Many to many relationship in Voyager Admin Panel - mysql

Question

I get this error when I try to add a new item with the many to many relationship using the BREAD creator for voyager:
SQLSTATE[23000]: Integrity constraint violation: 1052 Column 'id' in
field list is ambiguous (SQL: select id from products inner join
order_product on products.id = order_product.product_id
where order_product.order_id is null) (View:
D:\WindowsFolders\Documents\PHP\Voyager-test\vendor\tcg\voyager\resources\views\bread\edit-add.blade.php)
I have followed the documentation and not really sure where I am having the issue. To me it looks like my many to many setup should work in normal Laravel, but it throws that error when I try to add a new order item in the voyager panel. And the documentation really don't specify what the extra field in the parent table should be(where I put a comment).
Here is my order and order-pivot table;
public function up()
{
Schema::create('orders', function (Blueprint $table) {
$table->increments('id');
$table->integer('user_id');
$table->text('comment')->nullable();
$table->integer('price');
$table->boolean('sent');
$table->boolean('paid');
$table->string('products'); // This thing
$table->timestamps();
});
Schema::create('order_product', function (Blueprint $table) {
$table->increments('id');
$table->integer('order_id')->unsigned();
$table->foreign('order_id')->references('id')->on('orders')->onDelete('cascade');
$table->integer('product_id')->unsigned();
$table->foreign('product_id')->references('id')->on('products');
$table->integer('amount');
$table->timestamps();
});
}
Here is the product table:
public function up()
{
Schema::create('products', function (Blueprint $table) {
$table->increments('id');
$table->string('title')->nullable();
$table->text('description');
$table->string('image');
$table->integer('price');
$table->string('slug')->unique();
$table->timestamps();
});
}
Here is the relationship function:
public function products()
{
return $this->belongsToMany(Product::class, 'order_product');
}
And lastly a picture from the Order BREAD part:

Answer 1

The MySQL error message is quite clear in this case: both products and order_product tables have id fields. The select list of the sql statement in the question simply has id, therefore MySQL cannot decide which table the id field should be selected from.
You need to prefix the field name with the table name to make it clear:
select products.id from ...

Answer 2

I had a similar issue and solved it by changing the relationship key from id to product_id inside the json options in Voyager Admin