Laravel default user_id attribute in Model

Question

I have a model

class Foo extends Model
{
    protected $fillable = [
        'name',
        'user_id'
    ];

}

I would like to set Auth::user()->id by default to user_id column. So I added:

class Foo extends Model
{
    protected $fillable = [
        'name',
        'user_id'
    ];

    public function setUserIdAttribute()
    {
        $this->attributes['user_id'] = Auth::user()->id;

    }
}

And from my controller I'm calling for Foo::create($data) without user_id key. But it doesn't work as expected. store() gives Integrity constraint violation because of user_id is missing. (User already logged in to achieve create page)

Oleksii Boiko · Accepted Answer · 2016-07-11 07:44:35Z

You provide an example where you used accessors.

https://laravel.com/docs/5.1/eloquent-mutators#accessors-and-mutators

From official doc:

The accessor will automatically be called by Eloquent when attempting to retrieve the value of first_name:

If you want to set default value for some attributes you need to use Observers.

<?php
// file app/models/Foo.php
namespace App\Models;

use App\Observers\FooObserver;

class Foo extends Model
{
    protected $fillable = [
        'name',
        'user_id'
    ];

    public static function boot() {
        parent::boot();
        parent::observe(new FooObserver);
    }
}

<?php
// file app/observers/FooObserver.php
namespace App\Observers;

use App\Models\Foo;

class FooObserver {

    public function creating(Foo $model) {
        $this->user_id = Auth::user()->id;
    }
}

About model observers in official doc: https://laravel.com/docs/5.0/eloquent#model-observers

K M Rifat ul alom · Accepted Answer · 2018-06-27 08:06:04Z

5

i cannot find official documentation about model-observers for Laravel 5.6. but you can still do it by this code

public static  function boot()
{
    parent::boot(); // TODO: Change the autogenerated stub
    // it will automatically add authenticate user to created_by column of selected model 
    static::creating(function ($model){
        $model->created_by = auth()->user()->id;
    });
}

answered Jun 27, 2018 at 8:06

K M Rifat ul alom

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