Laravel Relationship Events-白红宇

Laravel Relationship Events

阅读量：5149 次

发布时间：2019-06-13

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Laravel Relationship Events is a package by Viacheslav Ostrovskiy that adds extra model relationship events. This package comes with the following traits that are used to register listeners on a model’s boot() method:

HasOneEvents

HasBelongsToEvents

HasManyEvents

HasBelongsToManyEvents

HasMorphOneEvents

HasMorphToEvents

HasMorphManyEvents

HasMorphToManyEvents

HasMorphedByManyEvents

And from the above traits, here’s an example of a few events on a Country model that has many Users using the HasManyEventstrait:

namespace App\Models;use App\User; use Chelout\RelationshipEvents\Concerns\HasManyEvents; use Illuminate\Database\Eloquent\Model; class Country extends Model { use HasManyEvents; protected $fillable = [ 'name', ]; public function users() { return $this->hasMany(User::class); } public static function boot() { parent::boot(); static::hasManySaving(function ($parent, $related) { Log::info("Saving user's country {$parent->name}."); }); static::hasManySaved(function ($parent, $related) { Log::info("User's country is now set to {$parent->name}."); }); } }

And the inverse of the relationship with this package might look like the following:

namespace App\Models;use Illuminate\Database\Eloquent\Model; use Chelout\RelationshipEvents\Concerns\HasBelongsToEvents; class User extends Model { use HasBelongsToEvents; /** * Get the country associated with the user. */ public function country() { return $this->belongsTo(Country::class); } protected static function boot() { parent::boot(); static::belongsToAssociating(function ($relation, $related, $parent) { Log::info("Associating country {$parent->name} with user."); }); static::belongsToAssociated(function ($relation, $related, $parent) { Log::info("User has been assosiated with country {$parent->name}."); }); } }

Using an overloaded associate() method, you can fire two events belongsToAssociating and belongsToAssociated:

$country = App\Models\Country::first();$user = factory(User::class)->create([    'name' => 'John Smith',]);// Assosiate user with country// This will fire belongsToAssociating and belongsToAssociated events$user->country()->associate($country);