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<?php
namespace Znck\Eloquent\Traits;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Model;
use Znck\Eloquent\Relations\BelongsToThrough as Relation;
trait BelongsToThrough
{
/**
* Define a belongs-to-through relationship.
*
* @param string $related
* @param array|string $through
* @param string|null $localKey
* @param string $prefix
* @param array $foreignKeyLookup
* @return \Znck\Eloquent\Relations\BelongsToThrough
*/
public function belongsToThrough($related, $through, $localKey = null, $prefix = '', $foreignKeyLookup = [])
{
$relatedInstance = $this->newRelatedInstance($related);
$throughParents = [];
$foreignKeys = [];
foreach ((array) $through as $model) {
$foreignKey = null;
if (is_array($model)) {
$foreignKey = $model[1];
$model = $model[0];
}
$instance = $this->belongsToThroughParentInstance($model);
if ($foreignKey) {
$foreignKeys[$instance->getTable()] = $foreignKey;
}
$throughParents[] = $instance;
}
foreach ($foreignKeyLookup as $model => $foreignKey) {
$instance = new $model;
if ($foreignKey) {
$foreignKeys[$instance->getTable()] = $foreignKey;
}
}
return $this->newBelongsToThrough($relatedInstance->newQuery(), $this, $throughParents, $localKey, $prefix, $foreignKeys);
}
/**
* Create a through parent instance for a belongs-to-through relationship.
*
* @param string $model
* @return \Illuminate\Database\Eloquent\Model
*/
protected function belongsToThroughParentInstance($model)
{
$segments = preg_split('/\s+as\s+/i', $model);
/** @var \Illuminate\Database\Eloquent\Model $instance */
$instance = new $segments[0];
if (isset($segments[1])) {
$instance->setTable($instance->getTable().' as '.$segments[1]);
}
return $instance;
}
/**
* Instantiate a new BelongsToThrough relationship.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param \Illuminate\Database\Eloquent\Model[] $throughParents
* @param string $localKey
* @param string $prefix
* @param array $foreignKeyLookup
* @return \Znck\Eloquent\Relations\BelongsToThrough
*/
protected function newBelongsToThrough(Builder $query, Model $parent, array $throughParents, $localKey, $prefix, array $foreignKeyLookup)
{
return new Relation($query, $parent, $throughParents, $localKey, $prefix, $foreignKeyLookup);
}
}