[jira] [Commented] (NIFI-4306) UpdateRecord does not allow user to set root path to some child record

["ASF GitHub Bot (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/NIFI-4306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158748#comment-16158748 ] 

ASF GitHub Bot commented on NIFI-4306:
--------------------------------------

Github user markap14 commented on the issue:

    https://github.com/apache/nifi/pull/2103
  
    @pvillard31 yeah at this point, the properties are given to use in a Map and not in any guaranteed order. So the updates are applied in some arbitrary order. If you have conflicting "rules" then there's no real way to determine what order they will be evaluated in. So if the first rule ( / => /accounts[1]/* ) is evaluated first then /name will evaluate to `null`. Otherwise, the /name will be updated and then the other rule will overwrite it...


> UpdateRecord does not allow user to set root path to some child record
> ----------------------------------------------------------------------
>
>                 Key: NIFI-4306
>                 URL: https://issues.apache.org/jira/browse/NIFI-4306
>             Project: Apache NiFi
>          Issue Type: Bug
>          Components: Extensions
>            Reporter: Mark Payne
>            Assignee: Mark Payne
>             Fix For: 1.4.0
>
>
> If i have the following record:
> {code}
> {
>   "queue": {
>      "count": 1,
>      "size": "1 MB"
>   }
> }
> {code}
> And I want to get rid of the 'queue' element I should be able to do so by using UpdateRecord with a property name of "/" and a value of "/queue/*"
> Currently, if I try this, though, I get an error indicating that more than 1 element has been selected. We should instead just create a 'record' object with both the 'count' and 'size' fields and set that as the root so that the result is:
> {code}
> {
>   "count": 1,
>   "size": "1 MB"
> }
> {code}



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