Laravel eloquent unconventional column not working - php

Question

Hi laravel is not inserting correct value in pivot table for many to many case.
Here my first model is
class ShippingAddress extends Eloquent {
protected $guarded = array('id');
protected $table = 'shippingAddress';
public function mwsOrder()
{
return $this->belongsToMany('MwsOrder',
'mwsOrders_shippingAddress',
'Address_id',
'AmazonOrderId'
);
}
}
Second Model is
class MwsOrder extends Eloquent {
protected $table = 'mwsOrders';
protected $primaryKey = 'AmazonOrderId';
public function shippAddress()
{
return $this->belongsToMany('ShippingAddress',
'mwsOrders_shippingAddress',
'AmazonOrderId',
'Address_id'
);
}
}
EER Diagram
Now when i run this
$mwsOrder = new MwsOrder;
$mwsOrder->AmazonOrderId = 'Eve 6';
$mwsOrder->save();
$address = new ShippingAddress;
$address->name = 'Naruto Uzumaki';
$address->save();
$address->mwsOrder()->attach($mwsOrder);
//$mwsOrder->shippAddress()->save($address);
laravel throws error and this is what laravel trying to run the query
(SQL: insert into mwsOrders_shippingAddress (Address_id,
AmazonOrderId) values (1, 3))
What i need is to generate this query
insert into mwsOrders_shippingAddress (Address_id,
AmazonOrderId) values (1, 'Eve 6')
Update:
Schema are:
Schema::create("shippingAddress", function(Blueprint $table)
{
$table->increments("id");
$table->string("Name");
$table->timestamps();
});
Schema::create("mwsOrders", function(Blueprint $table)
{
$table->increments("id");
$table->string("AmazonOrderId")->unique();
$table->timestamps();
});
Schema::create("mwsOrders_shippingAddress", function(Blueprint $table)
{
$table->increments("id");
$table->string("AmazonOrderId");
$table->foreign("AmazonOrderId")->references("AmazonOrderId")->on('mwsOrders');
$table->integer("shipping_address_id")->unsigned();
$table->foreign("shipping_address_id")->references('id')->on('shippingAddress');
$table->timestamps();
});

Answer 1

At first change the shippAddress to this:
// Specify the primary key because it's not conventional id
protected $primaryKey = 'AmazonOrderId';
public function shippAddress()
{
return $this->belongsToMany('ShippingAddress',
'mwsOrders_shippingAddress',
'AmazonOrderId',
'Address_id'
);
}
Then you may try this:
$mwsOrder = new MwsOrder;
$mwsOrder->AmazonOrderId = 'Eve 6';
$mwsOrder->save();
$address = new ShippingAddress(['name' => 'Naruto Uzumaki']);
$mwsOrder->shippAddress()->save($address); // Save and Attach