{
    //rdbms:server type, postgresql 
    "rdbms":"postgresql",
    //host:server address,localhost by default;
    "host":"127.0.0.1",
    //port:server port, 5432 by default;
    "port":5432,
    //dbname:Database name;
    "dbname":"postgres",
    "user":"postgres",
    "passwd":"",
    //"tables":["group_users"]
    "tables": [
        "users",
        "wallets",
        "blog",
        "category",
        "blog_tag",
        "tag"
    ],
    "relationships": {
        "enabled": true,
        "items": [
            {
                "type": "has one",
                "original_table_name": "users",
                "original_table_alias": "user",
                "original_key": "user_id",
                "target_table_name": "wallets",
                "target_table_alias": "wallet",
                "target_key": "user_id",
                "enable_reverse": true
            },
            {
                "type": "has many",
                "original_table_name": "category",
                "original_table_alias": "category",
                "original_key": "id",
                "target_table_name": "blog",
                "target_table_alias": "blogs",
                "target_key": "category_id",
                "enable_reverse": true
            },
            {
                "type": "many to many",
                "original_table_name": "blog",
                "original_table_alias": "blogs",
                "original_key": "id",
                "pivot_table": {
                    "table_name": "blog_tag",
                    "original_key": "blog_id",
                    "target_key": "tag_id"
                },
                "target_table_name": "tag",
                "target_table_alias": "tags",
                "target_key": "id",
                "enable_reverse": true
            }
        ]
    }
}