<?php
namespace Illuminate\Database\Eloquent\Relations;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Eloquent\Collection;
abstract class HasOneOrMany extends Relation
{
/**
* The foreign key of the parent model.
*
* @var string
*/
protected $foreignKey;
/**
* The local key of the parent model.
*
* @var string
*/
protected $localKey;
/**
* The count of self joins.
*
* @var int
*/
protected static $selfJoinCount = 0;
/**
* Create a new has one or many relationship instance.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @param string $foreignKey
* @param string $localKey
* @return void
*/
public function __construct(Builder $query, Model $parent, $foreignKey, $localKey)
{
$this->localKey = $localKey;
$this->foreignKey = $foreignKey;
parent::__construct($query, $parent);
}
/**
* Create and return an un-saved instance of the related model.
*
* @param array $attributes
* @return \Illuminate\Database\Eloquent\Model
*/
public function make(array $attributes = [])
{
return tap($this->related->newInstance($attributes), function ($instance) {
$this->setForeignAttributesForCreate($instance);
});
}
/**
* Set the base constraints on the relation query.
*
* @return void
*/
public function addConstraints()
{
if (static::$constraints) {
$this->query->where($this->foreignKey, '=', $this->getParentKey());
$this->query->whereNotNull($this->foreignKey);
}
}
/**
* Set the constraints for an eager load of the relation.
*
* @param array $models
* @return void
*/
public function addEagerConstraints(array $models)
{
$this->query->whereIn(
$this->foreignKey, $this->getKeys($models, $this->localKey)
);
}
/**
* Match the eagerly loaded results to their single parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function matchOne(array $models, Collection $results, $relation)
{
return $this->matchOneOrMany($models, $results, $relation, 'one');
}
/**
* Match the eagerly loaded results to their many parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
public function matchMany(array $models, Collection $results, $relation)
{
return $this->matchOneOrMany($models, $results, $relation, 'many');
}
/**
* Match the eagerly loaded results to their many parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @param string $type
* @return array
*/
protected function matchOneOrMany(array $models, Collection $results, $relation, $type)
{
$dictionary = $this->buildDictionary($results);
// Once we have the dictionary we can simply spin through the parent models to
// link them up with their children using the keyed dictionary to make the
// matching very convenient and easy work. Then we'll just return them.
foreach ($models as $model) {
if (isset($dictionary[$key = $model->getAttribute($this->localKey)])) {
$model->setRelation(
$relation, $this->getRelationValue($dictionary, $key, $type)
);
}
}
return $models;
}
/**
* Get the value of a relationship by one or many type.
*
* @param array $dictionary
* @param string $key
* @param string $type
* @return mixed
*/
protected function getRelationValue(array $dictionary, $key, $type)
{
$value = $dictionary[$key];
return $type === 'one' ? reset($value) : $this->related->newCollection($value);
}
/**
* Build model dictionary keyed by the relation's foreign key.
*
* @param \Illuminate\Database\Eloquent\Collection $results
* @return array
*/
protected function buildDictionary(Collection $results)
{
$foreign = $this->getForeignKeyName();
return $results->mapToDictionary(function ($result) use ($foreign) {
return [$result->{$foreign} => $result];
})->all();
}
/**
* Find a model by its primary key or return new instance of the related model.
*
* @param mixed $id
* @param array $columns
* @return \Illuminate\Support\Collection|\Illuminate\Database\Eloquent\Model
*/
public function findOrNew($id, $columns = ['*'])
{
if (is_null($instance = $this->find($id, $columns))) {
$instance = $this->related->newInstance();
$this->setForeignAttributesForCreate($instance);
}
return $instance;
}
/**
* Get the first related model record matching the attributes or instantiate it.
*
* @param array $attributes
* @param array $values
* @return \Illuminate\Database\Eloquent\Model
*/
public function firstOrNew(array $attributes, array $values = [])
{
if (is_null($instance = $this->where($attributes)->first())) {
$instance = $this->related->newInstance($attributes + $values);
$this->setForeignAttributesForCreate($instance);
}
return $instance;
}
/**
* Get the first related record matching the attributes or create it.
