addKey example

$this->forge->addField([
            'name'       => ['type' => 'varchar', 'constraint' => 31],
            'uid'        => ['type' => 'varchar', 'constraint' => 31],
            'class'      => ['type' => 'varchar', 'constraint' => 63],
            'icon'       => ['type' => 'varchar', 'constraint' => 31],
            'summary'    => ['type' => 'varchar', 'constraint' => 255],
            'created_at' => ['type' => 'datetime', 'null' => true],
            'updated_at' => ['type' => 'datetime', 'null' => true],
            'deleted_at' => ['type' => 'datetime', 'null' => true],
        ]);

        $this->forge->addKey('name');
        $this->forge->addKey('uid');
        $this->forge->addKey(['deleted_at', 'id']);
        $this->forge->addKey('created_at');

        $this->forge->createTable('factories');
    }

    public function down()
    {
        $this->forge->dropTable('factories');
    }
}

foreach ($this->keys as $keyName => $key) {
                switch ($key['type']) {
                    case 'primary':
                        $this->forge->addPrimaryKey($key['fields']);
                        break;

                    case 'unique':
                        $this->forge->addUniqueKey($key['fields'], $keyName);
                        break;

                    case 'index':
                        $this->forge->addKey($key['fields'], false, false, $keyName);
                        break;
                }
            }
        }

        foreach ($this->foreignKeys as $foreignKey) {
            $this->forge->addForeignKey(
                $foreignKey->column_name,
                trim($foreignKey->foreign_table_name, $this->db->DBPrefix),
                $foreignKey->foreign_column_name
            );
        }

    /** * Add Primary Key * * @param array|string $key * * @return Forge */
    public function addPrimaryKey($key, string $keyName = '')
    {
        return $this->addKey($key, true, false, $keyName);
    }

    /** * Add Unique Key * * @param array|string $key * * @return Forge */
    public function addUniqueKey($key, string $keyName = '')
    {