Laravel 关系：hasOne 与 belongsToMany

Question

我有 3 个 table：

   Schema::create('item_types', function (Blueprint $table) {
        $table->increments('id')->unsignet();
        $table->string('name')->unique();
    });

    Schema::create('items', function (Blueprint $table) {
        $table->increments('id')->unsignet();
        $table->string('name');
        $table->text('description');
        $table->string('photo');
        $table->integer('item_type_id')->unsignet(); //->nullable();
        $table->integer('brand_id')->unsignet(); //->nullable();
        $table->float('price')->unsignet();
        $table->timestamps();
    });

    Schema::create('brands', function (Blueprint $table) {
        $table->increments('id')->unsigned();
        $table->string('name');
        $table->string('logo');
        $table->text('description');
    });

需要他们之间的关系...

所以我设置：

hasOne for item_types and brands in Item.php 

belongsToMany for Items in ItemType.php and Brand.php

尝试了很多组合知道那很愚蠢，但无能为力)

当我像这样填写 table 时：

factory(App\Item::class, 5)->create()->each(function($i) {
        $i->type()->save(factory(App\ItemType::class)->make());
        $i->brand()->save(factory(App\Brand::class)->make());
}

获取错误：

Column not found: 1054 Unknown column 'item_type_id' in 'field list' (SQL: insert into item_types (name, item_type_id) values (et, 1))

如果我在 Item.php 中设置它：

`hasOne('App\ItemType', 'id', 'item_type_id');`

品牌相同

所有 table 都已填满，但项目 table 中的 item_type_id 和 brand_id 为空

[已解决]

下面的答案 +

factory(App\Item::class, 50)->create()->each(function($i) {
    $i->ItemType()
        ->associate(factory(App\ItemType::class)
        ->create());
    $i->brand()
        ->associate(factory(App\Brand::class)
        ->create());
    $i->save();

Answer 1

你的人际关系错了。永远记住狗和主人的插图：

[…] Let's say we have a Dog model and an Owner model. Immediately we can say the Owner has_one Dog and the Dog belongs_to Owner.

在您的特定情况下，您的狗是物品，它们的主人是物品类型和品牌：

# Item.php

public function itemType()
{
    return $this->belongsTo('App\ItemType');
}

public function brand()
{
    return $this->belongsTo('App\Brand');
}

还有另外两个类:

# ItemType.php

public function items()
{
    return $this->hasMany('App\Item');
}

# Brand.php

public function items()
{
    return $this->hasMany('App\Item');
}

编码愉快！

Laravel 关系：hasOne 与 belongsToMany

Laravel relationships: hasOne vs belongsToMany

orm

activerecord

one-to-many

laravel

eloquent