实施例

Question

使用sequelize cli实用程序的迁移功能时，可以通过添加新列来创建新的外键。但是，在尝试为同一模型创建多个外键时遇到错误。通过运行sequelize db:migrate生成的外键名称并不鲜明。数据库引擎要求为所有外键分配一个唯一的名称，但SequelizeJS似乎最初将所有外键命名为：

// Excerpt from sequelize/lib/dialects/mysql/query-generator.js
// Line 195
{fkName: this.quoteIdentifier(attrName + '_foreign_idx')}

如果索引号idx未正确递增，这当然会产生相等的键。

在Sequelize库中的某个地方，idx部分_foreign_idx部分必须在使用db.sync()初始化模型时替换为实际数值，但我无法识别。我还验证了sequelize在使用db.sync()时通过检查另一个数据库中的外键确实增加了索引值。在该数据库中，外键被命名为_ibfk_1，_ibfk_2，..，_ibfk_n

有没有人遇到过外键生成器的问题产生相同的名字？
有没有人对如何做出建议？使用Sequelize迁移时可以避免/缓解这种情况吗？

我使用 MySQL 作为数据库引擎，但外键名称生成器遵循相同的过程，例如。 postgre以及我能够解释续集源代码。

实施例

以下迁移将创建三个模型，并使用sequelize cli中的函数addColumn函数在它们之间创建关系。

该脚本模拟了 coach 和团队都由某些赞助商赞助的场景。在这个模型中，我们想在我们的教练和团队模型中引用赞助商ID。不幸的是，这将创建两个名为sponsorId_foreign_idx的外键（一个在教练上，一个在团队模型上），因此外键不具有唯一名称。但是，如果idx被某个递增的值更改，则可以避免这种情况。

var Promise = require('bluebird');

module.exports = {
  up: function (queryInterface, Sequelize) {
    return Promise
      .join(
        queryInterface
          .createTable('sponsor', {
            id: {
              autoIncrement: true,
              primaryKey: true,
              type: Sequelize.INTEGER
            },
            name: {
              type: Sequelize.STRING
            },
          }),
        queryInterface
          .createTable('team', {
            id: {
              autoIncrement: true,
              primaryKey: true,
              type: Sequelize.INTEGER
            },
            name: {
              type: Sequelize.STRING
            },
          }),
        queryInterface
          .createTable('coach', {
            id: {
              autoIncrement: true,
              primaryKey: true,
              type: Sequelize.INTEGER
            },
            name: {
              type: Sequelize.STRING
            },
          })
      )
      .then(function(){
        return queryInterface
          .addColumn('team', 'sponsorId', {
            type: Sequelize.INTEGER,
            references: { model: 'sponsor', key: 'id' }
          })
          .then(function(){
            return queryInterface
              .addColumn('coach', 'sponsorId', {
                type: Sequelize.INTEGER,
                references: { model: 'sponsor', key: 'id' }
              });
          });
      });
  },

  down: function (queryInterface, Sequelize) {
    return queryInterface.dropAllTables(); 
  }
};

