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BelongsTo.php
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BelongsTo.php
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<?php namespace Moloquent\Relations;
class BelongsTo extends \Illuminate\Database\Eloquent\Relations\BelongsTo
{
/**
* Set the base constraints on the relation query.
*/
public function addConstraints()
{
if (static::$constraints) {
// For belongs to relationships, which are essentially the inverse of has one
// or has many relationships, we need to actually query on the primary key
// of the related models matching on the foreign key that's on a parent.
$this->query->where($this->otherKey, '=', $this->parent->{$this->foreignKey});
}
}
/**
* Set the constraints for an eager load of the relation.
*
* @param array $models
*/
public function addEagerConstraints(array $models)
{
// We'll grab the primary key name of the related models since it could be set to
// a non-standard name and not "id". We will then construct the constraint for
// our eagerly loading query so it returns the proper models from execution.
$key = $this->otherKey;
$this->query->whereIn($key, $this->getEagerModelKeys($models));
}
/**
* Match the eagerly loaded results to their parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function match(array $models, \Illuminate\Database\Eloquent\Collection $results, $relation)
{
$foreign = $this->foreignKey;
$other = $this->otherKey;
// First we will get to build a dictionary of the child models by their primary
// key of the relationship, then we can easily match the children back onto
// the parents using that dictionary and the primary key of the children.
$dictionary = [];
foreach ($results as $result) {
$dictionary[$result->getAttribute($other)] = $result;
}
// Once we have the dictionary constructed, we can loop through all the parents
// and match back onto their children using these keys of the dictionary and
// the primary key of the children to map them onto the correct instances.
foreach ($models as $model) {
if (isset($dictionary[(string) $model->$foreign])) {
$model->setRelation($relation, $dictionary[(string) $model->$foreign]);
}
}
return $models;
}
}