Phactory\Sql\Association\ManyToOne::_guessFromColumn PHP Method

    protected function _guessFromColumn()
    {
        if (null === $this->_from_column) {
            $guess = $this->_to_table->getSingularName() . '_id';
            if ($this->_from_table->hasColumn($guess)) {
                $this->setFromColumn($guess);
            } else {
                throw new \Exception("Unable to guess from_column for association and none specified");
            }
        }
    }