Laravel 5.2 - 使用SetIdAttribute（）Mutator设置其他值

Question

I am currently creating a blog where each Post row in my database will have a unique hash attribute that is based of the post's id (incrementing, always unique).

This my Post model

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;
use Hashids;

class Post extends Model
{
  public function setTitleAttribute($value)
  {
    $this->attributes['title'] = $value;

    if (! $this->exists) {
      $this->attributes['slug'] = str_slug($value);
    }
  }

  public function setIdAttribute($value) {
    $this->attributes['id'] = $value;
    $this->attributes['hash'] = Hashids::encode($value);
  }
}

When I run this factory

$factory->define(App\Post::class, function (Faker\Generator $faker) {
    return [
        'title' => $faker->sentence(mt_rand(3, 10)),
        'content' => join("

", $faker->paragraphs(mt_rand(3, 6))),
        'author' => $faker->name,
        'category' => rand(1, 20),
    ];
});

The setIdAttribute($value) function is getting called, but my hash attribute is not being set. I am not sure if it is getting overwritten or what.

If I move the line

$this->attributes['hash'] = Hashids::encode($value);

to the function

public function setTitleAttribute($value)

and encode the title attribute it works fine, but I want to encode the 'id' attribute. Any idea how I would do this?

Answer 1

You can add the following to your model:

/**
 * Events
 */
public static function boot()
{
    parent::boot();

    static::created(function($model)
    {
        $model->hash = Hashids::encode($model->id);
        $model->slug = str_slug($model->title);
    }
}