[Dynamic Form] It will throw "a 'PrimitiveValue' or 'StartObject' node was expected" error when clean up a multiple lookup field

[wuxiaojun514]

Category

[ ] Enhancement

[x] Bug

[ ] Question

Version

Please specify what version of the library you are using: [ 3.20 ]

Expected / Desired Behavior / Question

Observed Behavior

It will throw error when you clean up a LookupMulti field and save it in Dynamic Form.

Error making HttpClient request in queryable [400] ::> {"odata.error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"An unexpected 'PrimitiveValue' node was found when reading from the JSON reader. A 'StartArray' node was expected."}}}

I think we should use [] instead of null when save it in rest api

Steps to Reproduce

1. Make sure your list has a multiple lookup field and create an item which has value on this multiple lookup field.
2. Create a form customization spfx solution with Dynamic Form control
3. Edit the item with Dynamic Form and delete the value on multiple lookup field
4. Click save button in the form, then you will get the exception.

This problem is similar as #1578 .
It should work if we change the null to [] . I can find sometime to fix it.

[michaelmaillot]

Hello @wuxiaojun514,

I confirm the bug, it's all yours!

[wuxiaojun514]

Got it, I will create a pull request tomorrow

[wuxiaojun514]

Hi @michaelmaillot ,

I have raised the PR to fix it, please take a look.

[michaelmaillot]

Linked PR has been merged and should be available in next beta release.

Thanks for your contribution!