Question

我正在尝试联合查询，因为sequelize不支持它，我也想在 sequelize 和 postgresdb 的自定义查询中添加两个自定义/虚拟字段。如果删除自定义/虚拟字段，则查询有效，如果在选项对象上设置hasJoin:false，查询也将起作用，但字段在返回的对象上分散。

型号：

Post.define('posts', {
    "name": { "type": Types.STRING(250), "allowNull": true },
    "customField1": {
        type: Types.VIRTUAL,
        get: function () { return this.setDataValue('"customField1"'); },
    },
    "customField2": {
        type: Types.VIRTUAL,
        get: function () { return this.setDataValue('"customField2"'); },
    }
});

查询：

const options = {
    hasJoin: true,
    replacements: [UserID, UserID, limit, offset],
    type: sequelize.QueryTypes.SELECT,
    model: models.Posts,
    include: [
        { model: models.Users },
    ]
};

const queryString = 'SELECT "post"."ID","post"."createdAt", "post"."name", "user"."username" AS "user.username", "user"."email" AS "user.email",  \'false\' as customField1,  \'true\' as customField2 FROM "post" LEFT OUTER JOIN "users" AS "user" ON "post"."UserID" = "user"."ID" WHERE "post"."UserID" IN ( SELECT "followID" FROM "followers" WHERE "UserID" = ? ) GROUP BY "post"."ID", "user"."ID" UNION SELECT "post"."ID","post"."createdAt", "post"."name", "user"."username" AS "user.username", "user"."email" AS "user.email",  \'true\' as customField1,  \'false\' as customField2 FROM "post" LEFT OUTER JOIN "users" AS "user" ON "post"."UserID" = "user"."ID"  WHERE "post"."tags" && array(SELECT hashtag::text FROM "followedHashtags" WHERE "UserID" =  ? ) GROUP BY "post"."ID", "user"."ID" ORDER BY "createdAt" DESC LIMIT ? OFFSET  ? ';


sequelize.Model.$valIDateIncludedElements(options);

posts = await sequelize.query(queryString, options);

如果将hasJoin设置为false，我将得到类似的对象：

[
    {
        "id": 6,
        "name": "new post",
        "createdAt": "2018-07-06T02:22:13.188Z",
        "userId": 4,
        "user.id": 4,
        "user.name": "Mas",
        "user.surname": "Blazi",
        "user.username": "mas",
        "user.email": "bettyblaz2i@email.org",
        "customField1": "true",
        "customField2": "false"
    }
]

因此，当我将hasJoin设置为true并删除自定义字段时，用户对象不会像原来那样组合。

[

        {
            "id": 6,
            "name": "new post",
            "createdAt": "2018-07-06T02:22:13.188Z",
            "userId": 4,
            "user":{
                "id": 4,
                "name": "Mas",
                "surname": "Blazi",
                "username": "mas",
                "email": "bettyblaz2i@email.org"
            }

        }
    ]

在自定义查询中序列化虚拟字段

0 个答案: