Sequelize associations - please use promise-style instead

问题

I'm trying to join 3 tables together Products, Suppliers and Categories and then get row with SupplierID = 13. I have read How to implement many to many association in sequelize, there is explained how to associate 0:M.

DB model:

Code:

var Sequelize = require('sequelize')
var sequelize = new Sequelize('northwind', 'nodejs', 'nodejs', {dialect: 'mysql',})
var Project = require('sequelize-import')(__dirname + '/models', sequelize, { exclude: ['index.js'] });

Project.Suppliers.hasMany(Project.Products, {foreignKey: 'SupplierID'});
Project.Products.belongsTo(Project.Suppliers, {foreignKey: 'SupplierID'});
Project.Categories.hasMany(Project.Products, {foreignKey: 'CategoryID'});
Project.Products.belongsTo(Project.Categories, {foreignKey: 'CategoryID'});

Project.Products
    .find({
        where: {
            SupplierID: 13
        },
        include: [
            Project.Suppliers,
            Project.Category,
        ]
    })
    .success(function(qr){
        if (qr == null) throw "Err";

        console.log("---");
        console.log(qr);
    })
    .error(function(err){
        console.log("Err");
    });

Log:

    EventEmitter#success|ok is deprecated, please use promise-style instead.
    EventEmitter#failure|fail|error is deprecated, please use promise-style instead.
    Err

回答1:

Update: 15 Jan 15 - added .finally() handler. Also indicated how .then() is being fed with an argument from the previous handler and how to perform the next sequenced query.

The .success, .error and .done handlers are deprecated. The errors are not critical and it is likely that backwards compatibility will be maintained on them. But you should still change it.

As per promise A specs: http://wiki.commonjs.org/wiki/Promises/A

You now should do the following style:

db.Model.find(something)
  .then(function(results) {
      //do something with results
      //you can also take the results to make another query and return the promise.
      return db.anotherModel.find(results[0].anotherModelId);          
  }).then(function(results) {
      //do something else
  }).catch(function(err) {
      console.log(err);
  }).finally(function() {
        // finally gets called always regardless of 
        // whether the promises resolved with or without errors.
        // however this handler does receive any arguments.
  });

In short:

Use .then instead of .success

Use .catch instead of .error

Use .finally instead of .done *note: .finally will always get called regardless.

回答2:

i had the same issue with you, you can change .success and .error with single .done(function(err, result)) to do both operation and the warning message disappear too.

来源：https://stackoverflow.com/questions/26817057/sequelize-associations-please-use-promise-style-instead

标签

javascript

node.js

orm

sequelize.js