在外键列中设置值的问题

Question

我正在使用Sequelize.js与SQLite数据库，并面临一个设置外键值的问题。我有以下代码：

const MessageModel = sequelize.define('MessageModel ', {
    uuid: DataTypes.STRING,
    authorId: DataTypes.STRING,
    // ... other props
  }, {});

const TodoModel = sequelize.define('TodoModel', {
    ownerId: DataTypes.STRING,
    status: {
      type: DataTypes.STRING,
      defaultValue: 'pending'
    }
  }, {});

TodoModel.belongsTo(MessageModel , {
    foreignKey: {
        name: 'messageId',
        field: 'messageId',
        allowNull: false
    },
    targetKey: 'uuid'
});

MessageModel.create({
   uuid: 'testUUIDForExample'
   // other props
}).then(message => {

   console.log(`Message's created successful`);

   TodoModel.create({
      ownerId: 'id-string',
      status: 'test-status',
      messageId: 'testUUIDForExample'
   })
})

Sequelize在DB中创建了MessageModel-row，但是当它试图用这个错误生成TodoModel时它就会崩溃：

DatabaseError: SQLITE_ERROR: foreign key mismatch - "TodoModel" referencing "MessageModel "
    at Query.formatError (C:\Users\lrsvo\web-development\projects\platoon-web-electron\node_modules\sequelize\lib\dialects\sqlite\query.js:432:16)
    at Query._handleQueryResponse (C:\Users\lrsvo\web-development\projects\platoon-web-electron\node_modules\sequelize\lib\dialects\sqlite\query.js:77:18)
    at afterExecute (C:\Users\lrsvo\web-development\projects\platoon-web-electron\node_modules\sequelize\lib\dialects\sqlite\query.js:260:31)
    at Statement.errBack (C:\Users\lrsvo\web-development\projects\platoon-web-electron\node_modules\sqlite3\lib\sqlite3.js:16:21)

Err.original.message: "SQLITE_ERROR: foreign key mismatch - "TodoModel" referencing "MessageModel"

生成的SQL：

"INSERT INTO `TodoModel` (`id`,`ownerId`,`status`,`createdAt`,`updatedAt`,`messageId`) VALUES (NULL,$1,$2,$3,$4,$5);"

我的TodoModel表看起来像：

CREATE TABLE "TodoModel" (
    "id"            INTEGER PRIMARY KEY AUTOINCREMENT,
    "ownerId"   VARCHAR(255),
    "status"    TEXT DEFAULT 'pending',
    "createdAt" DATETIME NOT NULL,
    "updatedAt" DATETIME NOT NULL,
    "messageId" VARCHAR(255) NOT NULL,
    FOREIGN KEY("messageId") REFERENCES "MessageModel"("uuid") ON DELETE NO ACTION ON UPDATE CASCADE
);

我无法理解为什么错误发生并需要帮助，因为我在这个ORM中是假的。

我正在使用“sequelize”：“^ 5.1.0”与SQLite。

MyConfig文件：

const Sequelize = require("sequelize");
const electron = require('electron');
const storagePath = electron.app.getPath('userData') + '/plt.db';

module.exports = {
  development: {
    dialect: "sqlite",
    storage: storagePath,
    username: null,
    password: null,
    operatorsAliases: Sequelize.Op,
    define: { freezeTableName: true },
    query: { raw: true }, // Always get raw result
    logging: true,
  },
};

Answer 1

这里有一些东西。首先如果你要在MessageModel上使用uuid作为主键，你必须定义它，否则你将有一个默认的id字段。

const MessageModel = sequelize.define('MessageModel ', {
  uuid:{ // if this is your primary key you have to define it
    type: DataTypes.STRING,  //there is also DataTypes.UUID
    allowNull: false,
    primaryKey: true,
    unique: true
  }, 
  authorId: DataTypes.STRING,
  // ... other props
}, {});

然后在您的TodoModel上，您将messageId关联设置为整数。要将其更改为字符串，您必须在模型上定义字段，并在关联上将其用作外键。

const TodoModel = sequelize.define('TodoModel', {
  ownerId: DataTypes.STRING,
  status: {
    type: DataTypes.STRING,
    defaultValue: 'pending'
  },
  messageId: { //you also have to add the field on your model and set it as STRING, because on the association Sequelize by default is going to use INTEGER
    type: DataTypes.STRING,
    allowNull: false
  }
}, {});

TodoModel.belongsTo(MessageModel , {
  as: 'Message',
  foreignKey: 'messageId', // and you only set the foreignKey - Same name as your field above
});