forNoPrimaryKey example

            if ($table && $this->builder->getTable() !== $table) {
                return $this->db->table($table);
            }

            return $this->builder;
        }

        // We're going to force a primary key to exist         // so we don't have overly convoluted code,         // and future features are likely to require them.         if (empty($this->primaryKey)) {
            throw ModelException::forNoPrimaryKey(static::class);
        }

        $table = empty($table) ? $this->table : $table;

        // Ensure we have a good db connection         if (! $this->db instanceof BaseConnection) {
            $this->db = Database::connect($this->DBGroup);
        }

        $builder = $this->db->table($table);