Laravel 5.通过foreach中的多个表和行为的雄辩关系

Question

I have the following Models:

Shop_list:

public function shopListItem()
{
    return $this->hasMany(Shopping_list_item::class, 'shopping_list_id');
}

Shopping_list_item:

public function shoppingList()
{
    return $this->belongsTo(Product::class);
}

public function product()
{
    return $this->belongsTo(Product::class);
}

Product:

public function shopListItem()
{
    return $this->hasMany(Shopping_list_item::class);
}

When I execute this code:

{{$shoppinglists->shopListItem()->first()}}

I get the following correct result:

  {"id":1,"shopping_list_id":13,"product_id":69,"quantity":4,"created_at":"2016-09-05 19:23:35","updated_at":"2016-09-05 19:34:53"}

But if I want to loop and get id:

@foreach($shoppinglists as $sh)
{{$sh->shopListItem()->id}}
@endforeach

Then I get the following error:

Call to a member function shopListItem() on boolean

Question: Why in the loop the object is transformed to a boolean? What is the correct way to loop?

Answer 1

When you want to access the attributes of the related model, you need to use the object, not the function. Note the lack of parenthesis.

{{$sh->shopListItem->id}}

Since it's a hasMany relationship, shopListItem would be an array that you'll need to iterate through:

@foreach($sh->shopListItem AS $item)
{{ $item->id }} 
@endforeach