如何在Keystone.js List Map中指定多个字段？

想知道如何在 Keystone.js List Map 中指定多个字段。

例如，基于 Keystone 数据模型文档：

http://keystonejs.com/docs/database/ http://keystonejs.com/docs/database/

var keystone = require('keystone'),
    Types = keystone.Field.Types;

var Post = new keystone.List('Post', {
    autokey: { path: 'slug', from: 'title', unique: true },
    map: { name: 'title' },
    defaultSort: '-createdAt'
});

Post.add({
    title: { type: String, required: true },
    state: { type: Types.Select, options: 'draft, published, archived', default: 'draft' },
    author: { type: Types.Relationship, ref: 'User' },
    createdAt: { type: Date, default: Date.now },
    publishedAt: Date,
    image: { type: Types.CloudinaryImage },
    content: {
        brief: { type: Types.Html, wysiwyg: true, height: 150 },
        extended: { type: Types.Html, wysiwyg: true, height: 400 }
    }
});

Post.defaultColumns = 'title, state|20%, author, publishedAt|15%'
Post.register();

我可以同时使用标题和作者来创建地图，以便这两个字段都将在外部模型关系中使用吗？

var Post = new keystone.List('Post', {
    autokey: { path: 'slug', from: 'title', unique: true },
    map: { name: 'author, title' },
    defaultSort: '-createdAt'
});

我在管理用户界面中收到“未定义”。

我可以通过以下方式实现多键映射产生的价值 http://keystonejs.com/docs/database/#fields-watching:

示例模型Post可以写成如下：

var keystone = require('keystone'),
    Types = keystone.Field.Types;

var Post = new keystone.List('Post', {
    autokey: { path: 'slug', from: 'newKey', unique: true },
    map: { name: 'newKey' },
    defaultSort: '-createdAt'
});

Post.add({
    newKey: { type: Types.Text, watch: true, noedit: true, value: function (callback) {
        var author = this.author;
        var title = this.title;
        keystone.list('User').model.findOne({_id: this.author.toString()}).exec(function (err, u) {
            if (err) {
                callback(err, "unknown")
            } else {
                var r = "("+u.name.first+" "+u.name.last+")-"+title;
                callback(null, r)
            }
        });
    }},
    title: { type: String, required: true, index: true, initial: true },
    state: { type: Types.Select, options: 'draft, published, archived', default: 'draft' },
    author: { type: Types.Relationship, ref: 'User', index: true, initial: true },
    createdAt: { type: Date, default: Date.now },
    publishedAt: Date,
    image: { type: Types.CloudinaryImage },
    content: {
        brief: { type: Types.Html, wysiwyg: true, height: 150 },
        extended: { type: Types.Html, wysiwyg: true, height: 400 }
    }
});

Post.defaultColumns = 'title, state|20%, author, publishedAt|15%'
Post.register();

对于上述模型，在创建 Post 时，首先会询问 Title 和 Author：

这将创建一个像这样的帖子，其中包含多个字段作为地图：