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mjolen
Regular Visitor

Update a Collection within a Gallery

We have a collection that we are using to populate a gallery.  There is a textbox inside the gallery that populates with that rows "rule number".  We want to allow the user to type in a new number that will update the collection which will also update the gallery.  In my below example, if you change 5 to 2, then 2 would become 3, 3 would become 4, and 4 would become 5.  Each row has a distinct key associated with it.  Seems to me that we should be able to filter the collection for the affected items in the collection and patch them back to the collection.  Running into problems with the syntax.  Looking to see if anyone has a suggestion or can recommend a video.

mjolen_1-1680127861812.png

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
WarrenBelz
Most Valuable Professional
Most Valuable Professional

Hi @mjolen ,

An example using a Text input for the number in the gallery and OnChange of this control: -

With(
   {
      wOld: ThisItem.RuleNumber,
      wNew: Value(Self.Text)
   },
   Patch(
      YourCollection,
      ThisItem,
      {RuleNumber: 0}
   );
   If(
      wOld > wNew,
      ForAll(
         Filter(
            Sort(
               YourCollection,
               RuleNumber,
               SortOrder.Descending
            ),
            RuleNumber >= wNew && RuleNumber < wOld
         ) As aCol,
         Patch(
            YourCollection,
            LookUp(
               YourCollection,
               RuleNumber = aCol.RuleNumber
            ),
            {RuleNumber: aCol.RuleNumber + 1}
         )
      ),
      wNew > wOld,
      ForAll(
         Filter(
            Sort(
               YourCollection,
               RuleNumber
            ),
            RuleNumber <= wNew && RuleNumber > wOld
         ) As aCol,
         Patch(
            YourCollection,
            LookUp(
               YourCollection,
               RuleNumber = aCol.RuleNumber
            ),
            {RuleNumber: aCol.RuleNumber - 1}
         )
      )
   );
   Patch(
      YourCollection,
      LookUp(
         YourCollection,
         RuleNumber = 0
      ),
      {RuleNumber: wNew}
   )
)

To summarise: -

 

  • Grab the old and new numbers as Variables
  • Shift the current item "out of the way" by allocating zero as a number
  • Depending on whether the item is moved up or down, add or subtract 1 from the items "in the middle"
  • Put the current item into its "new spot"

Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

MVP (Business Applications)   Visit my blog Practical Power Apps

View solution in original post

4 REPLIES 4
rswain
Resolver I
Resolver I

You can achieve this by using the Patch function to update the collection with the new value entered by the user. Here's an example of how you could implement this:

In the OnSelect property of the Save button, add the following code:

Patch(
    YourCollectionName,
    LookUp(
        YourCollectionName,
        KeyColumnName = ThisItem.KeyColumnName
    ),
    { RuleNumberColumnName: TextInput1.Text }
);
Replace YourCollectionName with the name of your collection, KeyColumnName with the name of the column that contains the unique key for each row, and RuleNumberColumnName with the name of the column that contains the rule number.

In the Items property of the gallery, add the following code:

Sort(
    YourCollectionName,
    KeyColumnName,
    Ascending
)
This will sort the collection by the key column in ascending order.

In the Text property of the TextBox that displays the rule number, add the following code:

ThisItem.RuleNumberColumnName

This will display the rule number for the current row.

When the user types in a new number and clicks the Save button, the Patch function will update the collection with the new value. The Sort function will then sort the collection by the key column, which will update the order of the rows in the gallery. Finally, the Text property of the TextBox will display the updated rule number for the current row.

Hi @rswain ,  Thanks for the quick reply.  The code you provided absolutely works for inserting the updated row into the collection and it sorts them.  The additional problem I am having is related to the image I shared in my original post.

 

If I change rule 5 to rule 2, then rule 2 should become rule 3 and rule 3 should become rule 4.

 

With the code you shared rule 5 is changed to 2 and rule 2 stays as rule 2.  Let me know if I need to further explain.  I appreciate any further information you can share.

WarrenBelz
Most Valuable Professional
Most Valuable Professional

Hi @mjolen ,

An example using a Text input for the number in the gallery and OnChange of this control: -

With(
   {
      wOld: ThisItem.RuleNumber,
      wNew: Value(Self.Text)
   },
   Patch(
      YourCollection,
      ThisItem,
      {RuleNumber: 0}
   );
   If(
      wOld > wNew,
      ForAll(
         Filter(
            Sort(
               YourCollection,
               RuleNumber,
               SortOrder.Descending
            ),
            RuleNumber >= wNew && RuleNumber < wOld
         ) As aCol,
         Patch(
            YourCollection,
            LookUp(
               YourCollection,
               RuleNumber = aCol.RuleNumber
            ),
            {RuleNumber: aCol.RuleNumber + 1}
         )
      ),
      wNew > wOld,
      ForAll(
         Filter(
            Sort(
               YourCollection,
               RuleNumber
            ),
            RuleNumber <= wNew && RuleNumber > wOld
         ) As aCol,
         Patch(
            YourCollection,
            LookUp(
               YourCollection,
               RuleNumber = aCol.RuleNumber
            ),
            {RuleNumber: aCol.RuleNumber - 1}
         )
      )
   );
   Patch(
      YourCollection,
      LookUp(
         YourCollection,
         RuleNumber = 0
      ),
      {RuleNumber: wNew}
   )
)

To summarise: -

 

  • Grab the old and new numbers as Variables
  • Shift the current item "out of the way" by allocating zero as a number
  • Depending on whether the item is moved up or down, add or subtract 1 from the items "in the middle"
  • Put the current item into its "new spot"

Please click Accept as solution if my post helped you solve your issue. This will help others find it more readily. It also closes the item. If the content was useful in other ways, please consider giving it Thumbs Up.

MVP (Business Applications)   Visit my blog Practical Power Apps

@WarrenBelz You are a rock star!  This is exactly what I was looking for and solved my problem.  Needed to modify it specifically for my solution but this is perfect. Thank you!

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