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Question

我有两个型号的产品和图片，其中产品可以有一张或多张图片，图片有一个与之相关的产品，这些是我的模型

产品型号

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\HasMany;
use OwenIt\Auditing\Contracts\Auditable;
use OwenIt\Auditing\Auditable as AuditableTrait;

class Product extends Model implements Auditable
{
    use HasFactory, AuditableTrait;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'name',
        'price',
        'description'
    ];

    /**
     * Get all of the comments for the Product
     *
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function images(): HasMany
    {
        return $this->hasMany(Image::class);
    }
}

产品迁移

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateProductsTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('products', function (Blueprint $table) {
            $table->id();
            $table->string('name');
            $table->double('price');
            $table->text('description');
            $table->timestamps();
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('products');
    }
}

图像模型

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;

class Image extends Model
{
    use HasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var array
     */
    protected $fillable = [
        'filename',
    ];

    /**
     * Get the user that owns the Image
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function product(): BelongsTo
    {
        return $this->belongsTo(Product::class);
    }
}

图片迁移

<?php

use Illuminate\Database\Migrations\Migration;
use Illuminate\Database\Schema\Blueprint;
use Illuminate\Support\Facades\Schema;

class CreateImagesTable extends Migration
{
    /**
     * Run the migrations.
     *
     * @return void
     */
    public function up()
    {
        Schema::create('images', function (Blueprint $table) {
            $table->id();
            $table->string('filename');
            $table->bigInteger('product_id')->unsigned();
            $table->timestamps();

            $table->foreign('product_id')->references('id')->on('products')->onDelete('cascade');
        });
    }

    /**
     * Reverse the migrations.
     *
     * @return void
     */
    public function down()
    {
        Schema::dropIfExists('images');
    }
}

我制作了一个 productController 来管理数据，但我没有得到完整的响应，我只得到每个表数据，而不是响应中包含的关系

我正在使用 laravel 8x

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productController php

<?php

namespace App\Http\Controllers\Api;

use App\Http\Controllers\Controller;
use App\Models\Product;
use Illuminate\Http\Request;


class ProductController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return \Illuminate\Http\Response
     */
    public function index()
    {
        return Product::with('images')->get();
    }
}

Answer 1

在产品型号中：

public function image()
{
   return $this->hasOne(Image::class, 'pro_id');
}

在图像模型中：

public function product()
{
    return $this->belongsTo(product::class, 'pro_id');
}

在控制器中：

$img = product::find($id)->image->filename;

确保图像表中有产品记录。否则，您必须管理错误。

从 hasMany/belongsTo laravel 关系中获取数据

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1 个答案: