我花了几个小时却毫无结果。我有很多资源，它们都有点相同，但我就是无法让我的项目发挥作用。
这个问题Sequelize.js - “不关联到” https://stackoverflow.com/questions/50841912/sequelize-js-is-not-associated-to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来源：
- Sequelize.js - “不关联到” https://stackoverflow.com/questions/50841912/sequelize-js-is-not-associated-to
- Sequelize 4.3.2 n:m（多对多）关联：未处理的拒绝 SequelizeEagerLoadingError https://stackoverflow.com/questions/45151194/sequelize-4-3-2-nm-many-to-many-association-unhandled-rejection-sequelizeeag
- https://medium.com/@eth3rnit3/sequelize-relationships-ultimate-guide-f26801a75554 https://medium.com/@eth3rnit3/sequelize-relationships-ultimate-guide-f26801a75554
为了添加上下文，我试图提供一条路线，让用户获取他们的个人资料。每个用户只有一个角色。
Like so:
{
id: 4,
email: 'a[email protected] /cdn-cgi/l/email-protection',
role: {
id: 2,
name: 'admin'
}
}
将 findOne 与 WHERE 和 INCLUDE 结合使用
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：
角色未与用户关联！
以下是模型，以及我如何表达它们各自的关联：
Role.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
}
另外，当我检查关系我的表格中，我只能看到我的详细信息USER表，但我的中没有ROLES table.
编辑：评论部分的阿纳托利指出，似乎db.users没有关联时findOne火了。这是我在我的模型中设置模型的方法server.js:
....
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;
