Bitrix ORM getList how to use data_doubling?

Question

1C-Bitrix

I have described an entity; it has a reference field PROFESSION.
I do getList with parameters:

$arFields   =   [
    'filter'        =>  ['!PROFESSION.ID'=>false],
    'select'        =>  ['NAME','ID'],
    'data_doubling' =>  false
];
$res    =   BranchTable::getList($arFields);

At the output, I get an array of records from BranchTable but with a bunch of duplicates.
How to use data_doubling correctly?

Answer 1

for data_doubling = false to work, there must be an indication of the relationship in the description of the entity, in your case apparently OneToMany
Example

new \Bitrix\Main\ORM\Fields\Relations\OneToMany('PROFESSION', \Bitrix\Iblock\SectionTable::class, 'IBLOCK_SECTION')

Request example

$result = \Bitrix\Iblock\SectionTable::getList([
  'filter' => ['IBLOCK_ID' => 2, '!PROFESSION.ID' => false],
  'select' => ['NAME'],
  'data_doubling' => false
])->fetchAll();

Then the specified fields in the select, in the NAME example it is of the PROFESSION.NAME type, something like this