Javascript 如何在关联查询中指定外键

当我进行包含另一个模型的查询时，如何指定一个外键，因为我有许多外键用于该模型

DBTweet.findAll({ where: { userID: followingUserID }, include: [
            { model: DBUser, 
        include: [
                { model: DBFollower // Here i want to specify the foreign key },
        ] },
]})

更新：

当我与as有两种关联时

用户多次与关注者关联。要标识正确的关联，必须使用“as”关键字指定要包含的关联的别名

这些是我的联想：

DBUser.hasMany(DBTweet, { foreignKey: 'userID' }, { onDelete: 'cascade' })
DBTweet.belongsTo(DBUser, {foreignKey: 'userID'}, { onDelete: 'cascade' })

DBUser.hasMany(DBFollower, { as: 'followingUserIDAlias', foreignKey: 'followingUserID' }, { onDelete: 'cascade' })
DBFollower.belongsTo(DBUser, { as: 'followingUserIDAlias', foreignKey: 'followingUserID' }, { onDelete: 'cascade' })

DBUser.hasMany(DBFollower, { as: 'followerUserIDAlias', foreignKey: 'followerUserID' }, { onDelete: 'cascade' })
DBFollower.belongsTo(DBUser, { as: 'followerUserIDAlias', foreignKey: 'followerUserID' }, { onDelete: 'cascade' })

更新：

现在请大家联系：

DBUser.hasMany(DBTweet, { as: 'Users', foreignKey: 'userID', onDelete: 'cascade' })
DBTweet.belongsTo(DBUser, { as: 'Users', foreignKey: 'userID', onDelete: 'cascade' })

DBUser.hasMany(DBFollower, { as: 'followingUserIDAlias', foreignKey: 'followingUserID', onDelete: 'cascade' })
DBFollower.belongsTo(DBUser, { as: 'followingUserIDAlias', foreignKey: 'followingUserID', onDelete: 'cascade' })

DBUser.hasMany(DBFollower, { as: 'followerUserIDAlias', foreignKey: 'followerUserID', onDelete: 'cascade' })
DBFollower.belongsTo(DBUser, { as: 'followerUserIDAlias', foreignKey: 'followerUserID', onDelete: 'cascade' })

---

从DBUser到DBFollower，我有两个hasMany与as的关联：我得到一个错误：用户多次与followers关联。若要标识正确的关联，必须使用“as”关键字指定要包含的关联的别名。如错误所示，您需要在每个关联上放置别名。为了避免这种情况，请始终使用别名。如果我按如下操作：在DBFollower findAll查询中，我会得到相同的错误。再次参见问题A请使用

DBTweet

、

DBUser

和

DBFollower

的关联进行更新，再次参见问题

DBTweet.findAll({ 
  where: { userID: followingUserID }, 
  include: [{ 
    model: DBUser,
    as: 'Users', //here goes the alias as well
    include: [{ 
      model: DBFollower, 
      as: 'Followers' //here is goes the alias of the association
    }],
  }]
});


module.exports = (sequelize, DataTypes) => {
  const DBUser = sequelize.define('DBUser', {
    // your attributes
  });

  DBUser.associate = (models) => {
    DBUser.hasMany(models.DBFollower,  {  as: 'Followers',  foreignKey: 'your_key' });
    // DBUser.belongsTo(models.DBFollower,  {  as: 'Followers',  foreignKey: 'branch_id' });
  };

  return DBUser;
};

DBUser.hasMany(DBTweet, { as: 'Users', foreignKey: 'userID', onDelete: 'cascade' })
DBTweet.belongsTo(DBUser, { as: 'Users', foreignKey: 'userID', onDelete: 'cascade' })

DBUser.hasMany(DBFollower, { as: 'followingUserIDAlias', foreignKey: 'followingUserID', onDelete: 'cascade' })
DBFollower.belongsTo(DBUser, { as: 'followingUserIDAlias', foreignKey: 'followingUserID', onDelete: 'cascade' })

DBUser.hasMany(DBFollower, { as: 'followerUserIDAlias', foreignKey: 'followerUserID', onDelete: 'cascade' })
DBFollower.belongsTo(DBUser, { as: 'followerUserIDAlias', foreignKey: 'followerUserID', onDelete: 'cascade' })