*
* @param array $attributes
* @param array $values
* @return \Illuminate\Database\Eloquent\Model
*/
public function firstOrCreate(array $attributes, array $values = [])
{
if (is_null($instance = $this->where($attributes)->first())) {
$instance = $this->create($attributes + $values);
}
return $instance;
}
/**
* Create or update a related record matching the attributes, and fill it with values.
*
* @param array $attributes
* @param array $values
* @return \Illuminate\Database\Eloquent\Model
*/
public function updateOrCreate(array $attributes, array $values = [])
{
return tap($this->firstOrNew($attributes), function ($instance) use ($values) {
$instance->fill($values);
$instance->save();
});
}
/**
* Attach a model instance to the parent model.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @return \Illuminate\Database\Eloquent\Model|false
*/
public function save(Model $model)
{
$this->setForeignAttributesForCreate($model);
return $model->save() ? $model : false;
}
/**
* Attach a collection of models to the parent instance.
*
* @param \Traversable|array $models
* @return \Traversable|array
*/
public function saveMany($models)
{
foreach ($models as $model) {
$this->save($model);
}
return $models;
}
/**
* Create a new instance of the related model.
*
* @param array $attributes
* @return \Illuminate\Database\Eloquent\Model
*/
public function create(array $attributes = [])
{
return tap($this->related->newInstance($attributes), function ($instance) {
$this->setForeignAttributesForCreate($instance);
$instance->save();
});
}
/**
* Create a Collection of new instances of the related model.
*
* @param array $records
* @return \Illuminate\Database\Eloquent\Collection
*/
public function createMany(array $records)
{
$instances = $this->related->newCollection();
foreach ($records as $record) {
$instances->push($this->create($record));
}
return $instances;
}
/**
* Set the foreign ID for creating a related model.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @return void
*/
protected function setForeignAttributesForCreate(Model $model)
{
$model->setAttribute($this->getForeignKeyName(), $this->getParentKey());
}
/**
* Perform an update on all the related models.
*
* @param array $attributes
* @return int
*/
public function update(array $attributes)
{
if ($this->related->usesTimestamps() && ! is_null($this->relatedUpdatedAt())) {
$attributes[$this->relatedUpdatedAt()] = $this->related->freshTimestampString();
}
return $this->query->update($attributes);
}
/**
* Add the constraints for a relationship query.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Builder $parentQuery
* @param array|mixed $columns
* @return \Illuminate\Database\Eloquent\Builder
*/
public function getRelationExistenceQuery(Builder $query, Builder $parentQuery, $columns = ['*'])
{
if ($query->getQuery()->from == $parentQuery->getQuery()->from) {
return $this->getRelationExistenceQueryForSelfRelation($query, $parentQuery, $columns);
}
return parent::getRelationExistenceQuery($query, $parentQuery, $columns);
}
/**
* Add the constraints for a relationship query on the same table.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Builder $parentQuery
* @param array|mixed $columns
* @return \Illuminate\Database\Eloquent\Builder
*/
public function getRelationExistenceQueryForSelfRelation(Builder $query, Builder $parentQuery, $columns = ['*'])
{
$query->from($query->getModel()->getTable().' as '.$hash = $this->getRelationCountHash());
$query->getModel()->setTable($hash);
return $query->select($columns)->whereColumn(
$this->getQualifiedParentKeyName(), '=', $hash.'.'.$this->getForeignKeyName()
);
}
/**
* Get a relationship join table hash.
*
* @return string
*/
public function getRelationCountHash()
{
return 'laravel_reserved_'.static::$selfJoinCount++;
}
/**
* Get the key for comparing against the parent key in "has" query.
*
* @return string
*/
public function getExistenceCompareKey()
{
return $this->getQualifiedForeignKeyName();
}
/**
* Get the key value of the parent's local key.
*
* @return mixed
*/
public function getParentKey()
{
return $this->parent->getAttribute($this->localKey);
}
/**
* Get the fully qualified parent key name.
*
* @return string
*/
public function getQualifiedParentKeyName()
{
return $this->parent->qualifyColumn($this->localKey);
}
/**
* Get the plain foreign key.
*
* @return string
*/
public function getForeignKeyName()
{
$segments = explode('.', $this->getQualifiedForeignKeyName());
return end($segments);
}
/**
* Get the foreign key for the relationship.
*
* @return string
*/
public function getQualifiedForeignKeyName()
{
return $this->foreignKey;
}
}