Sequelize - 自定义创建方法

Question

是否有可能在Sequelize中创建自定义create方法。我希望它能传递一个URL来下载缩略图照片，然后用这些数据调用一个方法来下载照片，上传到S3，并将该S3 URL保存为thumbnailPhotoURL。

下面是语法，我试图做的一个例子：

var Sequelize = require('sequelize'); 
var sequelize = new Sequelize('database', 'username', 'password'); 

var User = sequelize.define('user', { 
    username: Sequelize.STRING, 
    birthday: Sequelize.DATE, 
    thumbnailPhotoURL: Sequelize.STRING 
}); 

sequelize.sync().then(function() { 
    return User.create({ 
    username: 'janedoe', 
    birthday: new Date(1980, 6, 20), 
    // this will be used to download and upload the thumbnailPhoto to S3 
    urlToDownloadThumbnailPhotoFrom: 'http://example.com/test.png' 
    }); 
}).then(function(jane) { 
    console.log(jane.get({ 
    plain: true 
    })); 
}); 

通知我如何我打电话User.create与urlToDownloadThumbnailPhotoFrom参数，而不是thumbnailPhotoURL参数

Answer 1

您可以使用前创建钩子无需定义自定义创建功能

var Sequelize = require('sequelize'); 
var sequelize = new Sequelize('database', 'username', 'password'); 

var User = sequelize.define('user', { 
    username: Sequelize.STRING, 
    birthday: Sequelize.DATE, 
    thumbnailPhotoURL: Sequelize.STRING 
}); 


User.beforeCreate(function(model, options, cb) { 
    var urlToDownloadThumbnailPhotoFrom = model.urlToDownloadThumbnailPhotoFrom; 


//.....Here you write the logic to get s3 url using urlToDownloadThumbnailPhotoFrom and then assign it to model and call the call back it will automatically get saved 

    model.thumbnailPhotoURL = thumbnailPhotoURL; 
    cb(); 
});