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<?php |
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namespace Staudenmeir\LaravelAdjacencyList\Query\Grammars; |
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use Illuminate\Database\Query\Builder; |
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use Illuminate\Database\Query\Grammars\PostgresGrammar as Base; |
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class PostgresGrammar extends Base implements ExpressionGrammar |
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{ |
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/** |
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* Compile an initial path. |
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* |
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* @param string $column |
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* @param string $alias |
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* @return string |
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*/ |
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public function compileInitialPath($column, $alias) |
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{ |
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return 'array[('.$this->wrap($column)." || '')::varchar] as ".$this->wrap($alias); |
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} |
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/** |
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* Compile a recursive path. |
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* |
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* @param string $column |
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* @param string $alias |
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* @return string |
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*/ |
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public function compileRecursivePath($column, $alias) |
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{ |
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return $this->wrap($alias).' || '.$this->wrap($column).'::varchar'; |
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} |
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/** |
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* Get the recursive path bindings. |
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* |
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* @param string $separator |
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* @return array |
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*/ |
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public function getRecursivePathBindings($separator) |
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{ |
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return []; |
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} |
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/** |
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* Select a concatenated list of paths. |
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* |
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* @param \Illuminate\Database\Query\Builder $query |
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* @param string $expression |
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* @param string $column |
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* @param string $pathSeparator |
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* @param string $listSeparator |
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* @return \Illuminate\Database\Query\Builder |
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*/ |
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public function selectPathList(Builder $query, $expression, $column, $pathSeparator, $listSeparator) |
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{ |
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return $query->selectRaw( |
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'string_agg(array_to_string('.$this->wrap($column).', ?), ?)', |
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[$pathSeparator, $listSeparator] |
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)->from($expression); |
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} |
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} |
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staudenmeir /
laravel-adjacency-list
