Order by relationship column - laravel

Question

I have the following query:
$items = UserItems::with('item')
->where('user_id','=',$this->id)
->where('quantity','>',0)
->get();
I need to order it by item.type so I tried:
$items = UserItems::with('item')
->where('user_id','=',$this->id)
->where('quantity','>',0)
->orderBy('item.type')
->get();
but I get Unknown column 'item.type' in 'order clause'
What I am missing?

Answer 1

join() worked fine thanks to #rypskar comment
$items = UserItems
::where('user_id','=',$this->id)
->where('quantity','>',0)
->join('items', 'items.id', '=', 'user_items.item_id')
->orderBy('items.type')
->select('user_items.*') //see PS:
->get();
PS: To avoid the id attribute (or any shared name attribute between the two tables) to overlap and resulting in the wrong value, you should specify the select limit with select('user_items.*').

Answer 2

Well, your eager loading is probably not building the query you're expecting, and you can check it by enabling the query log.
But I would probably just use a collection filter:
$items = UserItems::where('user_id','=',$this->id)
->where('quantity','>',0)
->get()
->sortBy(function($useritem, $key) {
return $useritem->item->type;
});

Answer 3

You can use withAggregate function to solve your problem
UserItems::withAggregate('item','type')
->where('user_id','=',$this->id)
->where('quantity','>',0)
->orderBy('item_type')
->get();

Answer 4

I know it's an old question, but you can still use an
"orderByRaw" without a join.
$items = UserItems
::where('user_id','=',$this->id)
->where('quantity','>',0)
->orderByRaw('(SELECT type FROM items WHERE items.id = user_items.item_id)')
->get();

Answer 5

For a one to many relationship, there is an easier way. Let's say an order has many payments and we want to sort orders by the latest payment date. Payments table has a field called order_id which is FK.
We can write it like below
$orders = Order->orderByDesc(Payment::select('payments.date')->whereColumn('payments.order_id', 'orders.id')->latest()->take(1))->get()
SQL Equivalent of this code:
select * from orders order by (
select date
from payments
where order_id = payments.id
order by date desc
limit 1
) desc
You can adapt it according to your example. If I understood right, order's equivalent is user and payment's equivalent is item in your situation.
Further reading
https://reinink.ca/articles/ordering-database-queries-by-relationship-columns-in-laravel

Answer 6

I found another way of sorting a dataset using a field from a related model, you can get a function in the model that gets a unique relation to the related table(ex: table room related to room category, and the room is related to a category by category id, you can have a function like 'room_category' which returns the related category based on the category id of the Room Model) and after that the code will be the following:
Room::with('room_category')->all()->sortBy('room_category.name',SORT_REGULAR,false);
This will get you the rooms sorted by category name
I did this on a project where i had a DataTable with Server side processing and i had a case where it was required to sort by a field of a related entity, i did it like this and it works. More easier, more proper to MVC standards.
In your case it will be in a similar fashion:
User::with('item')->where('quantity','>',0)->get()->sortBy('item.type',SORT_REGULAR,false);

Answer 7

$users
->whereRole($role)
->join('address', 'users.id', '=', 'address.user_id')
->orderByRaw("address.email $sortType")
->select('users.*')

Answer 8

you can simply do it by
UserItems::with('item')
->where('user_id','=',$this->id)
->where('quantity','>',0)
->orderBy(
Item::select('type')
->whereColumn('items.useritem_id','useritems.id')
->take(1),'desc'
)
->get();