填充動態選擇菜單與軌道數據庫中的記錄

Question

我試圖根據用戶在上一個菜單中的選擇來填充選擇菜單。我只使用一種模式存儲用戶正在過濾的所有記錄。我的問題是隻獲得唯一的記錄，而不是所有的記錄基於以前的選擇。

schools_controller

class SchoolsController < ApplicationController 
    def region 
    @user = current_user 
    @regions = School.select(:region).uniq.order(:region) 
    end 

    def municipalities 
    @municipalities = School.where(:region => params[:region]).uniq 



    end 
end 

模型

# == Schema Information 
# 
# Table name: schools 
# 
# id   :integer   not null, primary key 
# region  :string(255) 
# municipality :string(255) 
# school  :string(255) 
# created_at :datetime   not null 
# updated_at :datetime   not null 
# 

class School < ActiveRecord::Base 
    attr_accessible :region, :municipality, :school 
    has_many :users 
end 

regions.html.erb

<%= form_tag 'municipalities' do %> 
<p><%= select_tag(:region, options_from_collection_for_select(@regions, 'region', 'region')) %> 
</p><p> 
<%= submit_tag 'Nästa', :class=> 'btn btn-primary' %> 
    </p> 
<% end %> 

municipalities.html.erb

<%= form_tag 'schools' do %> 
<p><%= select_tag(:municipalities, options_from_collection_for_select(@municipalities ,:municipality ,:municipality)) %> 
</p><p> 
<%= submit_tag 'Nästa', :class=> 'btn btn-primary' %> 
    </p> 
<% end %> 

Answer 1

看看Ryan的動態選擇菜單http://railscasts.com/episodes/88-dynamic-select-menus-revised railscast。或者看看dynamic_form gem。

兩者都有訣竅，dyanic_form gem會像您所期望的那樣需要很多編碼，並且使用更多的coffescript而不是javascript