书架.js关系有很多错误

bookshelf.js relationship hasMany error

本文关键字：错误 js 关系 书架      更新时间：2023-09-26

我在使用 Booksshelf 的 hasMany 调用中收到以下错误：

 A valid target model must be defined for the roles hasMany relation

角色.js

var Data = require('../server-includes/Data'),
    User = require('./User');
var Role = Data.bookshelf.Model.extend({
  tableName: 'roles',
  users: function() {
    return this.hasMany(User, 'role_id');
  }
});
module.exports = Role;

用户.js

var Data = require('../server-includes/Data'),
    Role = require('./Role');
var User = Data.bookshelf.Model.extend({ 
  tableName: 'users',
  role: function() {
    return this.belongsTo(Role, 'id');
  },
};
module.exports = User;

用法：

new Role({ id: req.params.id })
.fetch({ require: true, withRelated:['users'] })
.then(function (role) {
  role.users().fetch().then(function(users) {
    console.log('users: ' + users);
  });
})

我将我的模型引用为字符串，并使用 Booksshelf 的注册表插件。 

var bookshelf = new Bookshelf( knex );
bookshelf.plugin( 'registry' );

然后我定义并创建一个模型：

var userModel = /*do bookshelf things*/;
bookshelf.model( 'User', userModel );

然后当我创建一个.hasMany时，我使用一个字符串来引用。

users: function() {
  return this.hasMany( 'User', 'roleId' );
},

帖子.js 

Bookshelf.plugin('registry')
var Category = require('./category')
var Post = Bookshelf.Model.extend({
    tableName: 'posts',
    hasTimestamps: true,
    categories: function () {
        return this.belongsTo('Category', 'category_id');
    },
});
module.exports = Bookshelf.model('Post',Post);

类别.js

Bookshelf.plugin('registry');
var Post = require('./post');
var Category = Bookshelf.Model.extend({
    tableName: 'categories',
    hasTimestamps: true,
    posts : function () {
         return this.hasMany('Post');
    }
});
module.exports = Bookshelf.model('Category', Category);
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