Laravel雄辩的忽略属性，如果在插入过程中不在表中 [英] Laravel Eloquent ignore attribute if not in table during insert

问题描述

我有一个Foo模型，它对应于具有以下各列的表.

I have a model Foo that corresponds to a table with the following columns.

id
说明
user_id

id
description
user_id

我要分别设置Foo模型的属性(无质量分配)

I'm setting the attributes of the Foo model individually (no mass assignment)

$foo = new Foo;

$foo->id = 1;
$foo->description = "hello kitty";
$foo->user_id = 55;

//...

$ foo被发送到另一个类以进行其他处理，但是由于该类需要更多信息，因此我想将其简单地添加到$ foo模型中.

$foo is sent to another class for additional processing, but because that class needs a bit more information, I would like to simply add it to the $foo model.

//...
$foo->bar = $additional_information;

Event::fire(DoStuffWithFoo($foo));

$foo->save();  //error

问题是当我$foo->save()时，它抱怨bar不是列.

the problem is when I $foo->save(), it complains that bar isn't a column.

我知道保存之前可以unset($foo->bar);，但是...

I know I can unset($foo->bar); before saving, but...

是否可以告诉Eloquent忽略任何不相关的属性?

Is it possible to tell Eloquent to simply ignore any non relevant attributes?

推荐答案

只需将$bar作为属性添加到foo类中即可:

Just add $bar as an attribute in your foo class:

class Foo extends Model
{

  public $bar;
  //...

现在您可以使用save()，Laravel不会尝试将bar存储在数据库中.

now you can use save() and Laravel will not try to store bar in the DB.

说明:

如果在模型上调用save()，则仅将数组$model->attributes中的那些属性保存到数据库中.如果将$bar定义为类Foo中的属性，则$foo->bar ="xyz"将永远不会以数组$model->attributes结尾.

If you call save() on a model, only those attributes that are in the array $model->attributes will be saved to the database. If you define $bar as an attribute in the class Foo, then $foo->bar ="xyz" will never end up in the array $model->attributes.

但是，如果尚未为Foo声明这样的属性，则会调用__set()，因为您

However, if you do not have declared such an attribute for Foo, then __set() is called because you try to save something in an inaccessible property.

您可以签出Laravel\Illuminate\Database\Eloquent\Model.php:

/**
     * Dynamically set attributes on the model.
     *
     * @param  string  $key
     * @param  mixed  $value
     * @return void
     */
    public function __set($key, $value)
    {
        $this->setAttribute($key, $value);
    }

基本上可以调用

$this->attributes[$key] = $value;

来自Laravel\Illuminate\Database\Eloquent\Concerns\HasAttributes.php.

现在$foo->bar ="xyz"最终会在$foo->attribute['bar']中变成蜜蜂，这就是为什么save()与..this column does not exists..崩溃的原因.

Now $foo->bar ="xyz" will end up beeing in $foo->attribute['bar'] and this is why save() crashes with ..this column does not exists...

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