Rails:将文本区域用于:has_many关系

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…

1. 包装您的textarea-data属性设置器方法以包括以下功能……
2. 从文本区域的每一行中解析出相关信息，然后…
3. 为每个调用原始的setter方法.
4. 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.

这篇关于Rails:将文本区域用于:has_many关系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！