Sub-columns for multiItemLink columns

As you may already know if you have a column with a multiItemLink type it is not possible to have sub-columns using dot notation (binding=item.severity)

In this article, we are going to show you how to create sub-columns for the multiItemLink columns using the "serverRender" functionality.

- Sub-column for multiItemLink column (upstream)

Imagine there is an upstream traceability column that shows the multiple System Requirement WIs linked to the Risk item.

Every System Requirement has a Severity property, that you'd like to show in an additional sub-column "Severity".

You can achieve this with the help of the "serverRender" property. 

• Create a "Severity" column as usual, except do NOT add there a "binding" parameter;
• Instead, add there the following "serverRender" snippet, considering that "systemrequirement" is an ID of WI type:

"serverRender": "<ol style='margin-block-start: -16px;margin-block-end: -16px;padding-inline-start: 16px;'>#foreach($linkedWorkItem in $item.fields().linkedWorkItems()) #set($sysReq = $linkedWorkItem.fields().workItem().get()) #set($typeId = $sysReq.fields().type().get().id()) #if($typeId.equals(\"systemrequirement\")) <li> $sysReq.fields().severity().render().withIcon(true).htmlFor().forFrame() </li>  #end #end</ol>" 

In case you want the "Severity" value to be rendered in one column together with the Item Link, check the following article: Customize the way Item Links are rendered 

- Sub-column for multiItemLink column (backlink)

Additionally, the same approach could be used for the downstream traceability items.

If you would like to have a multiItemLink downstream column "issue" shown in a separate column check the following article, "Back Links" section:  Configure Up-stream Traceability Column

For this use case to display the "Severity" sub-column, we'll need to search for all Work Items of type "Issue" and before rendering the Severity value, sort the Work Items by their ID:

 "serverRender": "<ol style='margin-block-start: -16px;margin-block-end: -16px;padding-inline-start: 16px;'>#foreach($issueWi in $item.transaction().workItems().search().query(\"type:issue AND linkedWorkItems:${item.getReference().projectId()}/${item.getReference().id()}\").sort(\"id\")) <li> $issueWi.fields().severity().render().withIcon(true).htmlFor().forFrame() </li>   #end</ol>" 

The rest of adding a new column procedure is the same as it was before.

As a result, you'll get a list of Issue WIs sorted by their ID and the Severity column with the related values.

If you don't know how to configure an up-stream column to show multiple linked Work Items, please check the following link: click here

If anything is unclear or you have other questions feel free to contact us at support@nextedy.com