我是Laravel的初学者。我在我的项目Laravel 5.8中使用。
我有这个模式：
Schema::create('product_selected_categories', function (Blueprint $table) {
$table->bigIncrements('id');
$table->bigInteger('category_id')->unsigned()->index();
//$table->foreign('category_id')->references('id')->on('product_categories');
$table->bigInteger('subcategory1_id')->default(0);
$table->bigInteger('parent_subcategory1_id')->default(0);
$table->bigInteger('subcategory2_id')->default(0);
$table->bigInteger('parent_subcategory2_id')->default(0);
$table->bigInteger('subcategory3_id')->default(0);
$table->bigInteger('parent_subcategory3_id')->default(0);
$table->bigInteger('subcategory4_id')->default(0);
$table->bigInteger('parent_subcategory4_id')->default(0);
$table->bigInteger('subcategory5_id')->default(0);
$table->bigInteger('parent_subcategory5_id')->default(0);
$table->bigInteger('subcategory6_id')->default(0);
$table->bigInteger('parent_subcategory6_id')->default(0);
$table->bigInteger('subcategory7_id')->default(0);
$table->bigInteger('parent_subcategory7_id')->default(0);
$table->bigInteger('subcategory8_id')->default(0);
$table->bigInteger('parent_subcategory8_id')->default(0);
$table->bigInteger('subcategory9_id')->default(0);
$table->bigInteger('parent_subcategory9_id')->default(0);
$table->bigInteger('product_id')->unsigned()->index();
$table->foreign('product_id')->references('id')->on('products')->onDelete('cascade');;
});
Schema::create('products', function (Blueprint $table) {
$table->bigIncrements('id');
$table->bigInteger('company_id')->unsigned();
$table->foreign('company_id')->references('id')->on('companies')->onDelete('cascade');
//$table->bigInteger('category_id')->unsigned();
//$table->foreign('category_id')->references('id')->on('product_categories');
$table->smallInteger('id_delivery_vat')->unsigned();
$table->foreign('id_delivery_vat')->references('id')->on('vat');
$table->smallInteger('id_product_vat')->unsigned();
$table->foreign('id_product_vat')->references('id')->on('vat');
$table->bigInteger('id_producer')->unsigned();
//$table->foreign('id_producer')->references('id')->on('product_producers');
$table->string('name', 120)->nullable();
$table->string('qr_code', 120)->nullable();
$table->string('oe_code', 120)->nullable();
$table->char('enable', 1)->default(0);
$table->char('promo', 1)->default(0);
$table->longText('description')->nullable();
$table->decimal('product_price', 9, 2)->default(0);
$table->decimal('promo_product_price', 9, 2)->default(0);
$table->decimal('product_delivery_price', 9, 2)->default(0);
$table->unsignedInteger('quantity')->default(0);
$table->string('url_address', 160);
$table->timestamps();
$table->engine = "InnoDB";
$table->charset = 'utf8mb4';
$table->collation = 'utf8mb4_unicode_ci';
});
Schema::create('product_categories', function (Blueprint $table) {
$table->bigIncrements('id');
$table->bigInteger('company_id')->unsigned();
$table->foreign('company_id')->references('id')->on('companies')->onDelete('cascade');
$table->char('enable', 1)->default(0);
$table->string('name', 85)->nullable();
$table->string('url_address', 160);
$table->integer('level')->default(0);
//$table->bigInteger('parent_id')->default(0);
//$table->bigInteger('parent_id')->nullable();
$table->unsignedBigInteger('parent_id')->nullable();
$table->foreign('parent_id')->references('id')->on('product_categories')->onDelete('cascade');
$table->bigInteger('number')->default(0);
$table->timestamps();
$table->engine = "InnoDB";
$table->charset = 'utf8mb4';
$table->collation = 'utf8mb4_unicode_ci';
});
型号：
class ProductSelectedCategory extends Model
{
protected $quarded = ['id'];
protected $fillable = ['subcategory1_id', 'parent_subcategory1_id', 'category_id', 'subcategory2_id', 'parent_subcategory2_id', 'subcategory3_id', 'parent_subcategory3_id', 'subcategory4_id', 'parent_subcategory4_id', 'subcategory5_id', 'parent_subcategory5_id', 'subcategory6_id', 'parent_subcategory6_id', 'subcategory7_id', 'parent_subcategory7_id', 'subcategory8_id', 'parent_subcategory8_id', 'subcategory9_id', 'parent_subcategory9_id', 'product_id' ];
public $timestamps = false;
}
class ProductCategory extends Model
{
use scopeActiveTrait;
protected $guarded = ['id'];
protected $fillable = ['company_id', 'enable', 'name', 'url_address', 'level', 'parent_id', 'number'];
public $timestamps = true;
//protected $table = 'products_category';
public function parent()
{
return $this->belongsTo('App\ProductCategory', 'parent_id', 'id');
}
public function children()
{
return $this->hasMany('App\ProductCategory', 'id', 'parent_id');
}
public function products()
{
return $this->belongsToMany(Product::class, 'product_selected_categories', 'category_id', 'product_id');
}
}
class Product extends Model
{
use scopeActiveTrait;
protected $fillable = ['company_id', 'id_delivery_vat', 'id_product_vat', 'id_producer', 'name', 'qr_code', 'oe_code', 'enable', 'promo', 'description', 'product_price', 'promo_product_price', 'product_delivery_price', 'quantity', 'url_address'];
protected $quarded = ['id'];
public $timestamps = true;
public function category()
{
return $this->belongsTo('App\ProductCategory', 'id_producer');
}
public function producer()
{
return $this->belongsTo('App\ProductProducer', 'id_producer');
}
public function selected_categories()
{
return $this->hasMany('App\ProductSelectedCategory');
}
}
我想显示带有类别名称的产品。 category_id = category.id subcategory1_id = category.id ..... 等
在刀片中，我有：
@foreach($products as $product)
{{ $product->name }} - {{ $product->selected_categories->first()->parent_subcategory2_id }},
@endforeach
这将返回我：产品名称-1（id类别）-3（id类别）。
我需要名字-不需要ID。我该如何更改？
答案 0 :(得分：0)
我不知道为什么您要在product_selected_categories表中填充所有这些子类别。您正在正确使用外键约束，但是不必在模型中将保护设置为“ id”，因为如果未设置任何内容，则始终将其设置为“ id”列。
此外，除非您有其他类别的类别，否则我将把products_categories表称为类别。
如果您只想与类别建立一对多关系，则可以使用Laravel（https://laravel.com/docs/5.8/eloquent-relationships#one-to-many）的内置功能。目前，该数据库看起来不太好。
然后，如果您想要一个类别的名称，只需键入
@foreach($products as $product)
{{ $product->name }} - {{ $product->category->name }}
@endforeach
如果您想保持目前的状态（我不建议这样做），可以使用
@foreach($products as $product)
{{ $product->name }} - {{ $product->selected_categories->first()->name}},
@endforeach