为t.string选择预定义的值 [英] Select amongst predefined values for a t.string

问题描述

是否可以创建一个

  collection_select 
  

或

 选择标记
  
 
 
 
 
 $ p $  t.string 
  

如果用户可以在字符串的预定义值中进行选择，并且只允许将这些值存储在数据库中字符串？例如

  t.string：relationship_status 
  

我想要预定义的值：

 在关系
 Single 
 Maried 
 Engaged 
 ETC 
  

解决方案

可能有用的最简单的事情 与：

  class Person< ActiveRecord :: Base 
 RELATIONSHIP_STATUSES = [
single，
in relationship，
together，
很复杂
] 
 
验证：relationship_status，：inclusion => RELATIONSHIP_STATUSES 
 end 
  

然后，在视图中：

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

这产生：

 < select name =person [relationship_status]> ; 
< option value =single>单一< / option> 
< / option>关系中的选项值=>> 
 
 ... 
< / select> 
  

Is it possible to create a

collection_select 

or

select tag 

for a

t.string

Where a user can select amongst predefined values for the string and only those values allowed to be stored in the database for the string? For example

t.string :relationship_status

And I want predefined values:

In a relationship
Single
Maried
Engaged
ETC 

解决方案

The Simplest Thing That Could Possibly Work is along the lines of:

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

  validates :relationship_status, :inclusion => RELATIONSHIP_STATUSES
end

Then later, in the view:

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

This produces:

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

  ...
</select>

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