Get all titles of a many_many component in a GridField summary
Assuming you have a DataObject with $many_many Tags, you can easily add all Tag's Titles comma seperated to $summary_fields using PHP's join method, even sorted by the SortOrder of the Tag DataObject, given it has $default_sort set properly:
private static $summary_fields = [
'Title' => 'Title',
'TagsForSummary' => 'Tags'
];
public function TagsForSummary() {
return join(', ', $this->Tags()->Column('Title'));
}
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