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<?php
namespace Illuminate\Validation\Rules;
use Closure;
class Exists
{
/**
* The table to run the query against.
*
* @var string
*/
protected $table;
/**
* The column to check for existence on.
*
* @var string
*/
protected $column;
/**
* There extra where clauses for the query.
*
* @var array
*/
protected $wheres = [];
/**
* The custom query callback.
*
* @var \Closure|null
*/
protected $using;
/**
* Create a new exists rule instance.
*
* @param string $table
* @param string $column
* @return void
*/
public function __construct($table, $column = 'NULL')
{
$this->table = $table;
$this->column = $column;
}
/**
* Set a "where" constraint on the query.
*
* @param string $column
* @param string $value
* @return $this
*/
public function where($column, $value = null)
{
if ($column instanceof Closure) {
return $this->using($column);
}
$this->wheres[] = compact('column', 'value');
return $this;
}
/**
* Set a "where not" constraint on the query.
*
* @param string $column
* @param string $value
* @return $this
*/
public function whereNot($column, $value)
{
return $this->where($column, '!'.$value);
}
/**
* Set a "where null" constraint on the query.
*
* @param string $column
* @return $this
*/
public function whereNull($column)
{
return $this->where($column, 'NULL');
}
/**
* Set a "where not null" constraint on the query.
*
* @param string $column
* @return $this
*/
public function whereNotNull($column)
{
return $this->where($column, 'NOT_NULL');
}
/**
* Register a custom query callback.
*
* @param \Closure $callback
* @return $this
*/
public function using(Closure $callback)
{
$this->using = $callback;
return $this;
}
/**
* Format the where clauses.
*
* @return string
*/
protected function formatWheres()
{
return collect($this->wheres)->map(function ($where) {
return $where['column'].','.$where['value'];
})->implode(',');
}
/**
* Get the custom query callbacks for the rule.
*
* @return array
*/
public function queryCallbacks()
{
return $this->using ? [$this->using] : [];
}
/**
* Convert the rule to a validation string.
*
* @return string
*/
public function __toString()
{
return rtrim(sprintf('exists:%s,%s,%s',
$this->table,
$this->column,
$this->formatWheres()
), ',');
}
}
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