<?php
namespace Illuminate\Database\Eloquent\Relations;
use Closure;
use Illuminate\Support\Arr;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Support\Traits\Macroable;
use Illuminate\Database\Eloquent\Builder;
use Illuminate\Database\Query\Expression;
use Illuminate\Database\Eloquent\Collection;
use Illuminate\Support\Traits\ForwardsCalls;
/**
* @mixin \Illuminate\Database\Eloquent\Builder
*/
abstract class Relation
{
use ForwardsCalls, Macroable {
__call as macroCall;
}
/**
* The Eloquent query builder instance.
*
* @var \Illuminate\Database\Eloquent\Builder
*/
protected $query;
/**
* The parent model instance.
*
* @var \Illuminate\Database\Eloquent\Model
*/
protected $parent;
/**
* The related model instance.
*
* @var \Illuminate\Database\Eloquent\Model
*/
protected $related;
/**
* Indicates if the relation is adding constraints.
*
* @var bool
*/
protected static $constraints = true;
/**
* An array to map class names to their morph names in database.
*
* @var array
*/
public static $morphMap = [];
/**
* Create a new relation instance.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Model $parent
* @return void
*/
public function __construct(Builder $query, Model $parent)
{
$this->query = $query;
$this->parent = $parent;
$this->related = $query->getModel();
$this->addConstraints();
}
/**
* Run a callback with constraints disabled on the relation.
*
* @param \Closure $callback
* @return mixed
*/
public static function noConstraints(Closure $callback)
{
$previous = static::$constraints;
static::$constraints = false;
// When resetting the relation where clause, we want to shift the first element
// off of the bindings, leaving only the constraints that the developers put
// as "extra" on the relationships, and not original relation constraints.
try {
return call_user_func($callback);
} finally {
static::$constraints = $previous;
}
}
/**
* Set the base constraints on the relation query.
*
* @return void
*/
abstract public function addConstraints();
/**
* Set the constraints for an eager load of the relation.
*
* @param array $models
* @return void
*/
abstract public function addEagerConstraints(array $models);
/**
* Initialize the relation on a set of models.
*
* @param array $models
* @param string $relation
* @return array
*/
abstract public function initRelation(array $models, $relation);
/**
* Match the eagerly loaded results to their parents.
*
* @param array $models
* @param \Illuminate\Database\Eloquent\Collection $results
* @param string $relation
* @return array
*/
abstract public function match(array $models, Collection $results, $relation);
/**
* Get the results of the relationship.
*
* @return mixed
*/
abstract public function getResults();
/**
* Get the relationship for eager loading.
*
* @return \Illuminate\Database\Eloquent\Collection
*/
public function getEager()
{
return $this->get();
}
/**
* Execute the query as a "select" statement.
*
* @param array $columns
* @return \Illuminate\Database\Eloquent\Collection
*/
public function get($columns = ['*'])
{
return $this->query->get($columns);
}
/**
* Touch all of the related models for the relationship.
*
* @return void
*/
public function touch()
{
$model = $this->getRelated();
if (! $model::isIgnoringTouch()) {
$this->rawUpdate([
$model->getUpdatedAtColumn() => $model->freshTimestampString(),
]);
}
}
/**
* Run a raw update against the base query.
*
* @param array $attributes
* @return int
*/
public function rawUpdate(array $attributes = [])
{
return $this->query->withoutGlobalScopes()->update($attributes);
}
/**
* Add the constraints for a relationship count query.
*
* @param \Illuminate\Database\Eloquent\Builder $query
* @param \Illuminate\Database\Eloquent\Builder $parentQuery
* @return \Illuminate\Database\Eloquent\Builder
*/
public function getRelationExistenceCountQuery(Builder $query, Builder $parentQuery)
{
return $this->getRelationExistenceQuery(
$query, $parentQuery, new Expression('count(*)')
)->setBindings([], 'select');
}
/**
* Add the constraints for an internal relationship existence query.
*
* Essentially, these queries compare on column names like whereColumn.
*
* @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 = ['*'])
{
return $query->select($columns)->whereColumn(
$this->getQualifiedParentKeyName(), '=', $this->getExistenceCompareKey()
);
}
/**
* Get all of the primary keys for an array of models.
*
* @param array $models
* @param string $key
* @return array
*/
protected function getKeys(array $models, $key = null)
{
return collect($models)->map(function ($value) use ($key) {
return $key ? $value->getAttribute($key) : $value->getKey();
})->values()->unique(null, true)->sort()->all();
}
/**
* Get the underlying query for the relation.
*
* @return \Illuminate\Database\Eloquent\Builder
*/
public function getQuery()
{
return $this->query;
}
/**
* Get the base query builder driving the Eloquent builder.
*
* @return \Illuminate\Database\Query\Builder
*/
public function getBaseQuery()
{
return $this->query->getQuery();
}
/**
* Get the parent model of the relation.
*
* @return \Illuminate\Database\Eloquent\Model
*/
public function getParent()
{
return $this->parent;
}
/**
* Get the fully qualified parent key name.
*
* @return string
*/
public function getQualifiedParentKeyName()
{
return $this->parent->getQualifiedKeyName();
}
/**
* Get the related model of the relation.
*
* @return \Illuminate\Database\Eloquent\Model
*/
public function getRelated()
{
return $this->related;
}
/**
* Get the name of the "created at" column.
*
* @return string
*/
public function createdAt()
{
return $this->parent->getCreatedAtColumn();
}
/**
* Get the name of the "updated at" column.
*
* @return string
*/
public function updatedAt()
{
return $this->parent->getUpdatedAtColumn();
}
/**
* Get the name of the related model's "updated at" column.
*
* @return string
*/
public function relatedUpdatedAt()
{
return $this->related->getUpdatedAtColumn();
}
/**
* Get the name of the "where in" method for eager loading.
*
* @param \Illuminate\Database\Eloquent\Model $model
* @param string $key
* @return string
*/
protected function whereInMethod(Model $model, $key)
{
return $model->getKeyName() === last(explode('.', $key))
&& $model->getIncrementing()
&& in_array($model->getKeyType(), ['int', 'integer'])
? 'whereIntegerInRaw'
: 'whereIn';
}
/**
* Set or get the morph map for polymorphic relations.
*
* @param array|null $map
* @param bool $merge
* @return array
*/
public static function morphMap(array $map = null, $merge = true)
{
$map = static::buildMorphMapFromModels($map);
if (is_array($map)) {
static::$morphMap = $merge && static::$morphMap
? $map + static::$morphMap : $map;
}
return static::$morphMap;
}
/**
* Builds a table-keyed array from model class names.
*
* @param string[]|null $models
* @return array|null
*/
protected static function buildMorphMapFromModels(array $models = null)
{
if (is_null($models) || Arr::isAssoc($models)) {
return $models;
}
return array_combine(array_map(function ($model) {
return (new $model)->getTable();
}, $models), $models);
}
/**
* Get the model associated with a custom polymorphic type.
*
* @param string $alias
* @return string|null
*/
public static function getMorphedModel($alias)
{
return self::$morphMap[$alias] ?? null;
}
/**
* Handle dynamic method calls to the relationship.
*
* @param string $method
* @param array $parameters
* @return mixed
*/
public function __call($method, $parameters)
{
if (static::hasMacro($method)) {
return $this->macroCall($method, $parameters);
}
$result = $this->forwardCallTo($this->query, $method, $parameters);
if ($result === $this->query) {
return $this;
}
return $result;
}
/**
* Force a clone of the underlying query builder when cloning.
*
* @return void
*/
public function __clone()
{
$this->query = clone $this->query;
}
}