在Laravel 5.1中将模型保存到数据库之前执行一些操作 [英] Do something before saving model to database in Laravel 5.1
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问题描述
在Laravel 5.1模型中将数据写入数据库之前,我该如何做一些修改,例如修改某些数据字段或进行更多验证? 关于该问题的文档很难在实际应用中使用: http://laravel.com/docs/5.1/eloquent#events
How can I do something such as modify some data fields or more validate before writing data to database in Laravel 5.1 model ? It's document about that problem is hard to use in real application: http://laravel.com/docs/5.1/eloquent#events
我的代码是
<?php
namespace App;
use Illuminate\Database\Eloquent\Model;
use App\Helpers\Tools as Tools;
class Atoken extends Model
{
/**
* The database table used by the model.
*
* @var string
*/
protected $table = 'atoken';
/**
* The attributes that are mass assignable.
*
* @var array
*/
protected $fillable = [
'token',
'user_id',
'role',
];
/**
* The attributes excluded from the model's JSON form.
*
* @var array
*/
protected $hidden = [
];
public static function newToken($userId, $role){
# Remove all token assoiciate with input user;
Atoken::where('user_id', $userId)->delete();
$params = [
'user_id' => $userId,
'role' => $role,
];
Atoken::insert($params);
$item = Atoken::where('user_id', $userId)->first();
return $item->token;
}
protected static function boot(){
static::creating(function ($model) {
$model->token = 'sometoken';
});
}
}
在这种情况下,我总是会出错:
In this case, I always got error:
SQLSTATE[23502]: Not null violation: 7 ERROR: null value in column \"token\" violates not-null constraint (SQL: insert into \"atoken\" (\"user_id\", \"role\") values (2, USER))
我该如何解决?
推荐答案
class Lunch extends Eloquent
{
protected static function boot()
{
static::creating(function ($model) {
$model->topping = 'Butter';
return $model->validate();
});
}
protected function validate()
{
// Obviously do real validation here :)
return rand(0, 1) ? true : false;
}
public static function newToken($userId, $role)
{
static::where('user_id', $userId)->delete();
return static::create([
'user_id' => $userId,
'role' => $role,
])->token;
}
}
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