Getting Error While using filament table as dashboard widget

[titusfrezer]

I used the above code to join 2 tables and output the array using the table in filament but got the below error.

Filament\Widgets\TableWidget::getTableRecordKey(): Return value must be of type string, null returned;

[titusfrezer]

Never mind, the issue was what I was trying to select from my db(just selecting a name from the table) so filament was claiming me for that. I added ID too when I selected it from the table and the error was gone.

[renoanthus]

public function getTableRecordKey(Model $record): string
{
return $record->uniqueColumn;
}

[ajayjoshioutdosolutions]

This worked for me
public function getTableRecordKey($record): string
{
return (string) $record->module_id;
}