src/db/JoinClause.class.php
public function whereIn($column, array $values, $boolean = 'and', $not = false) {
		$in = $not ? 'not in' : 'in';
		
		return $this->on($column, $in, $values, $boolean, true);
	}
public function whereIn($column, array $values, $boolean = 'and', $not = false) {
		$in = $not ? 'not in' : 'in';
		
		return $this->on($column, $in, $values, $boolean, true);
	}
Add an "on where in (...)" clause to the join.

@param  string  $column
@param  array  $values
@return \Illuminate\Database\Query\JoinClause