As the error says, you're trying to get a relationship on a collection, the relationship exists on the objects (records) in that collection. You need to loop over the Users, and for each one get their items...

$users = User::all();

// Blade template
@foreach ($users as $user)
  // access user properties here
  @foreach ($user->item as $item)
    // access item properties here.
  @endforeach
@endforeach

Dear AndrewBNZ thank you for your repay

my problem is not with loop becouse

this is work

     return  User::all();

this is not work

      return  User::all()->item;

Yes, it is your problem. You can't access the relationship like that - all() gives you back a collection, a list, a bucket of records - relationships need to be retrieved on each individual record, not the collection.

AndrewBNZ is right, all() will return a collection but since you used hasMany under User class in Item, you really need to loop it to be able to retrieve the record.