未定义sequelize - Sequelize并寄存

Question

我是node的新手。

我正在尝试用cosign在我的简单应用程序中添加Sequelize。

config/db.js

var Sequelize = require('sequelize');

var sequelize = new Sequelize('test', 'root', '', {

host: 'localhost',
dialect: 'mysql',

 pool: {
max: 5,
min: 0,
idle: 10000
}

});

module.exports = function () {
return sequelize
}

model/user.js

var Sequelize = require('sequelize');

module.exports = function(application, req, res){

var User = sequelize.define('user', {
username: {
type: Sequelize.STRING,
}
}, {
freezeTableName: true // Model tableName will be the same as the model name
});

User.create({ username: 'fnord'})
.then(function() {
console.log('criado!');
})
}

config/server.js

...
consign()
.include('app/routes')
.then('config/db.js')
.then('app/models')
.then('app/controllers')
.into(app);

module.exports = app;

我收到错误用户varsequelize is not defined´ on= sequelize.define(' User '，{`

我哪里做错了？

Answer 1

在moldes文件夹中创建一个index.js文件，如下所示：

"use strict";

var fs        = require("fs");
var path      = require("path");
var Sequelize = require("sequelize");

var sequelize = new Sequelize(global.config.dbConfig.name, global.config.dbConfig.user, global.config.dbConfig.password, {
  host: global.config.dbConfig.host,
  port: global.config.dbConfig.port,
  pool: false
});

var db = {};

fs.readdirSync(__dirname)
  .filter(function(file) {
    return (file.indexOf(".") !== 0) && (file !== "index.js");
  })
  .forEach(function(file) {
    var model = sequelize.import(path.join(__dirname, file));
    db[model.name] = model;
  });

Object.keys(db).forEach(function(modelName) {
  if ("associate" in db[modelName]) {
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;

module.exports = db;

在你的user.js中做一些类似这样的事情：

module.exports = function(sequelize, DataTypes) {
  var User = sequelize.define("User", {
    username: {
      type: DataTypes.STRING
    }, 
    {
      freezeTableName: true // Model tableName will be the same as the model name 
    }
  });

  return User;
}

http://docs.sequelizejs.com/en/1.7.0/articles/express/

Answer 2

您应该要求将实例序列化为用户模型

config/db.js

module.exports = sequelize;

model/user.js

var Sequelize = require('sequelize');
var sequelize = require('../config/db.js'); //sequelize instance

module.exports = function(application, req, res){

var User = sequelize.define('user', { 
...

Answer 3

Sequelize-CLI对于使用Sequelize的项目来说是一个非常有用的工具。当你下载的时候

npm install -g sequelize-cli

然后，您可以运行

sequelize init

上面的命令将为您写出一些文件夹，其中包括一个包含Ricardo在上面创建的索引文件的models文件夹。这也提供了一些非常酷的环境配置。在新的models文件夹中，您可以使用以下语法创建一个包含对象的新文件...

module.exports = function(sequelize, DataTypes) {
  var User = sequelize.define("User", {
    username: {
      type: DataTypes.STRING
    }, 
    {
      freezeTableName: true // Model tableName will be the same as the model name 
    }
  });

  return User;
}

虽然我喜欢它作为一种工具。这里需要注意的是，Sequelize将查找define()方法的第一个参数。所以我们可以直接写

module.exports = function(sequelize, DataType){
return sequelize.define("User", {
    username: {
      type: DataTypes.STRING
    }, 
    {
      freezeTableName: true // Model tableName will be the same as the model name 
    }
  });