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<?php
namespace ipl\Orm\Relation;
use ipl\Orm\Model;
use ipl\Orm\Relation;
use ipl\Orm\Relations;
use LogicException;
use function ipl\Stdlib\get_php_type;
/**
* Many-to-many relationship
*/
class BelongsToMany extends Relation
{
/** @var string Relation class */
protected const RELATION_CLASS = HasMany::class;
protected $isOne = false;
/** @var string Name of the join table or junction model class */
protected $throughClass;
/** @var Model The junction model */
protected $through;
/** @var string|array Column name(s) of the target model's foreign key found in the join table */
protected $targetForeignKey;
/** @var string|array Candidate key column name(s) in the target table which references the target foreign key */
protected $targetCandidateKey;
/**
* Get the name of the join table or junction model class
*
* @return ?string
*/
public function getThroughClass(): ?string
{
return $this->throughClass;
}
/**
* Set the join table name or junction model class
*
* @param string $through
*
* @return $this
*/
public function through(string $through): self
{
$this->throughClass = $through;
return $this;
}
/**
* Get the junction model
*
* @return Model|Junction
*/
public function getThrough(): Model
{
if ($this->through === null) {
$throughClass = $this->getThroughClass();
if ($throughClass === null) {
throw new LogicException(
'You cannot use a many-to-many relation without a through class or a table name for the'
. ' junction model'
);
}
if (class_exists($throughClass)) {
$this->through = new $throughClass();
} else {
$this->through = (new Junction())
->setTableName($throughClass);
}
}
return $this->through;
}
/**
* Set the junction model
*
* @param Model $through
*
* @return $this
*/
public function setThrough(Model $through): self
{
$this->through = $through;
return $this;
}
/**
* Get the column name(s) of the target model's foreign key found in the join table
*
* @return string|array Array if the foreign key is compound, string otherwise
*/
public function getTargetForeignKey()
{
return $this->targetForeignKey;
}
/**
* Set the column name(s) of the target model's foreign key found in the join table
*
* @param string|array $targetForeignKey Array if the foreign key is compound, string otherwise
*
* @return $this
*/
public function setTargetForeignKey($targetForeignKey): self
{
$this->targetForeignKey = $targetForeignKey;
return $this;
}
/**
* Get the candidate key column name(s) in the target table which references the target foreign key
*
* @return string|array Array if the foreign key is compound, string otherwise
*/
public function getTargetCandidateKey()
{
return $this->targetCandidateKey;
}
/**
* Set the candidate key column name(s) in the target table which references the target foreign key
*
* @param string|array $targetCandidateKey Array if the foreign key is compound, string otherwise
*
* @return $this
*/
public function setTargetCandidateKey($targetCandidateKey): self
{
$this->targetCandidateKey = $targetCandidateKey;
return $this;
}
public function resolve()
{
$source = $this->getSource();
$possibleCandidateKey = [$this->getCandidateKey()];
$possibleForeignKey = [$this->getForeignKey()];
$target = $this->getTarget();
$possibleTargetCandidateKey = [$this->getTargetForeignKey() ?: static::getDefaultForeignKey($target)];
$possibleTargetForeignKey = [$this->getTargetCandidateKey() ?: static::getDefaultCandidateKey($target)];
$junction = $this->getThrough();
if (! $junction instanceof Junction) {
$relations = new Relations();
$junction->createRelations($relations);
if ($relations->has($source->getTableAlias())) {
$sourceRelation = $relations->get($source->getTableAlias());
$possibleCandidateKey[] = $sourceRelation->getForeignKey();
$possibleForeignKey[] = $sourceRelation->getCandidateKey();
}
if ($relations->has($target->getTableAlias())) {
$targetRelation = $relations->get($target->getTableAlias());
$possibleTargetCandidateKey[] = $targetRelation->getCandidateKey();
$possibleTargetForeignKey[] = $targetRelation->getForeignKey();
}
}
$junctionClass = static::RELATION_CLASS;
$toJunction = (new $junctionClass())
->setName($junction->getTableAlias())
->setSource($source)
->setTarget($junction)
->setCandidateKey($this->extractKey($possibleCandidateKey))
->setForeignKey($this->extractKey($possibleForeignKey));
$targetClass = static::RELATION_CLASS;
$toTarget = (new $targetClass())
->setName($this->getName())
->setSource($junction)
->setTarget($target)
->setCandidateKey($this->extractKey($possibleTargetCandidateKey))
->setForeignKey($this->extractKey($possibleTargetForeignKey));
foreach ($toJunction->resolve() as $k => $v) {
yield $k => $v;
}
foreach ($toTarget->resolve() as $k => $v) {
yield $k => $v;
}
}
protected function extractKey(array $possibleKey)
{
$filtered = array_filter($possibleKey);
return array_pop($filtered);
}
}
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