Sequelize 如何仅返回数据库结果的 JSON 对象

所以我只想返回数据库结果，别的什么都不想.目前，我收到了一大块JSON数据(如下所示):

But I'm only needing the [dataValues] attribute. I don't want to have to use the this bit of JSON to retrieve it: tagData[0].dataValues.tagId.

I just noticed: When it finds and DOESN'T CREATE, it will return the JSON for the database results, but when it DOESN'T FIND and creates, it returns the un-needed JSON blob (Like below) Is there a way around this?

[ { dataValues:
     { tagId: 1,
       tagName: '#hash',
       updatedAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT),
       createdAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT) },
    _previousDataValues:
     { tagId: 1,
       tagName: '#hash',
       createdAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT),
       updatedAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT) },
    _changed:
     { tagId: false,
       tagName: false,
       createdAt: false,
       updatedAt: false },
    '$modelOptions':
     { timestamps: true,
       instanceMethods: {},
       classMethods: {},
       validate: {},
       freezeTableName: true,
       underscored: false,
       underscoredAll: false,
       paranoid: false,
       whereCollection: [Object],
       schema: null,
       schemaDelimiter: '',
       defaultScope: null,
       scopes: [],
       hooks: {},
       indexes: [],
       name: [Object],
       omitNull: false,
       sequelize: [Object],
       uniqueKeys: [Object],
       hasPrimaryKeys: true },
    '$options':
     { isNewRecord: true,
       '$schema': null,
       '$schemaDelimiter': '',
       attributes: undefined,
       include: undefined,
       raw: true,
       silent: undefined },
    hasPrimaryKeys: true,
    __eagerlyLoadedAssociations: [],
    isNewRecord: false },
  true ]

Instead of getting the big blob like the above I only need the RAW json results (Like below):

{ tagId: 1,
       tagName: '#hash',
       updatedAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT),
       createdAt: Fri Dec 25 2015 17:07:13 GMT+1100 (AEDT) },

我使用了以下javascript.我试过加raw: true，但没用？

    // Find or create new tag (hashtag), then insert it into DB with photoId relation
module.exports = function(tag, photoId) {
    tags.findOrCreate( { 
        where: { tagName: tag },
        raw: true
    })
    .then(function(tagData){
        // console.log("----------------> ", tagData[0].dataValues.tagId);
        console.log(tagData);
        tagsRelation.create({ tagId: tagData[0].dataValues.tagId, photoId: photoId })
        .then(function(hashtag){
            // console.log("\nHashtag has been inserted into DB: ", hashtag);
        }).catch(function(err){
            console.log("\nError inserting tags and relation: ", err);
        });
    }).catch(function(err){
        if(err){
            console.log(err);
        }
    });

}

编辑:

So I've investigated a bit and it seems that the big JSON blob is only returned when Sequelize is creating and not finding.

有没有办法绕过这件事？

Edit 2:

Okay so I've found a workaround, which could be turned into a re-usable function. But if there's something built into Sequelize, I'd prefer to use that.

var tagId = "";

// Extract tagId from json blob
if(tagData[0].hasOwnProperty('dataValues')){
    console.log("1");
    tagId = tagData[0].dataValues.tagId;
} else {
    console.log("2");
    console.log(tagData);
    tagId = tagData[0].tagId;
}

console.log(tagId);
tagsRelation.create({ tagId: tagId, photoId: photoId })

Edit 3:

So, I don't think there is an "Official" sequelize way of achieving this so I simply wrote a custom module which returns the JSON data that's needed. This module can be customised and extended to suit various situations! If anyone has any suggestions to how the module can be improved feel free to comment :)

In this module we're returning a Javascript Object. If you want to turn it into JSON just stringify it using JSON.stringify(data).

// Pass in your sequelize JSON object
module.exports = function(json){ 
    var returnedJson = []; // This will be the object we return
    json = JSON.parse(json);


    // Extract the JSON we need 
    if(json[0].hasOwnProperty('dataValues')){
        console.log("HI: " + json[0].dataValues);
        returnedJson = json[0].dataValues; // This must be an INSERT...so dig deeper into the JSON object
    } else {
        console.log(json[0]);
        returnedJson = json[0]; // This is a find...so the JSON exists here
    }

    return returnedJson; // Finally return the json object so it can be used
}

编辑4:

So there is an official sequelize method. Refer to the accepted answer below.