Sonata admin export fields with collection fields - symfony

Question

I'm trying to make custom columns for export, but I can't access children. Is there any possibility to do that ?
My code at this moment looks like this:
public function getExportFields()
{
return [
'ID' => 'id',
'Transaction number' => 'transactionNumber',
'Loan account' => 'loan',
'Loan name' => 'loan.name',
'Amount' => 'amount',
//'Amount ($)' => '',
'Transaction type' => 'transactionCategory',
'Reference' => 'transactionAssociation.cashTransaction.transactionNumber',
'Date' => 'date'
];
}
I can't find out a solution. I was thinking to use PropertyAccess, but I don't know how to integrate it here.
I'm using Symfony 3.X with Sonata.

Answer 1

To get the collection records in export you cannot directly do this by specifying the property with association, A workaround for to achieve this you can define a new unmapped property in your entity with a getter function which will get all the collection details like in your main entity define new property as
protected $cashTransactionNumber;
public function getCashTransactionNumber()
{
$cashTransactionNumber = array();
$i = 1;
foreach ($this->getTransactionAssociation() as $key => $transactionAssociation) {
$cashTransactionNumber [] = $i .
') No.:' . $transactionAssociation->somemethod()->__toString()() .
/** Other properties */;
$i++;
}
return $this->cashTransactionNumber = join(' , ', $cashTransactionNumber );
}
then in your getExportFields() method call this property
public function getExportFields(){
return array(
'Reference'=>'cashTransactionNumber ',
....// Other properties
);
}
Reference: Exporting one to many relationship on sonata admin