calebporzio / parental
A simple eloquent trait that allows relationships to be accessed through child models.
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calebporzio
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Requires
- php: ^8.0
- illuminate/database: ^9.0||^10.0||^11.0
- illuminate/events: ^9.0||^10.0||^11.0
Requires (Dev)
- orchestra/testbench: ^7.0||^8.0||^9.0
- phpunit/phpunit: ^9.5.10||^10.5
- tightenco/duster: ^2.7
This package is auto-updated.
Last update: 2024-03-14 15:51:15 UTC
README
Parental
Parental is a Laravel package that brings STI (Single Table Inheritance) capabilities to Eloquent.
What is single table inheritance (STI)?
It's a fancy name for a simple concept: Extending a model (usually to add specific behavior), but referencing the same table.
Installation
composer require tightenco/parental
Simple Usage
namespace App\Models; use Illuminate\Database\Eloquent\Model; use Parental\HasChildren; // The "parent" class User extends Model { use HasChildren; // }
namespace App\Models; use Parental\HasParent; // The "child" class Admin extends User { use HasParent; public function impersonate($user) { //... } }
use App\Models\Admin; // Returns "Admin" model, but reference "users" table: $admin = Admin::first(); // Can now access behavior exclusive to "Admin"s $admin->impersonate($user);
What problem did we just solve?
Without Parental, calling Admin::first()
would throw an error because Laravel would be looking for an admins
table. Laravel generates expected table names, as well as foreign keys and pivot table names, using the model's class name. By adding the HasParent
trait to the Admin model, Laravel will now reference the parent model's class name users
.
Accessing Child Models from Parents
// First, we need to create a `type` column on the `users` table Schema::table('users', function ($table) { $table->string('type')->nullable(); });
namespace App\Models; use Illuminate\Database\Eloquent\Model; use Parental\HasChildren; // The "parent" class User extends Model { use HasChildren; protected $fillable = ['type']; }
namespace App\Models; use Parental\HasParent; // A "child" class Admin extends User { use HasParent; }
namespace App\Models; use Parental\HasParent; // Another "child" class Guest extends User { use HasParent; }
use App\Models\Admin; use App\Models\Guest; use App\Models\User; // Adds row to "users" table with "type" column set to: "App/Admin" Admin::create(...); // Adds row to "users" table with "type" column set to: "App/Guest" Guest::create(...); // Returns 2 model instances: Admin, and Guest User::all();
What problem did we just solve?
Before, if we ran: User::first()
we would only get back User
models. By adding the HasChildren
trait and a type
column to the users
table, running User::first()
will return an instance of the child model (Admin
or Guest
in this case).
Type Aliases
If you don't want to store raw class names in the type column, you can override them using the $childTypes
property.
namespace App\Models; use Illuminate\Database\Eloquent\Model; use Parental\HasChildren; class User extends Model { use HasChildren; protected $fillable = ['type']; protected $childTypes = [ 'admin' => Admin::class, 'guest' => Guest::class, ]; }
Now, running Admin::create()
will set the type
column in the users
table to admin
instead of App\Models\Admin
.
This feature is useful if you are working with an existing type column, or if you want to decouple application details from your database.
Custom Type Column Name
You can override the default type column by setting the $childColumn
property on the parent model.
namespace App\Models; use Illuminate\Database\Eloquent\Model; use Parental\HasChildren; class User extends Model { use HasChildren; protected $fillable = ['parental_type']; protected $childColumn = 'parental_type'; }
Laravel Nova Support
If you want to use share parent Nova resources with child models, you may register the following provider at the end of the boot method of your NovaServiceProvider:
class NovaServiceProvider extends NovaApplicationServiceProvider { public function boot() { parent::boot(); // ... $this->app->register(\Parental\Providers\NovaResourceProvider::class); } }
Thanks to @sschoger for the sick logo design, and @DanielCoulbourne for helping brainstorm the idea on Twenty Percent Time.