下拉框的 Ruby on Rails 静态列表选项 [英] Ruby on Rails Static List Options for Drop Down Box

问题描述

我的数据库中有一个 Person 表，并且有一个名为 person_type 的列.我不想要 person_type 的数据库模型，因为它总是志愿者"或参与者".我将在哪里创建一个静态数组来保存这些值，以及如何将该数组绑定到 Ruby on Rails 选择助手?最好只创建一个选择助手吗?

I have a Person table in my database and I have a column named person_type. I don't want a database model for person_type as it will always be either "Volunteer" or "Participant". Where would I create a static array to hold these values and how would I bind that array to the Ruby on Rails select helper? Would it be best to just create a select helper?

谢谢！

推荐答案

最简单的实现方法是在你的 Person 模型中添加一个常量:

The simplest way to implement this is by having a constant in your Person model:

class Person < ActiveRecord:Base
  PERSON_TYPES = ["Volunteer", "Participant"]
end

然后您可以使用选择助手访问它:

which you can then access using the select helper:

f.select(:person_type, Person::PERSON_TYPES)

如果需要考虑i18n，只需要稍作修改即可.

If you need to consider i18n, it only needs a few slight modifications.

鉴于您的 i18n 文件中的这些条目:

Given these entries in your i18n files:

# config/locales/en.yml
person_types:
  volunteer: "Volunteer"
  participant: "Participant"

# config/locales/de.yml
person_types:
  volunteer: "Freiwillige"
  participant: "Teilnehmer"

您可以更新模型并查看:

You can update your model and view thus:

# app/models/person.rb
class Person < ActiveRecord:Base
  # The values have been made lower-case to match the conventions of Rails I18n
  PERSON_TYPES = ["volunteer", "participant"]
end

# app/views/people/_form.html.erb
<%= f.select :person_type, Person::PERSON_TYPES.map { |s| [I18n.t("person_types.#{s}"), s] } %>

这将为您提供所需的 HTML:

This will give you the HTML you're after:

<!-- assuming the current I18n language is set to 'de' -->
<select name="person[person_type]">
  <option value="volunteer">Freiwillige</option>
  <option value="participant">Teilnehmer</option>
</select>

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