Nambiar  4.  n/a4.   @ManishSolanki 5.  n/a5.    n/a   Week 2 Results:  Congratulations to the Week 2 qualifiers, you are being entered in the random drawing that will take place at the end of the challenge. Copilot Cookbook Gallery:Power Apps Cookbook Gallery:1. Kasun_Pathirana1. ManishSolanki2. cloudatica2. madlad3. n/a3. SpongYe4. n/a4. n/a5. n/a5. n/a

Win free tickets to the Power Platform Conference | Summer of Solutions

We are excited to announce the Summer of Solutions Challenge!    This challenge is kicking off on Monday, June 17th and will run for (4) weeks.  The challenge is open to all Power Platform (Power Apps, Power Automate, Copilot Studio & Power Pages) community members. We invite you to participate in a quest to provide solutions to as many questions as you can. Answers can be provided in all the communities.    Entry Period: This Challenge will consist of four weekly Entry Periods as follows (each an “Entry Period”)   - 12:00 a.m. PT on June 17, 2024 – 11:59 p.m. PT on June 23, 2024 - 12:00 a.m. PT on June 24, 2024 – 11:59 p.m. PT on June 30, 2024 - 12:00 a.m. PT on July 1, 2024 – 11:59 p.m. PT on July 7, 2024 - 12:00 a.m. PT on July 8, 2024 – 11:59 p.m. PT on July 14, 2024   Entries will be eligible for the Entry Period in which they are received and will not carryover to subsequent weekly entry periods.  You must enter into each weekly Entry Period separately.   How to Enter: We invite you to participate in a quest to provide "Accepted Solutions" to as many questions as you can. Answers can be provided in all the communities. Users must provide a solution which can be an “Accepted Solution” in the Forums in all of the communities and there are no limits to the number of “Accepted Solutions” that a member can provide for entries in this challenge, but each entry must be substantially unique and different.    Winner Selection and Prizes: At the end of each week, we will list the top ten (10) Community users which will consist of: 5 Community Members & 5 Super Users and they will advance to the final drawing. We will post each week in the News & Announcements the top 10 Solution providers.  At the end of the challenge, we will add all of the top 10 weekly names and enter them into a random drawing.  Then we will randomly select ten (10) winners (5 Community Members & 5 Super Users) from among all eligible entrants received across all weekly Entry Periods to receive the prize listed below. If a winner declines, we will draw again at random for the next winner.  A user will only be able to win once overall. If they are drawn multiple times, another user will be drawn at random.  Individuals will be contacted before the announcement with the opportunity to claim or deny the prize.  Once all of the winners have been notified, we will post in the News & Announcements of each community with the list of winners.   Each winner will receive one (1) Pass to the Power Platform Conference in Las Vegas, Sep. 18-20, 2024 ($1800 value). NOTE: Prize is for conference attendance only and any other costs such as airfare, lodging, transportation, and food are the sole responsibility of the winner. Tickets are not transferable to any other party or to next year’s event.   ** PLEASE SEE THE ATTACHED RULES for this CHALLENGE**

Celebrating the June Super User of the Month: Markus Franz

Markus Franz is a phenomenal contributor to the Power Apps Community. Super Users like Markus inspire others through their example, encouragement, and active participation.    The Why: "I do this to help others achieve what they are trying to do. As a total beginner back then without IT background I know how overwhelming things can be, so I decided to jump in and help others. I also do this to keep progressing and learning myself." Thank you, Markus Franz, for your outstanding work! Keep inspiring others and making a difference in the community! 🎉  Keep up the fantastic work! 👏👏   Markus Franz | LinkedIn  Power Apps: mmbr1606  

Your Moment to Shine: 2024 PPCC’s Got Power Awards Show

For the third year, we invite you, our talented community members, to participate in the grand 2024 Power Platform Community Conference's Got Power Awards. This event is your opportunity to showcase solutions that make a significant business impact, highlight extensive use of Power Platform products, demonstrate good governance, or tell an inspirational story. Share your success stories, inspire your peers, and show off some hidden talents.  This is your time to shine and bring your creations into the spotlight!  Make your mark, inspire others and leave a lasting impression. Sign up today for a chance to showcase your solution and win the coveted 2024 PPCC’s Got Power Award. This year we have three categories for you to participate in: Technical Solution Demo, Storytelling, and Hidden Talent.      The Technical solution demo category showcases your applications, automated workflows, copilot agentic experiences, web pages, AI capabilities, dashboards, and/or more. We want to see your most impactful Power Platform solutions!  The Storytelling category is where you can share your inspiring story, and the Hidden Talent category is where your talents (such as singing, dancing, jump roping, etc.) can shine! Submission Details:  Fill out the submission form https://aka.ms/PPCCGotPowerSignup by July 12th with details and a 2–5-minute video showcasing your Solution impact. (Please let us know you're coming to PPCC, too!)After review by a panel of Microsoft judges, the top storytellers will be invited to present a virtual demo presentation to the judges during early August. You’ll be notified soon after if you have been selected as a finalist to share your story live at PPCC’s Got Power!  The live show will feature the solution demos and storytelling talents of the top contestants, winner announcements, and the opportunity to network with your community.  It's not just a showcase for technical talent and storytelling showmanship, show it's a golden opportunity to make connections and celebrate our Community together! Let's make this a memorable event! See you there!   Mark your calendars! Date and Time: Thursday, Sept 19th Location: PPCC24 at the MGM Grand, Las Vegas, NV 

Tuesday Tip | Accepting Solutions

It's time for another TUESDAY TIPS, your weekly connection with the most insightful tips and tricks that empower both newcomers and veterans in the Power Platform Community! Every Tuesday, we bring you a curated selection of the finest advice, distilled from the resources and tools in the Community. Whether you’re a seasoned member or just getting started, Tuesday Tips are the perfect compass guiding you across the dynamic landscape of the Power Platform Community.   To enhance our collaborative environment, it's important to acknowledge when your question has been answered satisfactorily. Here's a quick guide on how to accept a solution to your questions: Find the Helpful Reply: Navigate to the reply that has effectively answered your question.Accept as Solution: Look for the "Accept as Solution" button or link, usually located at the bottom of the reply.Confirm Your Selection: Clicking this button may prompt you for confirmation. Go ahead and confirm that this is indeed the solution.Acknowledgment: Once accepted, the reply will be highlighted, and the original post will be marked as "Solved". This helps other community members find the same solution quickly. By marking a reply as an accepted solution, you not only thank the person who helped you but also make it easier for others with similar questions to find answers. Let's continue to support each other by recognizing helpful contributions. 

Reminder: To register for the Community Ambassador Call on June 13th

Calling all Super Users & User Group Leaders     Reminder: To register for the Community Ambassador Call on June 13th—for an exclusive event for User Group Leaders and Super Users! This month is packed with exciting updates and activities within our community.   What's Happening: Community Updates: We'll share the latest developments and what's new in our vibrant community.Special Guest Speaker: Get ready for an insightful talk and live demo of Microsoft Copilot Studio templates by our special guest.Regular Updates: Stay informed with our routine updates for User Groups and Super Users.Community Insights: We'll provide general information about ongoing and upcoming community initiatives. Don't Miss Out: Register Now: Choose the session that fits your schedule best.Check your private messages or Super User Forum for registration links. We're excited to connect with you and continue building a stronger community together.   See you at the call!  

Top Solution Authors
Top Kudoed Authors
Users online (5,650)