Column not found 1054 error when defining laravel relationship

I have two tables: Order and Order_details. Between these two tables, there is a one-to-many relationship.

Order fields are:

• id_order

• invoice

• customer_id

• user_id

• total

Order_details fields:

• order_detail_id
• order_id
• product_id
• qty
• price

order_id is a foreign key which references to id_order on orders table

Order Model

 //
protected $primaryKey = 'id_order';
protected $fillable = [
    'invoice', 'customer_id', 'user_id', 'total'
];

public function order_detail()
{
    return $this->hasMany(Order_detail::class);
}

Order_detail model

protected $primaryKey = 'order_detail_id';

protected $fillable = [
    'order_id', 'product_id', 'qty'
];

protected $guarded = [];

public function order()
{
    return $this->belongsTo(Order::class, 'order_id', 'order_detail_id');
}

When i tried to insert data to these table, i got an error

SQLSTATE[42S22]: Column not found: 1054 Unknown column 'order_id_order' in 'field list' (SQL: insert into `order_details` (`product_id`, `qty`, `order_id_order`, `updated_at`, `created_at`) values (8, 1, 10, 2020-09-07 10:30:04, 2020-09-07 10:30:04))

Why laravel assume i have order_id_order field instead of order_id? And how to fix it?

Thank you

Answer

Here, in your question, orders table is the parent table and order_details is the child table. So one order can have many order details. So there is one-to-many relationship.

In Order.php i.e order model, you need to have forward relation, with proper mapping with the primary key and foreign key.

public function orderDetails()
{
    #1st arg is related model,
    #2nd arg is related column of order_details table
    #3rd arg is related column of orders table
    return $this->hasMany(OrderDetail::class, 'order_id', 'order_id');
}

Now coming to OrderDetail.php i.e. order_detail model, you need to have inverse relation as given below.

public function order()
{
    #1st arg is related model,
    #2nd arg is related column of orders table
    #3rd arg is related column of order_details table
    return $this->belongsTo(Order::class, 'order_id', 'order_id');
}