I'm a new bit who is trying to build an app using Laravel 5.5, and the Eloquent model.
I have two classes: (1) Customer and (2) VIPCustomer which extends Customer.
You may immediately tell VIPCustomer contains all attributes that a customer has, and other extra attributes.
Just to be clear, a customer may not be a VIP, and a VIP must be a customer; The customer may immediately opt-in to be a VIP the first time he shops.
Therefore, I am attempting to do something like this in the database:
Customer:
+------------------------+
|id|name|gender|join_date|
+------------------------+
VIPCustomer:
+----------------------------------+
|customer_id|valid_until|type|point|
+----------------------------------+
(customer_id is a foriegn key referencing Customer.id)
And accordingly, in the model php file:
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
class Customer extends Model
{
}
.
namespace App;
use Illuminate\Database\Eloquent\Model;
class VIPCustomer extends Customer
{
public $incrementing = false;
}
And that's it? I saw there are others saying I should using polymorphic relationship but I don't understand what it means.
In addition, is it possible to do instantiate a new VIP Customer something like this?
$customer = new VIPCustomer;
$customer->name = 'Alice';
$customer->gender = 'F';
$customer->type = 'gold';
$customer->point = 0;
$customer->save();
On top of that, say when the VIP membership ends, is it possible to preserve that person as Customer ? Because I'm afraid deleting that person will delete him from both Customer and VIPCustomer tables.
Thank you very much in advance.
Your current VIPCustomer
class looks like a class that holds a VIP data, not a subject (a customer). Then so, I would rename it as VIPCustomerData
here and make a new VIPCustomer
to inherit Customer
class instead.
class Customer extends Model
{
protected $table = 'customers';
}
Make sure you define the table name to avoid it being guessed by inheritance. Then tell VIPCustomer
to has a relation to VIPCustomerData
.
class VIPCustomer extends Customer
{
public function vipData()
{
return $this->hasOne(VIPCustomerData::class, 'customer_id', 'id');
}
}
Now, the problem is whenever you're going to retrieve VIP customers like VIPCustomer::get()
, you'll get whole customers instead. So, applying global scope is needed.
class VIPCustomer extends Customer
{
protected static function boot()
{
parent::boot();
static::addGlobalScope('weareviptypeofcustomer', function ($q) {
$q->has('vipData'); // only customers with vip data
});
}
public function vipData()
{
return $this->hasOne(VIPCustomerData::class, 'customer_id', 'id');
}
}
To create a new Customer as VIP, of course 2 queries is needed to insert here. Example,
$vipCustomer = new VIPCustomer;
$vipCustomer->name = 'Alice';
$vipCustomer->gender = 'F';
$vipCustomer->save();
$vipCustomerData = new VIPCustomerData;
$vipCustomerData->type = 'gold';
$vipCustomerData->point = 0;
$vipCustomer->vipData()->save($vipCustomerData);
Example of updating point.
$vipCustomerData = $vipCustomer->vipData; // or $vipCustomer->vipData()->first();
$vipCustomerData->point = 10;
$vipCustomerData->save();
Example of removing VIP status from customer. Of course just delete VIPCustomerData from its table.
$vipCustomer->vipData()->delete();
However, it's better to maintain these subjects as one class if there is no special column to treat each subject differently.
class Customer extends Model
{
protected $table = 'customers';
protected $with = ['vipData']; // always eager load related 'vipData'
protected $appends = ['is_vip']; // append 'is_vip' accessor
public function vipData()
{
return $this->hasOne(static::class, 'customer_id', 'id');
}
public function getIsVipAttribute()
{
return (bool) $this->vipData;
}
}
$customers = Customer::all();
foreach($customers as $customer) {
if ($customer->is_vip) {
// is VIP
} else {
}
}
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