Bookshelf.js设置属性不在数据库中 [英] Bookshelf.js set attribute not in database

问题描述

我有一个Bookshelf.js模型。我希望能够为此模型设置和获取在数据库中不持久的属性。

I have a Bookshelf.js model. I want to be able to set and get attributes for this model that are not persistent in the database.

例如，假设我有一个如下所示的模型：

For instance lets say I have a model that looks like this:

var Domain = bookshelf.Model.extend({
      tableName: 'domains',
      initialize: function() {
        this.on('creating', this.setDomainName);
      },
      setDomainName: function() {
        this.set('name', getDomainFromUrl(this.url));
      }
    });

使用如下模式：

knex.schema.createTable('domains', function (table) {
    table.increments().index();
    table.text('name').index();
    table.timestamps();
  });

我希望能够保存名为url的属性，然后再将url解析为域之前它节省了。

I want to be able to save an attribute called url, then later parse the url into a domain before it saves.

当我尝试这样的事情时：

When I try something like this:

new Domain({url: 'http://someurl.com/foo/bar'}).save()

我收到错误消息：

"column \"url\" of relation \"domains\" does not exist"

我看了看。我找不到任何方法来将非持久性属性添加到bookshelf.js模型中。我也找不到任何关于将自定义getter和setter方法添加到bookshelf.js模型的内容。

I've looked and looked. I cant find any way to add non-persistent attributes to a bookshelf.js model. I also couldn't find anything about adding custom getter and setter methods to a bookshelf.js model.

感谢任何帮助或见解！

推荐答案

在我的手机上，请原谅简短的回复，但你想要的是虚拟或复合字段。

On my phone, so forgive the short reply, but what you want is called 'virtual' or 'composite' fields.

https://github.com/tgriesser/bookshelf/ wiki /插件：-Virtuals

每个数据库映射器都有它们，但当你不知道它们被称为什么时，谷歌解决方案难以理解。

Every database mapper has them, but when you don't know what they're called it's understandably difficult to google a solution.

这篇关于Bookshelf.js设置属性不在数据库中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！