javascript - 关联查询中如何指定外键

Question

当我进行包含另一个模型的查询时，如何指定外键，因为我有该模型的许多外键。

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

users is associated to followers multiple times. To identify the correct association, you must use the 'as' keyword to specify the alias of the association you want to include

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:

现在与您的协会:

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' })