Question

我有3个模型：User，Project，UserProject：

module.exports = function (sequelize, DataTypes) {
  var User = sequelize.define('User', {
  title: DataTypes.STRING,
  description: DataTypes.STRING
}, {
  classMethods: {
    associate: function (models) {
      User.belongsToMany(models.Project, { 
        through: 'UserProject',
        foreignKey: 'userId'
      })
    }
  },
  freezeTableName: true
})
  return User
}


module.exports = function (sequelize, DataTypes) {
  var Project = sequelize.define('Project', {
  title: DataTypes.STRING,
  description: DataTypes.STRING
  }, {
  classMethods: {
    associate: function (models) {
      Project.belongsToMany(models.User, { 
        through: 'UserProject',
        foreignKey: 'projectId'
      })
    }
  },
  freezeTableName: true
})
  return Project
}


module.exports = function (sequelize, DataTypes) {
 var UserProject = sequelize.define('UserProject', {
  userId: DataTypes.INTEGER,
  projectId: DataTypes.INTEGER,
 }, {
  classMethods: {
 },
  freezeTableName: true
 })
  return UserProject
}

上面的代码与Sequelize的旧版本完美配合。现在我更新到Sequelize 4.3.2并且在尝试使用这些模型时出现以下错误：

未处理拒绝SequelizeEagerLoadingError：项目未与用户关联！

这有什么问题？我尝试在这里进行多对多关联，并在findAll Projects中包含用户，反之亦然。我使用MySQL作为数据库。

这是findAll-part：

function getUsersWithProjects (request, response, next) {
  models.User.findAll({
    include: [{
      model: models.Project,
    }]
  });
}

Answer 1

现在我找到了解决方案。显然他们已经删除了classMethods和instanceMethods，所以关联现在定义如下：

module.exports = function (sequelize, DataTypes) {
  var User = sequelize.define('User', {
    title: DataTypes.STRING,
    description: DataTypes.STRING
  }, {
   freezeTableName: true
  })
  User.associate = function (models) {
   User.belongsToMany(models.Project, { 
    through: 'UserProject',
    foreignKey: 'userId'
   })
 };
 return User
}

来源：http://docs.sequelizejs.com/manual/tutorial/upgrade-to-v4.html

Sequelize 4.3.2 n：m（多对多）关联：未处理拒绝SequelizeEagerLoadingError

1 个答案: