Import - how to get data from previous row

[thelasth]

Hello

I'm using this package to import excel file to database

In my excel file I have a column name "Ref" and an other name "toRef" In my database I have a field "toRef_id"
When I import a file I want to save in toRef_id, the id create where the row with Ref was equal to toRef For example

First row : Ref = First, Name = My first data, toRef = null
Second row : Ref = Second, Name = second data, toRef = null
Third row : Ref = Third, Name = My third data, toRef = First

So I want to import the first row to database with toRef_id = null. For example the id created is 1
And when I import the second row I want to save in database the toRef_id = 1

There is my controller :

function import(){ (new CustomImport)->import('myfile') }
and CustomImport

class CustomImport implements ToModel, WithHeadingRow{ use Importable; public function model(array $row){ Data::create([ 'name' => $row['name'], ]) } }
But I don't know how to get the id of a previous created row where $previousrow['ref'] = $row['toRef']

Could you help me please ?