Controller keeps generating SQL query with wrong foreign key name

I have a database tables Users, Listings Users table:

id, name, email, password

Listings table:

id, title, seller_id

Listing migration:

public function up()
    {
        Schema::create('listings', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->string('title');
            $table->bigInteger('seller_id')->unsigned();
            $table->timestamps();

            $table->foreign('seller_id')->references('id')->on('users')->onDelete('cascade');
        });
    }

User model:

public function listings()
    {
        return $this->hasMany(Listing::class);
    }

Listing model:

public function seller()
    {
        return $this->belongsTo(User::class, 'seller_id', 'id');
    }

ListingResource:

namespace App\Http\Resources;

use Illuminate\Http\Resources\Json\JsonResource;

class ListingResource extends JsonResource
{
    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request  $request
     * @return array
     */
    public function toArray($request)
    {
        return parent::toArray($request);
    }
}

ListingsController:

public function index()
    {
        return ListingResource::collection(auth()->user()->listings()->latest());
    }

I keep getting this error:

"SQLSTATE[42S22]: Column not found: 1054 Unknown column 'listings.user_id' in 'where clause' (SQL: select * from listings where listings.user_id = 1 and listings.user_id is not null order by created_at desc limit 1)"

How come it returns the query with user_id as the foreign key, even though I specifically put 'seller_id' as the foreign key inside the User.php model?

I have tried to put:

    public function listings()
    {
        return $this->hasMany(Listing::class, 'seller_id');
    }

As I have read that this could work, but this generates the following error:

"Call to undefined method Illuminate\Database\Eloquent\Relations\HasMany::mapInto()"