已解决:在下面发布的答案
如何从此数据透视表和规格表中获取值?
我想在以下模板中显示:
-Model(规范表中的名称)
- 品牌(属性表格数据透视表):example1(数据透视表中的值)
- 模型(属性表格数据透视表):example123(数据透视表中的值) ...
在ProductController中,我尝试返回类似$product = Product::with('specifications')->first();
的内容,但之后我只能从规格表中获取数据,如果我尝试$product = Product::with('product_specification')->first();
,我会收到错误Call to undefined relationship [product_specification] on model [App\Product].
数据透视表:
public function up()
{
Schema::create('product_specification', function (Blueprint $table) {
$table->engine = 'InnoDB';
$table->increments('id');
$table->integer('product_id')->unsigned()->index();
$table->foreign('product_id')->references('id')->on('products')->onDelete('cascade');
$table->integer('specification_id')->unsigned()->index();
$table->foreign('specification_id')->references('id')->on('specifications')->onDelete('cascade');
$table->string('attribute');
$table->string('value');
});
}
规格表:
public function up()
{
Schema::create('specifications', function (Blueprint $table) {
$table->engine = 'InnoDB';
$table->increments('id');
$table->string('name')->unique();
$table->timestamps();
});
}
产品型号:
public function specifications()
{
return $this->belongsToMany(Specification::class, 'product_specification');
}
答案 0 :(得分:3)
我必须将withPivot()添加到我的产品型号
public function specifications() {
return $this->belongsToMany(Specification::class, 'product_specification')->withPivot('attribute', 'value');
}
然后在模板中:
foreach($product->specifications as $specification) {
echo 'name: ' . $specification->name . ' attribute: ' . $specification->pivot->attribute . ' value ' . $specification->pivot->value . '</br>';
}