class BelongsToManyRelationship (View source)
| protected Factory | $factory | The related factory instance. | |
| protected callable|array | $pivot | The pivot attributes / attribute resolver. | |
| protected string | $relationship | The relationship name. | 
| void | __construct(Factory $factory, callable|array $pivot, string $relationship) Create a new attached relationship definition. | |
| void | createFor(Model $model) Create the attached relationship for the given model. | 
Create a new attached relationship definition.
Create the attached relationship for the given model.
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    https://laravel.com/api/8.x/Illuminate/Database/Eloquent/Factories/BelongsToManyRelationship.html