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Samit
Advocate I
Advocate I

Patch function is not inserting blank in dataverse unless experimental feature is ON

It seems the patch operation does not insert blank in dataverse without turning experimental feature on. If the value is blank then it simply ignores it. For e.g

 

I have following scenerio:-

  1. Two dataverse tables :-
    1. "Test Employee" table with two column:-
      1. Name->text type
      2. Indigenous status->lookup to status table
    2. "Status" table which has one column called type.
  2.  A canvas app screen has following :-
    1. A textbox to enter employee name, its value needs to be updated in to Name column in data verse.
    2. A drop down to select indiginous status of employee, which populated with data from status table.
    3. A checkbox which clear the textbox and dropdown.
    4. A save button which patch value to dataverse.

Following are the testing performed:-

 

  1. Open a existing record to update.
  2. Edit value in textbox to "emp1" and drop down to "Aborigional".
  3. On save data is getting updated successfully.
  4. Open record again to update.
  5. Empty the value of textbox and keep dropdown selected to "Aborigional"
  6. On save data is getting updated scuccessfully.
  7. Open record again to update.
  8. Unselect value from drop down so nothing selected.
  9. On Save the data of status does not updated to empty in data verse as well on the screen.
  10. Open record again to update.
  11. Edit value in textbox to "emp1" and you notice the drop down still selected to "Aborigional".
  12. Now select the "clear" checkbox to clear values of textbox and dropdown.
  13. On Save neither textbox blank value saved nor dropdown blank value saved.
  14. Open the record again to update and you still notice "emp1" in textbox and "Aborigional" selected in dropdown.
  15. Now file menu click settings->upcoming features->experimental->enable "formula-level error management"
  16. Close the app and reopen to get the new setting take affect.
  17. Open the record again to update and you still notice "emp1" in textbox and "Aborigional" selected in dropdown.
  18. Now select the "clear" checkbox to clear values of textbox and dropdown.
  19. On save blank value of bothe the data is getting updated successfully.

 

Is it possible to insert blank value in dataverse using patch without enabling experimental feature?

4 REPLIES 4
v-xiaochen-msft
Community Support
Community Support

Hi @Samit ,

 

If you clear the dropdown, it actually patched blank().

If you want patch blank(), you must turn on this setting.

 

For example:

 

If dropdown has no selected value,

Patch(LIST123,First(LIST123),{Test3:Dropdown1.Selected.Value}) = Patch(LIST123,First(LIST123),{Test3:Blank()})

// Test3 is a text column.

You need to turn on the setting for the formula to work.

v-xiaochen-msft_1-1621561594267.png

 

However, If you want to patch a null value for a text column, you could try patch "" instead of blank().

 

For example:

If(Dropdown1.Selected.Value=Blank(),
Patch(LIST123,First(LIST123),{Test3:""}),
Patch(LIST123,First(LIST123),{Test3:Dropdown1.Selected.Value}))

v-xiaochen-msft_2-1621561857001.png

 

It’s important to note that although they all seem to have no value, they are not exactly the same.

 

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.

 

 

Thanks for the reply.

 

Do you mean following experimental setting has to be turned ON in order to save blank value? and there is no other way to save blank value specialy when drop down value saved in lookup field in dataverse.
* formula-level error management

 

 

v-xiaochen-msft
Community Support
Community Support

Hi @Samit ,

 

Do you mean following experimental setting has to be turned ON in order to save blank value? 

Yes

 

Best Regards,
Wearsky
If my post helps, then please consider Accept it as the solution to help others. Thanks.

Thanks again for the reply.

 

The only concern is how safe it is to rely on experimental feature. As name suggest it is experimental, it can be removed anytime by Microsoft which eventualy breaks the production application.

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