Laravel - Four levels deep relationship - php

Question

I am trying to map a relationship between the User and Order Model within Order Model.
An order has one project. The project has one team and the team has one owner/user
The relationship is four levels deep like following:
order > project > team > user
My database tables are as follows:
App\Order
id,
project_id
App\Project
id,
name,
team_id
App\Team
id
name
user_id
App\User
id
name
My Order Model:
class Order extends Model{
function customer(){
// trying to map the relationship here
}
}
I would like to access the customer like following:
$order = Order::find(1);
echo $order->customer->name;
Could you please tell me how to map the above-mentioned relationship?

Answer 1

You can get it by including joins in your query like:
$data = Order::select('orders.*')
->join('projects', 'orders.project_id', '=', 'products.id')
->join('teams', 'projects.projects_id', '=', 'teams.id')
->join('users', 'teams.teams_id', '=', 'users.id')
->get();
For Eloquent you can use this package.
You can define deeper relationships :
Order → belongsTo → Project → belongsTo → Team → belongsTo → User :
class Order extends Model
{
use \Znck\Eloquent\Traits\BelongsToThrough;
public function customer()
{
return $this->belongsToThrough('App\User', ['App\Team', 'App\Project']);
}
}

Answer 2

Another way would be to define a belongsTo in your model by adding joins to directly reach users table
class Order extends Model
{
public function customer()
{
return $this->belongsTo(Project::class, 'project_id')
->join('team as t', 't.id', '=', 'projects.team_id')
->join('users as u', 'u.id', '=', 't.user_id')
->select(['u.id as uid','u.name','projects.id']);
}
}
And then you can directly get the customer information from order object
$order = Order::find(1);
$order->customer->name;
OR
Via eager loding
$orders = Order::with('customer')->get();