Unanswered

Looping through a collection to patch a data source

(0) Share

Report

Posted on by Capt_Ron

I'm trying to patch a data source based on values in a collection and cannot figure out how to do it.

Here's my situation. I have a web site that has 10 pages on it. Each page has a message box where I want to post messages to. The web site is database driven and I have a table for the page information.

The table (dbo.Pages) has ID (primary key), Title, and AlertHtml columns.

My PowerApp has dbo.Pages as a data source.

I have a text box for a message, a list box for pages, and I have a gallery for styles (which gets prepended to the text box value)

I want to be able to post the message to any pages I select in the list box.

My initial thought was to put the Pages selected from the list box into a collection (colChosenPages) then loop through them and patch to dbo.Pages. But there is NO LOOP function! I looked at ForAll and Patch combinations but I don't understand how I use the matching criteria in Patch.

Here's what I was trying that does not work.

ForAll(colChosenPages,Patch('[dbo].[Pages]',Id=colChosenPages.Id,{AlertHtml:varMessageText})))

How can I add the message to the pages table for each of the pages chosen in the list box?

Thank you

Categories:

Building Power Apps

I have the same question (0)

All responses (6)

Answers (1)

yashag2255 24,769 Super User 2024 Season 1 on at

Like (0)

Report

Hey!

Please refer to the screenshot below:

In this scenario we are patching new records into the db table, based on selected value in listbox and search text;
and the gallery is displaying the results.

In my case, it will create new records, but if you want to update an existing one, then we need to replace the default(datasource) with the matching record, so that it gets updated.

Also, What is the gallery doing in your case? Can you please share an example of what kind of data it is prepending to the text box? It would help in better understanding the whole scenario.

Hope this Helped!

Thanks,

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!

Was this reply helpful? Yes No
Capt_Ron 74 on at

Like (0)

Report

@yashag2255 ,
Thank you.
So, I'm trying to do the same this you have in your response except I need to update the records.
In my case the gallery is actually irrelevant. I just grab an attribute from the selected item and concatenate it in front of the text box Text value. UpdateContext({varMessageText:Concatenate(Gallery1.Selected.Title,Textbox1.Text})

For simplicity, I want to:
ForAll(Listbox1.SelectedItems,Patch('[dbo].[Pages]',***This is where I don't know what to do***,{AlertHtml:varMessageText})))
Hope this helps
Ron

Was this reply helpful? Yes No
yashag2255 24,769 Super User 2024 Season 1 on at

Like (0)

Report
Hi,

If you want to update an existing record in the table, then the below formula will work:
ForAll(Listbox1.SelectedItems,Patch('[dbo].[Pages]',Lookup('[dbo].[Pages]', <<condition>>),{AlertHtml:varMessageText})))
Lookup fetchs the first record that satisfies the condition so make sure the condition is applied in a way that only the required record is retrieved.

Hope this helps!

Thanks,

If this reply has answered your question or solved your issue, please mark this question as answered. Answered questions helps users in the future who may have the same issue or question quickly find a resolution via search. If you liked my response, please consider giving it a thumbs up. THANKS!

Was this reply helpful? Yes No
Verified answer

v-yutliu-msft on at

Like (0)

Report
Hi @Capt_Ron ,
Do you want to modify several records at the same time?
I've made a similar test for your reference:
Set the listbox's OnChange:
ClearCollect(selecteditems,Filter('[dbo].[Pages]',ID in ListBox1.SelectedItems.ID))
Set the button's OnSelect:
ForAll(selecteditems,Patch('[dbo].[Pages]',LookUp('[dbo].[Pages]', ID = selecteditems[@ID]),{AlertHtml:varMessageText}))
Here's a doc about update multiple records for your reference:
https://powerapps.microsoft.com/en-us/blog/bulk-update-using-forall-and-patch/

Best regards,
Community Support Team _ Phoebe Liu

Was this reply helpful? Yes No
Capt_Ron 74 on at

Like (0)

Report
For closure, I wanted to post my final code (test code) that works.

This is on the Save Button:

ClearCollect(SelectedPages,ListBox1.SelectedItems); ForAll(SelectedPages,Patch('[dbo].[SSOPagesTest]',LookUp('[dbo].[SSOPagesTest]',pk_ID=SelectedPages[@pk_ID]),{HTMLAlert:Concatenate("Testing<|>",TextInput1.Text)})); Refresh('[dbo].[SSOPagesTest]')
The key is the SelectedPages[@pk_ID] piece.

@v-yutliu-msft Thank you very much.

Was this reply helpful? Yes No
Tony9 2 on at

Like (0)

Report

I have a very similar problem and i can't figure out how to get it work, any help is appreciated:

// mycollection: contains a table of unique hashvalues
// myds: is a sharepointlist, a table which has among others a column called 'Hashvalue' containing them.

i want to patch all myds entries which can be identified by the hashvalues therefore i tried lots of variations of:
ForAll(mycollection; Patch(myds; LookUp(myds; ThisRecord.field_0=Hashvalue); {'Status.': "Accepted"}));;

I keep running into the error:
"The data source provided to the function is invalid."

// Patching based on a gallery works but is not applicable for this case:
Patch(myds; 'Gallery'.Selected; {'Status': "Accepted"});;

Exemplary content of mycollection at runtime (valid values):

Was this reply helpful? Yes No