Help needed: Unknown column - One to many relation

[patsa]

Hi there,

I have a problem. I have a one to many relation between my to models 'Vendor' and 'Product'.

Vendor.php:

... public function products() { return $this->hasMany(Product::class, 'vendor_id', 'id'); } ...

Product.php:
... public function vendor() { return $this->belongsTo(Vendor::class); } ...

The migrations looks like this:
xxx_create_product_table.php:
... $table->unsignedBigInteger('vendor_id')->nullable(); $table->foreign('vendor_id')->references('id')->on('vendor'); ...

As you can easily see the relationship between a vendor and its many products is stored in the product table using the field vendor_id.
However, I get an error, when I try to select the products using the edit screen.
In the fields function in my VendorResource.php I have the following defined:
Relation::make('products.') ->fromModel(Product::class, 'title') ->multiple() ->title('Produkte'),

When trying to save changes to the field, I get the following error:
Column not found: 1054 Unknown column 'products' in 'field list' (SQL: update 'vendor' set 'products' = ["6"] ...

What am I missing here? The relation should only be saved in the product's column.

Thank you very much for your help!

Best regards,
Patrick