在 Sequelize 中的关联之间切换（同时一对多和多对多）

Question

我有 table 个 User、Assignment、FavoriteAssignment。 User可以创建多个Assignment，只会分配给他，即one to many关联。但是许多 User 可以将许多 Assignment 添加到他们的收藏夹中，即 many to many 通过 FavoriteAssignment table.

关联

如何添加 User 创建的作业或他最喜欢的作业？我的意思是在使用 sequelize?

进行包含时，我应该如何在关联子之间切换

用户的关联：

  class User extends Model {
    static associate(models) {
      User.hasMany(models.Assignment, { foreignKey: 'authorTelegramId'});
      User.belongsToMany(models.Assignment, { through: 'FavoriteAssignments', foreignKey: 'telegramId'});
    }
  };

作业关联：

  class Assignment extends Model {
    static associate(models) {
      Assignment.belongsTo(models.User, {foreignKey: 'authorTelegramId'});
      Assignment.belongsToMany(models.User, {through: 'FavoriteAssignments', foreignKey: 'assignmentId'});
    }
  };

FavoriteAssignment 的关联：

  class FavoriteAssignment extends Model {
    static associate(models) {
      FavoriteAssignment.belongsTo(models.User, {foreignKey: 'telegramId'});
      FavoriteAssignment.belongsTo(models.Assignment, {foreignKey: 'assignmentId'});
    }
  };

我来到这个问题，因为当我做的时候：

const result = await db.User.findAll({
    include: [{
        model: db.Assignment
    }]
});

它获取所有 User 最喜欢的作业，因为 belongsToMany 是最后定义的！如果我评论 User.belongsToMany(models.Assignment, { through: 'FavoriteAssignments', foreignKey: 'telegramId'}); 行，那么它将获取所有 User 创建的作业（one to many 关联）。

如果我有多个协会，我如何选择我想使用哪个协会？

Answer 1

基本上我必须这样命名关联：

  User.hasMany(models.Assignment, { foreignKey: 'authorTelegramId', as: 'assignments'});
  User.belongsToMany(models.Assignment, { through: 'FavoriteAssignments', foreignKey: 'telegramId', as: 'favoriteAssignments'});

然后调用它：

const result = await db.User.findAll({
    include: ['assignments']
});
const result1 = await db.User.findAll({
    include: ['favoriteAssignments']
});

在 Sequelize 中的关联之间切换（同时一对多和多对多）

Switch between associatons in Sequelize (One To Many and Many to Many at the same time)

javascript

postgresql

many-to-many

one-to-many

sequelize.js