javascript - Sequelize : Naming collision between attribute 'playlist' and association 'playlist' ?

Question

我正在使用 node.js、Sequelize 和 MariaDB，我遇到了以下错误，我不确定如何解决？

Error: Naming collision between attribute 'playlist' and association 'playlist' on model playlist_entry. To remedy this, change either foreignKey or as in your association definition

我的Javascript:

Entities = function (settings, context) {

    sequelize = context.sequelize;

    var entities = {

        Playlist: this.sequelize.define('playlist', {
            name: Sequelize.STRING,
            description: Sequelize.STRING
        }),     

        PlaylistEntry: this.sequelize.define('playlist_entry', {
            playlist: Sequelize.INTEGER
            //track: Sequelize.INTEGER
        })

    };  

     entities.PlaylistEntry.belongsTo(
         entities.Playlist,
         { foreignKey: { name: 'fk_playlist' }});

    return entities;                    
}

我的 table :

CREATE TABLE `playlist` (
  `id` int(11) unsigned NOT NULL,
  `name` varchar(255) NOT NULL,
  `description` varchar(255) DEFAULT NULL,
  `createdAt` timestamp NULL DEFAULT NULL,
  `updatedAt` timestamp NULL DEFAULT NULL,
  `external_id` int(11) DEFAULT NULL,
  PRIMARY KEY (`id`),
  UNIQUE KEY `id` (`id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;

CREATE TABLE `playlist_entry` (
  `id` int(11) unsigned NOT NULL AUTO_INCREMENT,
  `playlist` int(11) unsigned DEFAULT NULL,
  `track` int(11) unsigned DEFAULT NULL,
  `createdAt` timestamp NULL DEFAULT NULL,
  `updatedat` timestamp NULL DEFAULT NULL,
  PRIMARY KEY (`id`),
  KEY `track_idx` (`track`),
  KEY `playlist_idx` (`playlist`),
  CONSTRAINT `fk_playlist` FOREIGN KEY (`playlist`) REFERENCES `playlist` (`id`) ON DELETE NO ACTION ON UPDATE NO ACTION
) ENGINE=InnoDB AUTO_INCREMENT=2 DEFAULT CHARSET=utf8;

Answer 1

我在玩 Sequelize 时遇到了这个问题，这是因为 column name和 reference name是一样的

错误的实现

module.exports = (sequelize, DataTypes) => {
  const session = sequelize.define('session', {
    menteeId: DataTypes.INTEGER,
  }, {});

  session.associate = (models) => {
    session.belongsTo(models.user, {
      foreignKey: 'menteeId',
      as: 'menteeId',
      onDelete: 'CASCADE',
    });
  };
  return session;
};

这里 column name ( menteeId ) 和 alias name ( menteeId ) 相同，要解决此问题，您只需更改 alias name
正确实现

module.exports = (sequelize, DataTypes) => {
  const session = sequelize.define('session', {
    menteeId: DataTypes.INTEGER,
  }, {});

  session.associate = (models) => {
    session.belongsTo(models.user, {
      foreignKey: 'menteeId',
      as: 'MenteeId', // Changes applied here
      onDelete: 'CASCADE',
    });
  };
  return session;
};

在你的情况下，你可以这样做

entities.PlaylistEntry.belongsTo(
    entities.Playlist,
    { 
    foreignKey: { name: 'fk_playlist' },
    as: 'PlayListAlias', // Appropriate name
    },
);