Rails:将文本区域用于:has

本文介绍了Rails:将文本区域用于:has_many关系的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

大家好，第一个问题.

我有几个产品和用户可以将这些产品放入心愿单. 一个用户可以有多个愿望清单(出于不同的目的). 产品可以添加到愿望清单"中，但是还涉及其他信息:您必须指定某个产品的数量.此逻辑用于包含范围为 quantity 的Inclusion.

I have a couple of Products and Users that can put those Products on Wishlists. A User can have many Wishlists (for different purposes). Products can be added to Wishlists, but there's additional information involved: you have to specify an amount of a certain Product. This logic is used in the Inclusion, which has a field quantity.

Class Wishlist belongs_to :user # User class is irrelevant here has_many :inclusions has_many :products, :through => :inclusions end Class Product has_many :inclusions has_many :wishlists, :through => :inclusions end Class Inclusion belongs_to :product belongs_to :wishlist end

这一切都很好，但是现在是一个真正的问题. 愿望清单应通过文本区域进行编辑.语法很简单:数量产品名. 所有用户都使用此语法. 例如，编辑心愿单应如下所示:

This is all working great, but now for the real question. Wishlists should be edited through textareas. The syntax is simple: quantity productname. All users use this syntax. For example, editing a Wishlist should look like this:

<textarea> 1 Bicycle 4 Shoe 1 Telephone </textarea>

提交表单时，所有逻辑都应在幕后处理.因此，如果摘下"1电话"，则包含物应被销毁.如果添加或修改了一行，则应创建或更新相应的包含，以使数据库与该文本区域的内容同步.

When the form is submitted, all the logic should be dealt with behind the scenes. So if the "1 Telephone" is taken off, the Inclusion should be destroyed. If a line is added or modified, the corresponding Inclusion should be created or updated, so that the database is synchronized with the contents of that textarea.

我搜索过高和低，但是找不到解决方案. 预先感谢！

I have searched high and low, but could not find a solution for this. Thanks in advance!

推荐答案

这是一个坏主意，但是为了让您从自己的错误中学习……

This is a bad idea, but for the sake of letting you learn from your own mistakes…

包装您的textarea-data属性设置器方法以包括以下功能……

从文本区域的每一行中解析出相关信息，然后…

为每个调用原始的setter方法.

在吸气剂上做相反的事情.

您的验证，关联等都仍然有效，并且处理此问题的逻辑已经整齐打包，以便以后遇到问题时可以轻松地将其丢弃.

Your validations, associations, etc. all still work, and your logic to handle this is neatly packaged so that you can easily throw it away later if/when you run into problems.