从Rails 4.1中的select中保存枚举 [英] Saving enum from select in Rails 4.1

问题描述

我正在使用Rails 4.1中的枚举来跟踪葡萄酒的颜色。

Wine.rb

  class Wine< ActiveRecord :: Base 
枚举颜色：[：红色，白色，闪闪发光] 
结束
  

在我看来，我产生一个选择，所以用户可以选择一种具有某种颜色的葡萄酒

  f。输入：颜色，：as => ：select，：collection => Wine.colors 
  

这会生成以下HTML：

 < select id =wine_colorname =wine [color]> 
< option value =>< / option> 
< option value =0> red< / option> 
< option value =1> white< / option> 
< option value =2> sparkling< / option> 
< / select> 
  

但是，提交表单后，我收到一条参数错误，说明'1 '不是有效的颜色。我意识到这是因为 color 必须等于 1 而不是1。

有没有办法强制Rails将颜色解释为整数而不是字符串？

解决方案

好的，很明显，你不应该发送要保存的枚举的整数值。您应该发送枚举的文本值。

我将输入更改为以下内容：

f.input：color，：as => ：select，：collection =>其中生成以下HTML：

<$ p

$ p> < select id =wine_colorname =wine [color]>
< option value =>< / option>
< option value =red> red< / option>
< option value =white> white< / option>
< option value =sparkling> sparkling< / option>
< / select>


值从0变为红色，现在我们都设置好了。

---

如果您使用常规的ol'rails text_field，它是：

f.select：color，Wine.colors.keys.to_a

---

如果您想拥有干净的人性化属性，您还可以执行以下操作：

f.select：color，Wine。 colors.keys.map {| w | [w.humanize，w]}

I am using the enums in Rails 4.1 to keep track of colors of wine.

Wine.rb

class Wine < ActiveRecord::Base
    enum color: [:red, :white, :sparkling]
end

In my view, I generate a select so the user can select a wine with a certain color

f.input :color, :as => :select, :collection => Wine.colors

This generates the following HTML:

<select id="wine_color" name="wine[color]">
  <option value=""></option>
  <option value="0">red</option>
  <option value="1">white</option>
  <option value="2">sparkling</option>
</select>

However, upon submitting the form, I receive an argument error stating '1' is not a valid color. I realize this is because color must equal 1 and not "1".

Is there a way to force Rails to interpret the color as an integer rather than a string?

解决方案

Alright, so apparently, you shouldn't send the integer value of the enum to be saved. You should send the text value of the enum.

I changed the input to be the following:

f.input :color, :as => :select, :collection => Wine.colors.keys.to_a

Which generated the following HTML:

<select id="wine_color" name="wine[color]">
  <option value=""></option>
  <option value="red">red</option>
  <option value="white">white</option>
  <option value="sparkling">sparkling</option>
</select>

Values went from "0" to "red" and now we're all set.

---

If you're using a regular ol' rails text_field it's:

f.select :color, Wine.colors.keys.to_a

---

If you want to have clean human-readable attributes you can also do:

f.select :color, Wine.colors.keys.map { |w| [w.humanize, w] }

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