“用户未关联到提要！”续集

Posted 2023-04-12

【中文标题】“用户未关联到提要！”续集

【英文标题】："user is not associated to feed!" sequelizejs

【发布时间】：2016-07-17 20:10:22

【问题描述】：

由于某种原因，他没有找到关联。我创建了关联，外键在 postgres 中完美创建。

user.js

'use strict';

module.exports = app => 
    const sequelize = app.db_connect.postgres.connect;
    const Sequelize = app.db_connect.postgres.require;
    const Reputation = app.models.reputation;
    const Report = app.models.report;
    const Group = app.models.group;
    const Participant = app.models.participant;
    const Topic = app.models.topic;
    const Feed = app.models.feed;

    const User = sequelize.define('user', 
        //atributes
    );

    User.belongsToMany(User,  as: 'User', through: 'relationship', foreignKey: 'userId' );
    User.belongsToMany(User,  as: 'Following', through: 'relationship', foreignKey: 'followingId' );
    User.belongsToMany(Group,  as: 'Member', through: Participant, foreignKey: 'userId' );
    User.hasMany(Report);
    User.hasMany(Topic);
    User.hasMany(Feed); //associate


    return User;

feed.js

'use strict';

module.exports = app => 
    const sequelize = app.db_connect.postgres.connect;
    const Sequelize = app.db_connect.postgres.require;
    const Report = app.models.report;

    const Feed = sequelize.define('feed', 
        //atributes
    );

    Feed.hasMany(Feed, as: 'father');
    Feed.hasMany(Report)

    return Feed;

呼叫：

    const User = app.models.user;
    const Sequelize = app.db_connect.postgres.require;

    Feed.findOne(
        include: User,
        where: 
            id: req.params.id
        
    )
    .then(result => res.json(result))
    .catch(error => 
        res.status(412).json(msg: error.message);
    );

用户和提要的关联为 1:n。所以我使用了hasMany sequelize。

【参考方案1】：

因为您查询的是 Feed，而不是 User，所以您还需要定义关联的“另一面”（反向）：

Feed.belongsTo(User, 
  as: 'User',
  foreignKey: 'UserID' // or whatever your fk column is named for Feed -> User
);

请注意，当您调用 Feed.findOne 时，通常需要传递与您在关联上设置的相同的 as 值：

Feed.findOne(
  include: 
    model: User,
    as: 'User' // must match the "as" from the defined association above
  ,
  where: 
    id: req.params.id
  
);