在t.string的预定义值中选择

Question

有可能创建一个

collection_select 

要么

select tag 

为一个

t.string

用户可以在字符串的预定义值中进行选择,只允许那些值存储在字符串的数据库中？例如

t.string :relationship_status

我想要预定义的值:

In a relationship
Single
Maried
Engaged
ETC 

Answer 1

可能工作的最简单的事情是:

class Person < ActiveRecord::Base
  RELATIONSHIP_STATUSES = [
    "single",
    "in a relationship",
    "together",
    "it's complicated"
  ]

  validates :relationship_status, :inclusion => RELATIONSHIP_STATUSES
end

然后,在视图中:

collection_select(:person, :relationship_status, Person::RELATIONSHIP_STATUSES, :to_s)

这会产生:

<select name="person[relationship_status]">
  <option value="single">single</option>
  <option value="in a relationship">in a relationship</option>

  ...
</select>