完成错误日志转储

{ SequelizeBaseError: ER_DUP_KEY: Can't write; duplicate key in table '#sql-3b7_f1'
    at Query.formatError (/home/usr/me/node_modules/sequelize/lib/dialects/mysql/query.js:175:14)
    at Query._callback (/home/usr/me/node_modules/sequelize/lib/dialects/mysql/query.js:49:21)
    at Query.Sequence.end (/home/usr/me/node_modules/mysql/lib/protocol/sequences/Sequence.js:86:24)
    at Query.ErrorPacket (/home/usr/me/node_modules/mysql/lib/protocol/sequences/Query.js:94:8)
    at Protocol._parsePacket (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:280:23)
    at Parser.write (/home/usr/me/node_modules/mysql/lib/protocol/Parser.js:74:12)
    at Protocol.write (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:39:16)
    at Socket.<anonymous> (/home/usr/me/node_modules/mysql/lib/Connection.js:109:28)
    at emitOne (events.js:96:13)
    at Socket.emit (events.js:188:7)
    at readableAddChunk (_stream_readable.js:176:18)
    at Socket.Readable.push (_stream_readable.js:134:10)
    at TCP.onread (net.js:551:20)
  name: 'SequelizeDatabaseError',
  message: 'ER_DUP_KEY: Can\'t write; duplicate key in table \'#sql-3b7_f1\'',
  parent: 
   { Error: ER_DUP_KEY: Can't write; duplicate key in table '#sql-3b7_f1'
       at Query.Sequence._packetToError (/home/usr/me/node_modules/mysql/lib/protocol/sequences/Sequence.js:52:14)
       at Query.ErrorPacket (/home/usr/me/node_modules/mysql/lib/protocol/sequences/Query.js:83:18)
       at Protocol._parsePacket (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:280:23)
       at Parser.write (/home/usr/me/node_modules/mysql/lib/protocol/Parser.js:74:12)
       at Protocol.write (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:39:16)
       at Socket.<anonymous> (/home/usr/me/node_modules/mysql/lib/Connection.js:109:28)
       at emitOne (events.js:96:13)
       at Socket.emit (events.js:188:7)
       at readableAddChunk (_stream_readable.js:176:18)
       at Socket.Readable.push (_stream_readable.js:134:10)
       at TCP.onread (net.js:551:20)
       --------------------
       at Protocol._enqueue (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:141:48)
       at Connection.query (/home/usr/me/node_modules/mysql/lib/Connection.js:214:25)
       at /home/usr/me/node_modules/sequelize/lib/dialects/mysql/query.js:40:21
       at Promise._execute (/home/usr/me/node_modules/bluebird/js/release/debuggability.js:300:9)
       at Promise._resolveFromExecutor (/home/usr/me/node_modules/bluebird/js/release/promise.js:481:18)
       at new Promise (/home/usr/me/node_modules/bluebird/js/release/promise.js:77:14)
       at Query.run (/home/usr/me/node_modules/sequelize/lib/dialects/mysql/query.js:39:17)
       at /home/usr/me/node_modules/sequelize/lib/sequelize.js:849:20
       at /home/usr/me/node_modules/retry-as-promised/index.js:40:21
       at Promise._execute (/home/usr/me/node_modules/bluebird/js/release/debuggability.js:300:9)
       at Promise._resolveFromExecutor (/home/usr/me/node_modules/bluebird/js/release/promise.js:481:18)
       at new Promise (/home/usr/me/node_modules/bluebird/js/release/promise.js:77:14)
       at retryAsPromised (/home/usr/me/node_modules/retry-as-promised/index.js:30:10)
       at /home/usr/me/node_modules/sequelize/lib/sequelize.js:848:12
       at tryCatcher (/home/usr/me/node_modules/bluebird/js/release/util.js:16:23)
       at Promise._settlePromiseFromHandler (/home/usr/me/node_modules/bluebird/js/release/promise.js:510:31)
     code: 'ER_DUP_KEY',
     errno: 1022,
     sqlState: '23000',
     index: 0,
     sql: 'ALTER TABLE `coach` ADD `sponsorId` INTEGER, ADD CONSTRAINT `sponsorId_foreign_idx` FOREIGN KEY (`sponsorId`) REFERENCES `sponsor` (`id`);' },
  original: 
   { Error: ER_DUP_KEY: Can't write; duplicate key in table '#sql-3b7_f1'
       at Query.Sequence._packetToError (/home/usr/me/node_modules/mysql/lib/protocol/sequences/Sequence.js:52:14)
       at Query.ErrorPacket (/home/usr/me/node_modules/mysql/lib/protocol/sequences/Query.js:83:18)
       at Protocol._parsePacket (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:280:23)
       at Parser.write (/home/usr/me/node_modules/mysql/lib/protocol/Parser.js:74:12)
       at Protocol.write (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:39:16)
       at Socket.<anonymous> (/home/usr/me/node_modules/mysql/lib/Connection.js:109:28)
       at emitOne (events.js:96:13)
       at Socket.emit (events.js:188:7)
       at readableAddChunk (_stream_readable.js:176:18)
       at Socket.Readable.push (_stream_readable.js:134:10)
       at TCP.onread (net.js:551:20)
       --------------------
       at Protocol._enqueue (/home/usr/me/node_modules/mysql/lib/protocol/Protocol.js:141:48)
       at Connection.query (/home/usr/me/node_modules/mysql/lib/Connection.js:214:25)
       at /home/usr/me/node_modules/sequelize/lib/dialects/mysql/query.js:40:21
       at Promise._execute (/home/usr/me/node_modules/bluebird/js/release/debuggability.js:300:9)
       at Promise._resolveFromExecutor (/home/usr/me/node_modules/bluebird/js/release/promise.js:481:18)
       at new Promise (/home/usr/me/node_modules/bluebird/js/release/promise.js:77:14)
       at Query.run (/home/usr/me/node_modules/sequelize/lib/dialects/mysql/query.js:39:17)
       at /home/usr/me/node_modules/sequelize/lib/sequelize.js:849:20
       at /home/usr/me/node_modules/retry-as-promised/index.js:40:21
       at Promise._execute (/home/usr/me/node_modules/bluebird/js/release/debuggability.js:300:9)
       at Promise._resolveFromExecutor (/home/usr/me/node_modules/bluebird/js/release/promise.js:481:18)
       at new Promise (/home/usr/me/node_modules/bluebird/js/release/promise.js:77:14)
       at retryAsPromised (/home/usr/me/node_modules/retry-as-promised/index.js:30:10)
       at /home/usr/me/node_modules/sequelize/lib/sequelize.js:848:12
       at tryCatcher (/home/usr/me/node_modules/bluebird/js/release/util.js:16:23)
       at Promise._settlePromiseFromHandler (/home/usr/me/node_modules/bluebird/js/release/promise.js:510:31)
     code: 'ER_DUP_KEY',
     errno: 1022,
     sqlState: '23000',
     index: 0,
     sql: 'ALTER TABLE `coach` ADD `sponsorId` INTEGER, ADD CONSTRAINT `sponsorId_foreign_idx` FOREIGN KEY (`sponsorId`) REFERENCES `sponsor` (`id`);' },
  sql: 'ALTER TABLE `coach` ADD `sponsorId` INTEGER, ADD CONSTRAINT `sponsorId_foreign_idx` FOREIGN KEY (`sponsorId`) REFERENCES `sponsor` (`id`);' }

