Rails的Haml下拉菜單問題

Question

 form_for :radio, url(:radio, :add), :method => :put do |f|
    = f.error_messages
    %p
      = f.label :title, :caption => "Radio Name:"
      = f.text_field :title
    %p
      = f.select :city_name, XXXXXXXXXXXXXX
    %p
      = f.label :frequency
      = f.text_field :frequency
    %p
      = f.label :url
      = f.text_field :url
    %p
      = f.submit "Add", :class => 'button'

當我把XXXXXXXX作為

[['Hot','hot'],['Medium','medium'],['Cold','cold']]

甚至

City.all.map {|c| [c.city]}

我得到：

can't convert Array into Hash

任何幫助將不勝感激。

Answer 1

= f.select :city_name, City.all.map{ |c| [c.name, c.id] } = f.select :city_name, City.all.map{ |c| [c.name, c.id] }試試這個

Answer 2

您只需要將選項包裝在options_for_select 。 例如：

= f.select :city_name, options_for_select([['Hot','hot'],['Medium','medium'],['Cold','cold']])

Answer 3

data = %w/hot medium cold/.map { |s| [s.capitalize, s] }
= f.select :city_name, Hash[data]

散列[數據]

Answer 4

請在下面找到為我解決的問題

= f.select :city_name, :options => [["Delhi", "Delhi"], ["Mumbai", "Mumbai"], ["New York", "New York"], ["Punjab", "Punjab"]]

：options =>是關鍵...但是文檔為什么沒有提到這一點。 可能是因為gem版本不同。

謝謝大家的幫助。