src/Rentgen/Database/Constraint/ForeignKey.php
public function setReferencedColumns($columns)
    {
        if (!is_array($columns)) {
            $columns = array($columns);
        }
        $this->referencedColumns = $columns;

        return $this;
    }
public function setReferencedColumns($columns)
    {
        if (!is_array($columns)) {
            $columns = array($columns);
        }
        $this->referencedColumns = $columns;

        return $this;
    }
Sets foreign key reference columns.

@param array $columns Columns list.

@return ForeignKey Self instance.