laravel 扩展 Eloquent 的类的构造函数
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Constructors on classes extending Eloquent
提问by vikingsfan19
I just started a new website and I wanted to make use of Eloquent. In the process of seeding my database, I noticed that I would get empty rows added if I had included any kind of constructor on the model that extends eloquent. For example, running this seeder:
我刚刚创建了一个新网站，我想使用 Eloquent。在为我的数据库做种的过程中，我注意到如果我在扩展 eloquent 的模型上包含任何类型的构造函数，我会添加空行。例如，运行这个播种机：
<?php
class TeamTableSeeder extends Seeder {
public function run()
{
DB::table('tm_team')->delete();
Team::create(array(
'city' => 'Minneapolis',
'state' => 'MN',
'country' => 'USA',
'name' => 'Twins'
)
);
Team::create(array(
'city' => 'Detroit',
'state' => 'MI',
'country' => 'USA',
'name' => 'Tigers'
)
);
}
}
With this as my Team class:
以此作为我的团队课程：
<?php
class Team extends Eloquent {
protected $table = 'tm_team';
protected $primaryKey = 'team_id';
public function Team(){
// null
}
}
Yields this:
产生这个：
team_id | city | state | country | name | created_at | updated_at | deleted_at
1 | | | | | 2013-06-02 00:29:31 | 2013-06-02 00:29:31 | NULL
2 | | | | | 2013-06-02 00:29:31 | 2013-06-02 00:29:31 | NULL
Simply removing the constructor all together allows the seeder to work as expected. What exactly am I doing wrong with the constructor?
简单地一起删除构造函数允许播种机按预期工作。我到底在构造函数上做错了什么？
回答by Jan P.
You have to call parent::__constructto make things work here, if you look at the constructor of the Eloquentclass:
parent::__construct如果您查看Eloquent类的构造函数，则必须调用以使事情在这里工作：
public function __construct(array $attributes = array())
{
if ( ! isset(static::$booted[get_class($this)]))
{
static::boot();
static::$booted[get_class($this)] = true;
}
$this->fill($attributes);
}
The bootmethod is called and the bootedproperty is set. I don't really know what this is doing but depending on your problem it seems relevant :P
该boot方法被称为和booted属性设置。我真的不知道这是在做什么，但根据您的问题，它似乎相关：P
Refactor your constructor to get the attributesarray and put it to the parent constructor.
重构您的构造函数以获取attributes数组并将其放入父构造函数。
Update
更新
Here is the needed code:
这是所需的代码：
class MyModel extends Eloquent {
public function __construct($attributes = array()) {
parent::__construct($attributes); // Eloquent
// Your construct code.
}
}
回答by Chemaclass
In laravel 3 you must put the second parameter '$exists' with default value "false".
在 Laravel 3 中，您必须将第二个参数 '$exists' 设置为默认值“false”。
class Model extends Eloquent {
public function __construct($attr = array(), $exists = false) {
parent::__construct($attr, $exists);
//other sentences...
}
}
回答by overcomer
You can use this generic method that allows you to pass a parameter too.
您也可以使用这种允许您传递参数的通用方法。
/**
* Overload model constructor.
*
* $value sets a Team's value (Optional)
*/
public function __construct($value = null, array $attributes = array())
{
parent::__construct($attributes);
$this->value = $value;
// Do other staff...
}
