Eloquent Boot Sequence

01.EloquentBootSequence.README.md

Eloquent Boot Sequeence

Demonstrates Laravel's eloquent model boot sequence, including object construction. #

Order of code executed:

• Static boot method

public static boot(){...}

• Trait boot methods

public bootFooTrait(){...}

• Constructor

public function __construct(){...}

Order of model events

• Saving
• Creating (or Updating)
• Created ( or Updated)
• Saved

app\History.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class History extends Model
{
    /**
     * The attributes that are not mass assignable.
     *
     * @var array
     */
    protected $guarded = [];
}

app\LoggingTrait.php

<?php

namespace App;

use Illuminate\Support\Facades\Log;

trait LoggingTrait
{
    /**
     * Boot the logging for the model.
     *
     * @return void
     */
    public static function bootLoggingTrait()
    {
        Log::info('booting traits');
        static::log('booting traits');
    }
}

app\Post.php

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Post extends Model
{
    use LoggingTrait;

    /**
     * The attributes that are not mass assignable.
     *
     * @var array
     */
    protected $guarded = [];

    public static function boot()
    {
        self::log('booting');
        parent::boot();

        static::saving(function ($model) {
            $model->log('saving');
        });
        static::creating(function ($model) {
            $model->log('creating');
        });
        static::created(function ($model) {
            $model->log('created');
        });
        static::updating(function ($model) {
            $model->log('updating');
        });
        static::updated(function ($model) {
            $model->log('updated');
        });
        static::saved(function ($model) {
            $model->log('saved');
        });
    }

    public function __construct(array $attributes = [])
    {
        parent::__construct($attributes);
        self::log('constructing');
    }

    public static function log($event)
    {
        $row = History::get()->last();
        $log = json($event, $row->log);
        $row->update(['log' => $log]);
    }

}

database\migrations\2016_11_03_204859_create_posts_table.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreatePostsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('posts', function (Blueprint $table) {
            $table->increments('id');
            $table->text('body')->nullable();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('posts');
    }
}

database\migrations\2016_11_03_204913_create_history_table.php

<?php

use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;

class CreateHistoryTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('histories', function (Blueprint $table) {
            $table->increments('id');
            $table->text('log')->nullable();
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('histories');
    }
}

routes\web.php

Route::get('/new', function () {
    History::create([]);
    new Post();
    return History::get()->last()->log;
});
Route::get('/new-instantiate', function () {
    History::create([]);
    $post = new Post(['body' => 'new-instantiate']);
    $post->save();
    return History::get()->last()->log;
});
Route::get('/create', function () {
    History::create([]);
    Post::create(['body' => 'create']);
    return History::get()->last()->log;
});
Route::get('/create-and-update', function () {
    History::create([]);
    Post::create(['body' => 'create']);
    Post::get()->last()->update(['body' => 'create-and-update' . time()]);
    return History::get()->last()->log;
});
Route::get('/get-and-update', function () {
    History::create([]);
    Post::get()->last()->update(['body' => 'get-and-update' . time()]);
    return History::get()->last()->log;
});
Route::get('/update', function () {
    $post = Post::get()->last();
    History::create([]);
    $post->update(['body' => 'updated-' . time()]);
    return History::get()->last()->log;
});
Route::get('/get', function () {
    History::create([]);
    Post::find(1);
    return History::get()->last()->log;
});