rails select使用小结

最近经常使用select下拉标签

个人比较喜欢用select 和 select_tag 两个

[b]select_tag(name, option_tags = nil, options = {}) [/b]
Creates a dropdown selection box, or if the :multiple option is set to true, a multiple choice selection box. 

Helpers::FormOptions can be used to create common select boxes such as countries, time zones, or associated records. option_tags is a string containing the option tags for the select box. 

Options
:multiple - If set to true the selection will allow multiple choices. 

:disabled - If set to true, the user will not be able to use this input. 

Any other key creates standard HTML attributes for the tag. 

select_tag "people", options_from_collection_for_select(@people, "name", "id")
  # <select id="people" name="people"><option value="1">David</option></select>

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[b]select(object, method, choices, options = {}, html_options = {}) [/b]

Create a select tag and a series of contained option tags for the provided object and method. The option currently held by the object will be selected, provided that the object is available. See options_for_select for the required format of the choices parameter. 

Example with @post.person_id => 1: 

  select("post", "person_id", Person.all.collect {|p| [ p.name, p.id ] }, { :include_blank => true })

首先两者在传递参数上有点区别
select_tag传的就是一个参数（字符串）
select  object/method 即对象和方法（属性）


options_from_collection_for_select(@people, "name", "id")
@people为对象货以对象为单元的数组，name为option的text值，id为option的value值

也可以用
options_for_select(Warehouse.find(:all).collect{|item|[item.name,item.id]}.insert(0,['请选择',0]))