associate laravel

1When updating a belongsTo relationship, you may use the associate method. This 
2method will set the foreign key on the child model:
3
4	$account = App\Account::find(10);
5	$user->account()->associate($account);
6	$user->save();
7
8When removing a belongsTo relationship, you may use the dissociate method. This
9method will set the relationship foreign key to null:
10
11	$user->account()->dissociate();
12	$user->save();

1//id for single
2$user->reasons->attach($reasonId);
3
4//array for multiple
5$user->reasons->attach($reasonIds);
6
7$user->save();

1<?php
2
3namespace App\Models;
4
5use Illuminate\Database\Eloquent\Model;
6
7class Project extends Model
8{
9    /**
10     * Get all of the deployments for the project.
11     */
12    public function deployments()
13    {
14        return $this->hasManyThrough(Deployment::class, Environment::class);
15    }
16}