设置hasOne与子模型的新实例的关系 [英] Set hasOne relation to new instance of child model

问题描述

使用Laravel 4.2，如何在不接触数据库的情况下将模型上的hasOne关系设置为新模型的实例?

Using Laravel 4.2, how can I set a hasOne relation on a model to an instance of a new model without touching the database?

我想执行以下操作，但是Laravel将实例视为属性，而不是子关系.

I want to do the following, but Laravel is treating the instance as a property, not a child relation.

class ParentClass extends \Eloquent {
  public function child() {
    return $this-hasOne('ChildClass', 'child_id', 'parent_id');
  }
}

$parent = new ParentClass();
$parent->child = new ChildClass();

推荐答案

为解决我的问题，我创建了一个Trait类，该类已添加到模型中，从而可以设置关系.这样做不会自动设置我的父/子关系值，因此在保存/推送之前，我必须小心手动进行此操作.

To get through my problem, I have created a Trait class that I added to my models that allows me to set a relation. Doing this does not automatically set my parent/child relation values so I have to be careful to do this manually before I save/push.

trait ModelSetRelationTrait
{
  public function setRelation($key, $model)
  {
    $this->relations[$key] = $model;
  }
}

class ParentClass extends \Eloquent {
  use ModelSetRelationTrait;
  public function child() {
    return $this-hasOne('ChildClass', 'child_id', 'parent_id');
  }
}

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