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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，我在尝试为同一模型创建多个外键时遇到了错误。运行产生的外键名sequelize db:migrate没有区别。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')}

idx如果索引号没有正确增加，这当然会产生相等的键。

在 Sequelize 库中的某处，使用 初始化模型时idx，必须将 的部分_foreign_idx替换为实际数值db.sync()，但我无法确定在哪里。我还db.sync()通过检查另一个数据库中的外键验证了 sequelize 在使用时确实增加了索引值。在那个数据库中，外键被命名为_ibfk_1, _ibfk_2, ..,_ibfk_n

  • 有没有人遇到过外键生成器产生相同名称的问题？
  • 有没有人建议在使用 Sequelize 迁移时如何避免/减轻这种情况？

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 也是如此，就我能够解释续集源代码而言。

例子

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

该脚本模拟了教练和团队都由某个赞助商赞助的场景。在这个模型中，我们希望在我们的教练和团队模型中都保存对赞助商 ID 的引用。不幸的是，这将创建两个具有名称的外键sponsorId_foreign_idx（一个在教练上，一个在团队模型上），因此外键不会有唯一的名称。idx但是，如果通过一些增量值进行更改，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`);' }
4

1 回答 1

2

经过一番挖掘，我发现这是v3.21 中引入的一个错误。有人在 v4 alpha 分支中修复了它，但没有在当前版本分支 v3 中修复。我提交了v3补丁的反向移植，但它需要一段时间才能发布。

与此同时，我采用了您在上面评论中推荐的手动查询。这并不太痛苦，因为它只影响对现有表的添加/更改查询，而不影响新表上的外键。

文档中的示例有点含糊，因此对于可能偶然发现此问题的其他人，这是我从 umzug 迁移中获得的内容。

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 }));
},
于 2017-03-26T18:43:40.447 回答