Eloquent

Eloquent is an object-relational mapper (ORM) supported by default in Laravel framework to make it enjoyable when interacting with your database. For more info, you may like to read Eloquent ORM first.

Migrations

Migrations, like version control for your database, allow your team to define and share the application's database schema definitions. With database migrations, you no longer have to tell teammates to manually update required changes in their local database schema after pulling certain commits from source control.

Migrations classes are under src/Database/Migrations directory.

packages/metafox/blog/src/: Package source root
  Database/
    Migrations/
      2021_02_04_034457_CreateBlogTables.php  : Migrations for blog schema
      2021_02_05_034457_CreateCategoryTables.php  : Migrations for category schema

Each Migrations class is child of Illuminate\Database\Migrations\Migration class, and contains 2 up and down methods. Let's see the Migration CreateBlogTables class below

<?php

use MetaFox\Platform\Support\DbTableHelper;
use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateBlogTables extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        if (!Schema::hasTable('blogs')) {
            Schema::create('blogs', function (Blueprint $table) {
                $table->bigIncrements('id');

                // other columns
            });
        }

        // setup other table
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        DbTableHelper::dropStreamTables('blog');
    }
}

MetaFox platform is shipped with DbTableHelper, to support creating platform schemas easily and quickly.

For more info, please read Laravel migrations

Seeders

Each package includes the ability to seed your database with default data using Seeder classes. All package Seeder classes are stored in the src/Database/Seeders directory. By default, a DatabaseSeeder class is defined for you. With this class, you may use the call method to run other Seeder classes. It will allow you to control the seeding order.

<?php

namespace MetaFox\Blog\Database\Seeders;
use Illuminate\Database\Seeder;

class PackageSeeder extends Seeder {

  public function run()
  {
    // seed data to database
  }
}

Factories

Please read Define Laravel Model Factories

Observers

If your app is listening for many events on a given Model, you may use Observer to group all of your listeners into a single class. Observer classes have method names reflecting on the Eloquent events you wish to listen to. Each of these methods receives the affected Model as their only one argument.

<?php
// file name packages/metafox/blog/src/Observers/BlogObserver.php
namespace MetaFox\Blog\Observers;

use Exception;
use MetaFox\Blog\Models\Blog;

/**
 * Class BlogObserver.
 */
class BlogObserver
{

    /**
     * Invoked when a model is creating
     *
     * @param  Model  $model
     */
    public function creating(Model $model)
    {

    }

    /**
     * Invoked when a model created
     *
     * @param  Model  $model
     */
    public function created(Model $model)
    {

    }

    /**
     * Invoked when a model is updating
     *
     * @param  Model  $model
     */
    public function updating(Model $model)
    {

    }

    /**
     *Invoked when a model is updated
     *
     * @param  Model  $model
     */
    public function updated(Model $model)
    {

    }

    /**
     * Invoked when a model is deleting
     *
     * @param  Model  $model
     */
    public function deleting(Model $model)
    {

    }

    /**
     * Invoked when a model deleted
     *
     * @param  Model  $model
     */
    public function deleted(Model $model): void
    {

    }
}

For performance optimization, MetaFox does not support automatically discovering Observers, you must register Observers within the package ServiceProvider class. Below is the sample BlogServiceProvider class

<?php

namespace MetaFox\Blog\Providers;

use MetaFox\Platform\Support\EloquentModelObserver;
use Illuminate\Support\ServiceProvider;
use MetaFox\Blog\Models\Blog;
use MetaFox\Blog\Observers\BlogObserver;

class BlogServiceProvider extends ServiceProvider
{

    /**
     * Boot the application events.
     *
     * @return void
     */
    public function boot()
    {
        Blog::observe([EloquentModelObserver::class, BlogObserver::class]);
    }
}

For more info about Observers, please visit Laravel Model Observers

For Events list, please read Appendix - Event list

Repository

The main idea to use Repository Pattern in a Laravel is to create a bridge between models and controllers.