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<?php |
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namespace Staudenmeir\LaravelAdjacencyList\Eloquent\Relations\Traits\Concatenation; |
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use Illuminate\Database\Eloquent\Builder; |
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use Illuminate\Database\Eloquent\Collection; |
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use Illuminate\Database\PostgresConnection; |
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use RuntimeException; |
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trait IsConcatenableRelation |
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{ |
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/** |
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* Append the relation's through parents, foreign and local keys to a deep relationship. |
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* |
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* @param \Illuminate\Database\Eloquent\Model[] $through |
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* @param array $foreignKeys |
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* @param array $localKeys |
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* @param int $position |
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* @return array |
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*/ |
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public function appendToDeepRelationship(array $through, array $foreignKeys, array $localKeys, int $position): array |
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{ |
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if ($position === 0) { |
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$foreignKeys[] = function (Builder $query, Builder $parentQuery = null) { |
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if ($parentQuery) { |
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$this->getRelationExistenceQuery($this->query, $parentQuery); |
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} |
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$this->mergeExpressions($query, $this->query); |
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}; |
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$localKeys[] = null; |
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} else { |
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throw new RuntimeException( |
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sprintf( |
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'%s can only be at the beginning of deep relationships at the moment.', |
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class_basename($this) |
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) |
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); |
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} |
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return [$through, $foreignKeys, $localKeys]; |
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} |
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/** |
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* Get the related table name for a deep relationship. |
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* |
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* @return string |
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*/ |
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public function getTableForDeepRelationship(): string |
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{ |
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return $this->related->getExpressionName(); |
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} |
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/** |
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* The custom callback to run at the end of the get() method. |
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* |
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* @param \Illuminate\Database\Eloquent\Collection $models |
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* @return void |
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*/ |
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public function postGetCallback(Collection $models): void |
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{ |
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if (!$this->query->getConnection() instanceof PostgresConnection) { |
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return; |
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} |
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if (!isset($models[0]->laravel_through_key)) { |
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return; |
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} |
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$this->replacePathSeparator( |
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$models, |
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'laravel_through_key', |
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$this->related->getPathSeparator() |
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); |
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} |
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/** |
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* Replace the separator in a PostgreSQL path column. |
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* |
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* @param \Illuminate\Database\Eloquent\Collection $models |
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* @param string $column |
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* @param string $separator |
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* @return void |
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*/ |
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protected function replacePathSeparator(Collection $models, string $column, string $separator): void |
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{ |
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foreach ($models as $model) { |
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$model->$column = str_replace( |
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',', |
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$separator, |
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substr($model->$column, 1, -1) |
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); |
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} |
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} |
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/** |
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* Get the custom through key for an eager load of the relation. |
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* |
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* @param string $alias |
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* @return string |
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*/ |
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public function getThroughKeyForDeepRelationships(string $alias): string |
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{ |
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$throughKey = $this->related->qualifyColumn( |
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$this->related->getPathName() |
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); |
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return "$throughKey as $alias"; |
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} |
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/** |
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* Merge the common table expressions from one query into another. |
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* |
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* @param \Illuminate\Database\Eloquent\Builder $query |
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* @param \Illuminate\Database\Eloquent\Builder $from |
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* @return \Illuminate\Database\Eloquent\Builder |
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*/ |
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protected function mergeExpressions(Builder $query, Builder $from): Builder |
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{ |
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$query->getQuery()->expressions = array_merge( |
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$query->getQuery()->expressions, |
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$from->getQuery()->expressions |
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); |
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return $query->addBinding( |
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$from->getQuery()->getRawBindings()['expressions'], |
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'expressions' |
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); |
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} |
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} |
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staudenmeir /
laravel-adjacency-list
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