找不到列：1054“ where子句”中的未知列“ id”-Laravel

Question

There has been lot of issues on this but i am following the exact procedure to solve this issue as described in the other related SO questions yet i get the same error.

Shop

public function products()
    {
        return $this->hasMany('App\Product');
        //->withTimestamps();
    }

Product

public function shop()
    {
        return $this->belongsTo('App\Shop');    
        //->withTimestamps();
    }

This is how my schema looks like

    Schema::create('products', function (Blueprint $table) {
                $table->increments('product_id');
                $table->integer('shop_id')->unsigned()->nullable();
                $table->foreign('shop_id')->references('id')->on('shops');

                 $table->timestamps();
);

Controller

$products = new Product(array(
            'name' => $request->('name');
        ));

        $shop->products()->save($products);

After submitting my form data into the products table, i get an error Column not found: 1054 Unknown column 'id' in 'where clause' . Laravel by default seems to take id by default as my primary key but then it is product_id .

In my model, i have specified protected $primaryKey = 'product_id' and it wouldn't solve my problem. What am i doing differently ?

Answer 1

In the relationships you have to specify the name of the primary key when it is not called id, try to change the model like this:

SHOP

public function products()
    {
        return $this->hasMany('App\Product', 'product_id');
        //->withTimestamps();
    }

PRODUCT

public function shop()
    {
        return $this->belongsTo('App\Shop', 'product_id');    
        //->withTimestamps();
    }

In the documentation explains how it works: https://laravel.com/docs/5.5/eloquent-relationships#one-to-many

Answer 2

If you are using resoure routes, then you need to specify the route key name as well:

public function getRouteKeyName()
{
    return 'product_id';
}

Answer 3

I had tried with my local with following:

Schema:

Schema::create('shops', function (Blueprint $table) {
    $table->increments('id');
    $table->string('name');
    $table->timestamps();
});

Schema::create('products', function (Blueprint $table) {
    $table->increments('product_id');
    $table->string('name');
    $table->integer('shop_id')->unsigned()->nullable();
    $table->foreign('shop_id')->references('id')->on('shops');
    $table->timestamps();
});

Model relationship exactly same as your post.

Controller code:

$shop = new Shop;
$shop->name = 'test';
$shop->save();

$products = new Product;
$products->name = 'test';

$shop->products()->save($products);

And final result? It is saved into products table without error. I am using Laravel 5.4 at my local.

When it stated Unknown column 'id' in 'where clause' but does it stated is products table? Can you show the full Sql error log?

I suspect it might be other relationship caused the error.