无法在 laravel 刀片中显示外键值。php

Question

I want to show foreign key value in a blade. But I can't show I keep getting an error =

Trying to get property 'title' of non-object (View: C:\xampp\htdocs\CRUDAPP\resources\views\products\index.blade.php)

Here is my migration file:

product migration:

Schema::create('products', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->string('product_name');
            $table->decimal('price');
            $table->unsignedBigInteger('category');
            $table->foreign('category')
                ->references('id')
                ->on('categories')
                ->onDelete('cascade');
            $table->integer("quantity")->nullable();
            $table->boolean("is_out")->default(0);
        });

Category migration

Schema::create('categories', function (Blueprint $table) {
            $table->id();
            $table->timestamps();
            $table->string("title");
        });

Product Model:

class Product extends Model
{
    use HasFactory;
    protected $table = "products";
    protected $fillable = [
        "product_name",
        "price",
        "category",
        "quantity",
        "is_out"
    ];

    public function category()
    {
        return $this->belongsTo(Category::class);
    }
}

Category model:

class Category extends Model
{
    use HasFactory;
    protected $table = "categories";
    protected $fillable = [
        "title"
    ];

    public function products()
    {
        return $this->hasMany(Product::class);
    }
}

Here is my controller:

public function index()
    {
        $products = Product::with('category')->get();
        print_r($products);
        return view('products.index',[
            "products"=>$products
        ]);
    }

My blade:

<table border="1">
    <thead>
        <th>PRODUCTS NAME</th>
        <th>PRODUCTS PRICE</th>
        <th>PRODUCTS CATEGORY</th>
        <th>PRODUCTS STOCK</th>
        <th>PRODUCTS STATUS</th>
    </thead>

    <tbody>
    @foreach($products as $product)
        <tr>
            <td>{{ $product->product_name }}</td>
            <td>{{ $product->price }}</td>
            **<td>{{ $product->category->title }}</td>**
            <td>{{ $product->quantity }}</td>
            <td>{{ $product->is_out }}</td>
        </tr>
    @endforeach
    </tbody>
</table>

I am trying to show category title. I don't know why I am getting error. I have tried a lot of ways to solve it but can't figure the main problem. I am new laravel.

Answer 1

Change public function products() to public function product() at your Category model.

You have an excess of the letter s at the end of the function name (product s ), you must give the function name the exact same as the model you want to connect to, because the name of the model you want to connect to is product , then the name of the function that connects to that ( product ) model must also be product , unless you specify the foreign key as the second parameter in the method you write in the function

Answer 2

I think you should change like this:

public function category()
{
    return $this->belongsTo(Category::class, 'category', 'id);
}

This is belongsTo relationship

public function belongsTo(
    $related,
    $foreignKey = null,
    $ownerKey = null,
    $relation = null
) { }
@param string $related

@param string|null $foreignKey

@param string|null $ownerKey

@param string|null $relation

Answer 3

Your relation and column both have a name category . This will not work, so I suggest you rename the column to category_id , then the code will work as is.