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.
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！