Question

我有以下模特：

// User model
    const User = sequelize.define('users_dev', {
        id: {
            type: Sequelize.UUID
            primaryKey: true
        },
        fullName: {
            type: Sequelize.STRING,
            allowNull: false,
        }
    )}

// Game lobby model
    const Lobby = sequelize.define('lobbies_dev', {
        id: {
            type: Sequelize.UUID,
            primaryKey: true
        },
        player1: {
            type: Sequelize.UUID // Need reference by user id
        },
        player2: {
            type: Sequelize.UUID // Need reference by user id
        }

    )}

如何在lobby.player1（和2）与user.id之间创建关联？那么当我稍后向大厅提出请求时，我可以获得有关我的用户的信息吗？

我阅读了文档，尝试了很多选项，但只有6个小时的工作错误...

Answer 1

要正确关联，您不必在Lobby模型中定义用户字段，而是必须关联它们：

// User model
    const User = sequelize.define('user', { // note: changed the name
        id: {
            type: Sequelize.UUID
            primaryKey: true
        },
        fullName: {
            type: Sequelize.STRING,
            allowNull: false,
        }
    )}

// Game lobby model
    const Lobby = sequelize.define('lobby', { // note: changed the name
        id: {
            type: Sequelize.UUID,
            primaryKey: true
        }
    })

// associate Users and Lobby
User.belongsTo(Lobby) // this will add 'lobbyId' attribute to User

然后，您可以create或update具有此关联的实例模型

示例：

const lobby = await Lobby.create({})
const player1 = await User.create({ fullName: 'a name', lobbyId: lobby.id})

这将允许您稍后加入：

const lobby = await Lobby.findById(id, { include: [{ model: User }] })

我还强烈建议将users_dev和lobbies_dev分别更改为user和lobby，因为Sequelize使用这些字符串来命名模型。

如何使用sequelize创建用户和大厅之间的关联？

1 个答案: