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<p>Hi Andreas,</p>
<p>in case of a relation 1:many you can use the <i>relation_aggregate</i>
function, something like:</p>
<p><i> relation_aggregate('test_n_318_fk_test1_7993_id','concatenate',</i><i>
to_string(@id),',')</i><br>
</p>
<div class="moz-cite-prefix">where the first parameter is the ID of
the relation.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Hope this helps...</div>
<div class="moz-cite-prefix">Stefan</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Am 29.11.2022 um 15:05 schrieb Andreas
Neumann via QGIS-Developer:<br>
</div>
<blockquote type="cite"
cite="mid:fc3e9bf5223e4b66cb5eb6eb4c8aa990@carto.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>Hi,</p>
<p>I am looking for a way to find out the internal id of a related
layer with a QGIS expression.</p>
<p>@id and $id only work directly on the feature of the source
layer, but not on related layers.</p>
<p>attributes(<br>
get_feature(<br>
'Other Related Layer',<br>
't_id',<br>
fkey_value<br>
)<br>
)</p>
<p>doesn't contain the internal id of the other layer ...</p>
<p>Any ideas how to get access to internal ids of other layers?</p>
<p>Thank you and greetings,</p>
<p>Andreas</p>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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