我正在开发应用程序,但是我在使用Node.js和Sequelize for Postgresql时遇到了这个问题:
throw new Error(this.name + '.' + Utils.lowercaseFirst(Type.toString()) + ' called with something that\'s not a subclass of Sequelize.Model');
^
Error: Expense.class BelongsTo extends Association {
constructor(source, target, options) {
super(source, target, options);
<....LOT OF CODE FROM SEQUELIZE ....>
if ((fieldsOrOptions || {}).transaction instanceof Transaction) {
options.transaction = fieldsOrOptions.transaction;
}
options.logging = (fieldsOrOptions || {}).logging;
return association.target.create(values, fieldsOrOptions).then(newAssociatedObject =>
sourceInstance[association.accessors.set](newAssociatedObject, options)
);
}
} called with something that's not a subclass of Sequelize.Model
我不明白这个错误,尤其是最后一行“使用不是Sequelize.Model的子类的东西调用”。 以下是模型:
用户模型
const models = require('./index');
const Expense = models.User;
module.exports = (sequelize, DataTypes) => {
var User = sequelize.define('User', {
firstname: DataTypes.STRING,
lastname: DataTypes.STRING,
email: DataTypes.STRING,
password: DataTypes.STRING
}, {
classMethods: {
associate: function(models) {
User.hasMany(models.Expense);
}
}
});
console.log(models);
User.hasMany(Expense, {as: 'Expenses', foreignKey: 'userId'});
return User;
};
费用模型
const models = require('./index');
const User = models.User;
module.exports = (sequelize, DataTypes) => {
var Expense = sequelize.define('Expense', {
name: DataTypes.STRING,
amount: DataTypes.INTEGER,
date: DataTypes.INTEGER
}, {
classMethods: {
}
});
Expense.belongsTo(User, { foreignKey: 'userId' });
return Expense;
};
用于创建费用的控制器:
createExpense: function(req, res) {
const user = User.findOne({ where: { id: req.params.id } });
Expense.create({
name: req.body.name,
amount: req.body.amount,
date: req.body.date,
User: user
},{
include: [
{
model: User
}
]
}).then((created) => {
res.status(200).send({ success: true, message: 'Dépense ajoutée !' });
});
}
是否有人看到过这样的错误?我搜索了几天没有任何问题,如果有人可以帮助我会非常感激,
谢谢!
答案 0 :(得分:0)
我之前也遇到过同样的问题,但是找到了原因。关键是您的模型必须在相同的sequelize类下。
您可以在github上查看我的项目mini-shop。
答案 1 :(得分:0)
尽管迟到了3年...我认为,这是由于进口不良造成的。在“用户模型”中的“费用模型”中的导入使用此行,看起来有点腥:
const Expense = models.User;
但是从相当普遍的角度来看,这种错误消息可能是在诸如User.hasMany(Expense, {as: 'Expenses', foreignKey: 'userId'});
这样的行中创建关联时提示错误的提示
这里是another answer,涉及一个类似的问题。例如,在我的情况下,错误是由于未使用定义名称访问我的模型而引起的(<-取决于您的设置!)