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<?php namespace Kalnoy\Nestedset; use Illuminate\Database\Eloquent\Builder as EloquentBuilder; use Illuminate\Database\Eloquent\Model; class DescendantsRelation extends BaseRelation { /** * Set the base constraints on the relation query. * * @return void */ public function addConstraints() { if ( ! static::$constraints) return; $this->query->whereDescendantOf($this->parent) ->applyNestedSetScope(); } /** * @param QueryBuilder $query * @param Model $model */ protected function addEagerConstraint($query, $model) { $query->orWhereDescendantOf($model); } /** * @param Model $model * @param $related * * @return mixed */ protected function matches(Model $model, $related) { return $related->isDescendantOf($model); } /** * @param $hash * @param $table * @param $lft * @param $rgt * * @return string */ protected function relationExistenceCondition($hash, $table, $lft, $rgt) { return "{$hash}.{$lft} between {$table}.{$lft} + 1 and {$table}.{$rgt}"; } }