Answer 1

经过一番挖掘后，我发现v3.21中引入了this is a bug。有人fixed it in the v4 alpha branch，但不是v3，这是当前的发布分支。我为v3提交了backport of the patch，但它会在一段时间内发布。

与此同时，我使用了您在上述评论中推荐的手动查询。它不会太痛苦，因为它只影响在现有表上添加/更改查询，而不影响新表上的外键。

这些示例在文档中有点模糊，因此对于其他可能偶然发现这个问题的人来说，这是我从umzug迁移中得到的。

up: function (queryInterface, Sequelize) {
    return queryInterface
        .addColumn('operators', 'organization_id', {
            type: Sequelize.INTEGER,
            allowNull: true,
            // This bit will cause the naming conflict
            // references: { model: 'organizations', key: 'id' },
            // onUpdate: 'CASCADE',
            // onDelete: 'RESTRICT'
        })
        .then(() => queryInterface
            .sequelize
            .query('ALTER TABLE `operators` ADD CONSTRAINT `operators_organization_id_foreign_idx` FOREIGN KEY (`organization_id`) REFERENCES `organizations` (`id`) ON DELETE RESTRICT ON UPDATE CASCADE;',
                { type: Sequelize.QueryTypes.RAW }));
},

SequelizeJS迁移：将多个外键添加到同一模型？

实施例

完成错误日志转储

1 个答案: