用背包存放额外的枢轴表字段

Question

In laravel\backpack (https://backpackforlaravel.com/)! I'm trying to create store customer data with users attached. To do this I figured I'd use a many 2 many relationship with a pivot table.

Since i will needs more pivots, i thought it be clever to have a table that stores pivot data like customer_id model_type moderl_id

In other words a polymorphic pivot table.

This solution didn't quite work: BACKPACK Laravel manage extra columns in pivot table in a many-to-many relationship using Backpack CRUD

I also trying to link this to a field like this:

[
  'name'                  => 'users',
  'type'                  => 'select2_from_ajax_multiple_pivot',
  'label'                 => "Overige Contactpersonen",
  'entity'                => 'users',
  'attribute'             => 'fullname',
  'box'                   => 'Contactpersonen',
  'data_source'           => url('api/customers'),
  'placeholder'           => 'Koper',
  'pivotFieldsLabel' => ['Spekkies'],
  'pivot' => true,
  'pivotFields' => [
      'model_type' => 'user'
   ],
   'model'                 => BackpackUser::class,
   'minimum_input_length'  => 2,
],

So far it only results in a pivot table where the customer_id and the model_id are stored.