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mrQ
Responsive Resident
Responsive Resident

Patch a collection to SharePoint - specified column is read only

Dear community,

 

I would like to patch a collection (MyOptions)to a SharePoint list (Participants). MyOptions is a copy of Participants, with modified values. 

 

If I would like to patch MyOptions with Participants for the "first" time, it works perfectly and also reflects everything correctly in the SharePoint list. However, right after the first successful patch it will then throw an error The specified column is read-only and can't be modified. Until I re-modify my Patch function, it will keep showing that error, preventing me from patching again. 

 

This is the patch function I use:

 

Patch(
    Participants,
    colMyOptions
);

 

 

Anyone else experienced this before? I already tried re-adding the data source and restarting power apps studio.

 

Greetings,

 

 

1 ACCEPTED SOLUTION

Accepted Solutions
WarrenBelz
Most Valuable Professional
Most Valuable Professional

@mrQ ,

I have never tried a Patch and assumed that it would automatically work out what fields and records need to match in the source and destination (also bear in mind that if you do not have a unique identifier you could also get quite unexpected results). I have however used Collect for new records where fields and data types match from a collection, but had one fall over recently when the list reached 5,000 records (it simply did nothing) and had to revert to a Patch as noted.

We all have different opinions on this, but I have critical prod apps with a lot of data collection in the field and generally do things "the long way" if I am sure it will work every time.

 

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.

 

 

 

View solution in original post

5 REPLIES 5
WarrenBelz
Most Valuable Professional
Most Valuable Professional

Hi @mrQ ,

Normally, you would have to do something like (assuming you have ID in the collection)

ForAll(
   colMyOptions As aOptions,
   Patch(
      Participants,
      {ID:aOptions.ID},
      {
         Field1:aOptions.Field1,
         Field2:aOptions.Field2,
         Field3:aOptions.Field3,
         . . . and the rest . . .
      }
   )
)

for existing record updates

 

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.

 

Hi @WarrenBelz 

 

Thanks for your reply.

Yeah that is currently my workaround. Although, I really would like to keep it simple, if even possible.

I'm wondering why it always works for the first time I'm pressing the button, but then not anymore. Do you have an idea?

 

WarrenBelz
Most Valuable Professional
Most Valuable Professional

@mrQ ,

I have never tried a Patch and assumed that it would automatically work out what fields and records need to match in the source and destination (also bear in mind that if you do not have a unique identifier you could also get quite unexpected results). I have however used Collect for new records where fields and data types match from a collection, but had one fall over recently when the list reached 5,000 records (it simply did nothing) and had to revert to a Patch as noted.

We all have different opinions on this, but I have critical prod apps with a lot of data collection in the field and generally do things "the long way" if I am sure it will work every time.

 

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.

 

 

 

This is a huge problem! Why isn't there a way to drop all read-only columns?

How about this, Microsoft: if read-only columns always cause errors when patching data to SharePoint, wouldn't it be logical to always remove read-only columns from patch requests? Why should the user have to specify every single modifiable column with ShowColumns() or every single read-only column with DropColumns()????

Isn't it obvious that the patch request should automatically drop all non-modifiable columns? What would be the harm in that? Don't give me an error! Just patch my data and make it work.

This is such a major annoyance with developing canvas apps that talk to SharePoint, it just seems like the solution is glaringly obvious. Or how about this, TELL ME WHICH COLUMN IS READ-ONLY!!!!! The error message "Network error when using Patch function: The specified column is read-only and can't be modified." is frustratingly incomplete. Seriously, just tell me which columns I have to drop and I'll drop them. As it stands, I've gone down the entire list of auto-suggested columns and can't seem to find the remaining read-only columns. So, my next option would be to forget using DropColumns() and switch to ShowColumns() but that's an even worse solution because of how many columns are in this list. I should not have to explicitly specify every single modifiable column or every single read-only column in order to patch some data. This is ridiculous!

I'm facing to the same issue today, you're absolutely right @HEATFreight . The read-only columns are all the columns that we don't care about such like "Modified", "Modified by","Version". The solution of @WarrenBelz is always the only way to achieve this.

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