Populating repeating grid with database service response

Hi,

 

Using Orbeon PE version 2018.2

 

We're trying to populate a repeating grid from a database service response. We have seen a few examples of how this can be done. This seemed like the most promising one, however it did not work: <a href="https://gist.github.com/avernet/dc3bcaefd1c1fd7df9022834a83767c4" target="_blank" rel="nofollow" onmousedown="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgist.github.com%2Favernet%2Fdc3bcaefd1c1fd7df9022834a83767c4\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNEfqSHI5aVQxUOdrJIXEu19Xur4dw&#39;;return true;" onclick="this.href=&#39;https://www.google.com/url?q\x3dhttps%3A%2F%2Fgist.github.com%2Favernet%2Fdc3bcaefd1c1fd7df9022834a83767c4\x26sa\x3dD\x26sntz\x3d1\x26usg\x3dAFQjCNEfqSHI5aVQxUOdrJIXEu19Xur4dw&#39;;return true;">https://gist.github.com/avernet/dc3bcaefd1c1fd7df9022834a83767c4

 

We are storing the response of the db call in a dataset. I know the dataset is populating because I am putting a count(fr:dataset('my-test-dataset')//poitemdesc) value in a text field and I see the number updating. However the repeating grid just stays with 1 empty item, as if nothing happened.

 

<raw>
<xf:action iterate="fr:dataset('my-test-dataset')//poitemdesc">
    <xf:insert context="xxf:instance('fr-form-instance')/section-1/polines-grid" ref="polines-grid-iteration"
 origin="xxf:element(
            'polines-grid-iteration',
               (
                  xxf:element('po-description', '')
               )
            )"
   />
</xf:action>
</raw>

 

Any ideas?