HasOne.php
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HasOne.php
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	<?php

	namespace LdapRecord\Models\Relations;

	use LdapRecord\Models\Model;

	class HasOne extends Relation
	{
	/**
	* Get the results of the relationship.
	*
	* @return \LdapRecord\Query\Collection
	*/
	public function getResults()
	{
	$model = $this->getForeignModelByValue(
	$this->getFirstAttributeValue($this->parent, $this->relationKey)
	);

	return $this->transformResults(
	$this->parent->newCollection($model ? [$model] : null)
	);
	}

	/**
	* Attach a model instance to the parent model.
	*
	* @param Model\|string $model
	* @return Model\|string
	*
	* @throws \LdapRecord\LdapRecordException
	*/
	public function attach($model)
	{
	$foreign = $model instanceof Model
	? $this->getForeignValueFromModel($model)
	: $model;

	$this->parent->setAttribute($this->relationKey, $foreign)->save();

	return $model;
	}

	/**
	* Detach the related model from the parent.
	*
	* @return void
	*
	* @throws \LdapRecord\LdapRecordException
	*/
	public function detach()
	{
	$this->parent->setAttribute($this->relationKey, null)->save();
	}
	}