[英]laravel eloquent relation one to many returns null
當我收到傳入商品數據(belongsTo)時,產品數據始終返回null。
這是我的產品型號:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\SoftDeletes;
class Product extends Model
{
use SoftDeletes;
protected $guarded = [
'id', 'created_at', 'updated_at', 'deleted_at',
];
public function transaction_details()
{
return $this->hasMany('App\Transaction_detail');
}
public function incoming_goods()
{
return $this->hasMany('App\Incoming_good');
}
}
這是我的Incoming_good模型:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Incoming_good extends Model
{
protected $guarded = [
'id', 'created_at', 'updated_at',
];
public function product()
{
return $this->belongsTo('App\Product');
}
}
這是我對這兩個表的遷移:
產品表遷移:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateProductsTable extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->string('name', 50);
$table->integer('price');
$table->integer('stock')->nullable();
$table->integer('available');
$table->string('image1', 190)->nullable();
$table->string('image2', 190)->nullable();
$table->string('image3', 190)->nullable();
$table->string('image4', 190)->nullable();
$table->string('image5', 190)->nullable();
$table->timestamps();
$table->softDeletes();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('products');
}
}
entry_goods遷移:
<?php
use Illuminate\Support\Facades\Schema;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Database\Migrations\Migration;
class CreateTableIncomingGoods extends Migration
{
/**
* Run the migrations.
*
* @return void
*/
public function up()
{
Schema::create('incoming_goods', function (Blueprint $table) {
$table->increments('id');
$table->integer('product_id');
$table->integer('stock');
$table->text('note')->nullable();
$table->timestamps();
});
}
/**
* Reverse the migrations.
*
* @return void
*/
public function down()
{
Schema::dropIfExists('incoming_goods');
}
}
這是我的代碼,用於顯示incomong_goods數據和產品(relationshipToTo關系):
$data = Incoming_good::select('id', 'stock', 'note', 'created_at')->with('product')->get();
我嘗試使用alies,但是仍然返回產品數據null。 希望你能幫我 :)
為了使渴望加載的Product
與Incoming_good
相匹配,Laravel需要選擇外鍵。 由於您沒有在選擇列表中包含外鍵( product_id
),因此Laravel在檢索相關記錄后將無法匹配它們。 因此,您所有的product
關系都是空的。 將外鍵添加到選擇列表中,您應該會很好。
$data = Incoming_good::select('id', 'product_id', 'stock', 'note', 'created_at')
->with('product')
->get();
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