如何在关联查询中指定外键

Question

当我进行包含另一个模型的查询时，如何指定一个外键，因为该模型有很多外键。

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 有两个关联时

用户多次与关注者关联。要识别正确的关联，您必须使用“as”关键字来指定要包含的关联的别名

DBFollower.findAll({ where: { followerUserID: req.params.userID }, include: [ 
    { model: DBUser, attributes: { exclude: ['email', 'password', 'loginType', 'telephoneNumber'] }}
]})

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' })

Answer 1

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;
};

更新：

现在与您的关联：

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' })