node.js - Sequelize 迁移更改列为 FK，然后撤消失败

Question

我正在尝试创建迁移文件以将 changeColumn 设为字符串(来自枚举)并引用其他表。

const enumStatus = ['PENDING', 'SUCCESSFUL', 'FAILED', 'FAILED_LAST_VALUE_MISSING', 'FAILED_LAST_DATE_MISSING', 'FAILED_OLD_LAST_DATE'];

module.exports = {
  up: async(queryInterface, Sequelize) => {
    return Promise.all([
      queryInterface.changeColumn('MeasurementTestResults', 'status', {
        type: Sequelize.STRING,
        allowNull: false
      }), queryInterface.addConstraint('MeasurementTestResults', {
        fields: ['status'],
        type: 'foreign key',
        name: 'statusFk',
        references: {
          table: 'MeasurementTestResultStatusEnums',
          field: 'code'
        },
        onDelete: 'cascade',
        onUpdate: 'cascade'
      })
    ]);
  },

  down: async(queryInterface, Sequelize) => {
    return Promise.all([
      queryInterface.removeConstraint('MeasurementTestResults', 'statusFk'),
      queryInterface.changeColumn('MeasurementTestResults', 'status', {
        type: Sequelize.ENUM(...enumStatus),
        allowNull: false
      })
    ]);
  }
};

db:migrate 运行完美，但是当我尝试调用 db:migrate:undo 时，它会乱序执行命令吗？

== 20201217194748-measurementTestResult_changeColumn_status: reverting =======
Executing (default): SELECT CONSTRAINT_CATALOG AS constraintCatalog, CONSTRAINT_NAME AS constraintName, CONSTRAINT_SCHEMA AS constraintSchema, CONSTRAINT_TYPE AS constraintType, TABLE_NAME AS tableName, TABLE_SCHEMA AS tableSchema from INFORMATION_SCHEMA.TABLE_CONSTRA
INTS WHERE table_name='MeasurementTestResults' AND constraint_name = 'statusFk' AND TABLE_SCHEMA = 'iot_crcm_application_data1';
Executing (default): ALTER TABLE `MeasurementTestResults` CHANGE `status` `status` ENUM('PENDING', 'SUCCESSFUL', 'FAILED', 'FAILED_LAST_VALUE_MISSING', 'FAILED_LAST_DATE_MISSING', 'FAILED_OLD_LAST_DATE') NOT NULL;
Executing (default): ALTER TABLE `MeasurementTestResults`
      DROP FOREIGN KEY `statusFk`;

ERROR: (conn=143438, no: 1832, SQLState: HY000) Cannot change column 'status': used in a foreign key constraint 'statusFk'
sql: ALTER TABLE `MeasurementTestResults` CHANGE `status` `status` ENUM('PENDING', 'SUCCESSFUL', 'FAILED', 'FAILED_LAST_VALUE_MISSING', 'FAILED_LAST_DATE_MISSING', 'FAILED_OLD_LAST_DATE') NOT NULL; - parameters:[]

然后当我尝试从下脚本中删除 queryInterface.removeConstraint('MeasurementTestResults', 'statusFk'), 这一行时，它可以工作，但是在我尝试出错之前没有...

Answer 1

不要尝试使用 Promise.all 并行执行相互依赖的结构更改。你最好一一调用:

await queryInterface.removeConstraint('MeasurementTestResults', 'statusFk')
await queryInterface.changeColumn('MeasurementTestResults', 'status', {
   type: Sequelize.ENUM(...enumStatus),
   allowNull: false
})

up 方法也是如此。