Relationships
model A: User
protected $fillable = [ DBのカラム]
public function messages) {
return $this->hasMany(Message::class);
}
model B: Message
protected $fillable = [ DBのカラム] foreign_key は登録しなくてOK
public function users() {
return $this->belongsTo(User::class);
}
DB_B 側に foreign_keyを設定(この場合user_id)
tinkerの操作
userを作成した状態で...
$user=App\User::find(1)->messages()->create(['message'=>'test from tinker'])
=> App\Message {#703
message: "test from tinker",
user_id: 1,
updated_at: "2017-05-13 13:35:31",
created_at: "2017-05-13 13:35:31",
id: 1,
}
＊messagesのカラムにid, timestamps, foreign_key以外設定しなかった場合
= protected $fillable を設定していない場合
$user=App\User::find(1)->messages()->create()
→ ERROR
$user=App\User::find(1)->messages()->create([])
=> App\Message {#678
user_id: 1,
updated_at: "2017-05-13 20:22:52",
created_at: "2017-05-13 20:22:52",
id: 1,
}
Max section4 lecture21
model A: Post
public function categories() {
return $this->belongsToMany(Category::class)
}
model B: Category
public function posts() {
return $this->belongsToMany(Post::class)
}
table: A table: B ともにforeign_keyなし
- create intermediate table
php artisan make:migration create_category_post_table --create="category_post"
intermediate table 内に foreign_keyを作る
$table=>integer('category_id');
$table=>integer('post_id');
category, post tableの各々にデータを作成
- category, post の各関係をcategory_postにデータ作成
それぞれのORMインスタンスを生成後attach()
$post = App\Post::find(5)
$category = App\Category::find(8)
$post->categories()->attach($category)
特定の$postを特定の$categoryにattach
tinker上で
$post=App\Post::find(1)->categories()
=> Illuminate\Database\Eloquent\Collection {#710
all: [
App\Category {#708
id: 1,
created_at: null,
updated_at: null,
pivot: Illuminate\Database\Eloquent\Relations\Pivot {#693
post_id: 1,
category_id: 1,
},
},
],
}
>>> $user=App\User::find(2)->categories
=> Illuminate\Database\Eloquent\Collection {#715
all: [
App\Category {#719
id: 3,
created_at: null,
updated_at: null,
pivot: Illuminate\Database\Eloquent\Relations\Pivot {#707
post_id: 2,
category_id: 3,
},
},
App\Category {#716
id: 2,
created_at: null,
updated_at: null,
pivot: Illuminate\Database\Eloquent\Relations\Pivot {#678
post_id: 2,
category_id: 2,
},
},
],
}
$post=App\Post::find(2)->caetegories()->orderBy('id')->get()
