javascript - Sequelize 模型与模型无关

Question

我一直在浪费时间。我有很多来源，它们都差不多，但我就是无法让我的项目发挥作用。

Sequelize.js - "is not associated to" 这个问题与我的非常相似，但是，我的这个问题不应该重复。因为它肯定有一个新问题!

列出我的资料来源，我已经仔细阅读并尝试过的资料:

Sequelize.js - "is not associated to"

Sequelize 4.3.2 n:m (many-to-many) association: Unhandled rejection SequelizeEagerLoadingError

Link to a book on Google

https://medium.com/@eth3rnit3/sequelize-relationships-ultimate-guide-f26801a75554

为了添加上下文，我试图提供一个让用户获取他们的个人资料的路线。每个用户只有一个 Angular 色。

像这样:

{
  id: 4,
  email: 'adsads@saas.com',
  role: {
     id: 2,
     name: 'admin'
  }
}

将 findOne 与 WHERE 和 INCLUDE 一起使用

exports.getme = (req, res) => {
  db.users.findOne({
    where: { id: req.user.id },
    include: [{
      model: db.roles,
    }]
  })  
  .then(data => {
    res.send(data)
  })
  .catch(err => {
    console.log(err)
    res.status(500).send({
      message: "An error has occured while retrieving data."
    })
  })
}

我得到的错误是:

Role is not associated to User!

这是模型，以及我如何放置它们各自的关联:

Angular 色.js

'use strict';
module.exports = (sequelize, DataTypes) => {
  const Role = sequelize.define('Role', {
    id: {
      type: DataTypes.INTEGER,
      allowNull: false,
      primaryKey: true,
      autoIncrement: true,
      field: "id"
    },
    role: DataTypes.STRING
  }, {
    timestamps: false
  });
  Role.associate = function (models) {
    Role.hasMany(models.User, {
      foreignKey: "roleId",
      sourceKey: "id"
    })
  }
  return Role;
};

User.js

'use strict';
module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define('User', {
    id: { type: DataTypes.BIGINT, allowNull: false, autoIncrement: true, unique: true, primaryKey: true },
    email: DataTypes.STRING,
  }, {});
  User.associate = function (models) {
    User.belongsTo(models.Role, { 
      foreignKey: "roleId", 
      targetKey: "id"
    });
  }
  return User
}

此外，当我检查我的表的 关系 时，我只能在我的 USER 表中看到详细信息，而在我的 ROLES 表中没有看到详细信息。




编辑:评论部分的 Anatoly 指出，当 db.users 启动时，findOne 似乎没有关联。以下是我在 server.js 中设置模型的方法:

....
const db = require("./app/models")

if (process.env.NODE_ENV === "production") {
  db.sequelize.sync().then(() => {
    useRoutes()
    seedDB()
  })
} else {
  db.sequelize.sync({ force: true }).then(() => {
    console.log("Drop and re-sync db.")
    useRoutes()
    seedDB()
  })
}

function useRoutes() {
  console.log("Use routes...")
  require("./app/routes/user/user.routes")(app)
  require("./app/routes/emojis/emojis.routes")(app)
  require("./app/routes/auth/auth.routes")(app)

  const db = require("./app/models")
  // Custom.
  db.op = db.Sequelize.Op
  // Models
  db.appsettings = require("./app/models/appsettings/appsettings.model")(db.sequelize, db.Sequelize)
  db.countries = require("./app/models/appsettings/country.model")(db.sequelize, db.Sequelize)

  db.users = require("./app/models/user/user.model")(db.sequelize, db.Sequelize)
  db.roles = require("./app/models/user/role.model")(db.sequelize, db.Sequelize)
  db.userscores = require("./app/models/user/userscore.model")(db.sequelize, db.Sequelize)

  db.answers = require("./app/models/game/answer.model")(db.sequelize, db.Sequelize)
  db.categories = require("./app/models/game/category.model")(db.sequelize, db.Sequelize)
  db.questions = require("./app/models/game/question.model")(db.sequelize, db.Sequelize)
  db.useracoomplishedquestions = require("./app/models/game/useracoomplishedquestion.model")(db.sequelize, db.Sequelize)
}

模型/index.js (由 Sequelize 生成，我对其进行了一些修改，并使用 glob 轻松扫描子文件夹)

'use strict';

const fs = require('fs');
const path = require('path');
const Sequelize = require('sequelize');
const basename = path.basename(__filename);
const env = process.env.NODE_ENV || 'development';
const config = require(__dirname + '/../config/config')[env];
const db = {};
const glob = require("glob")

let sequelize;
if (config.use_env_variable) {
  sequelize = new Sequelize(process.env[config.use_env_variable], config);
} else {
  sequelize = new Sequelize(config.database, config.username, config.password, config);
}

// Use glob to access model files inside subfolders.
const files = glob.sync(__dirname + "/*/*.js")

files.forEach(file => {
  const model = sequelize['import'](file);
  db[model.name] = model;
})

Object.keys(db).forEach(modelName => {
  if (db[modelName].associate) {
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

module.exports = db;

Answer 1

通过这段代码

// Models
  db.appsettings = require("./app/models/appsettings/appsettings.model")(db.sequelize, db.Sequelize)
  db.countries = require("./app/models/appsettings/country.model")(db.sequelize, db.Sequelize)

  db.users = require("./app/models/user/user.model")(db.sequelize, db.Sequelize)
  db.roles = require("./app/models/user/role.model")(db.sequelize, db.Sequelize)
  db.userscores = require("./app/models/user/userscore.model")(db.sequelize, db.Sequelize)

  db.answers = require("./app/models/game/answer.model")(db.sequelize, db.Sequelize)
  db.categories = require("./app/models/game/category.model")(db.sequelize, db.Sequelize)
  db.questions = require("./app/models/game/question.model")(db.sequelize, db.Sequelize)
  db.useracoomplishedquestions = require("./app/models/game/useracoomplishedquestion.model")(db.sequelize, db.Sequelize)

您覆盖了在 models/index.js 中注册的模型定义，这就是这些模型没有关联的原因。只需删除这些行。