我当前的工作环境是Rails 2.3.8 （导致公司未迁移到Rails 3的各种原因）。我正在尝试通过AJAX调用更新多模型表单的元素-
这个想法是根据用户选择或填写其他字段的方式替换某些下拉菜单。

我以前已经设法通过使用基于非表单的部分来实现此目的-
我现在的问题是，当部分基于form_for和fields_for时，会重现select下拉列表的AJAX更新。

对不起，下面的文字-我已经尝试过尽可能地减少它（代码本身确实可以在我的测试站点上工作）。

如何在爆发控制器中生成表单构建器元素，然后将其传递给category部分以代替identity_form？

任何指针都很棒：D

楷模

class Outbreak < ActiveRecord::Base
        has_many :incidents, :dependent => :destroy
        has_many :locations, :through => :incidents

     accepts_nested_attributes_for :locations, :allow_destroy => true, :reject_if => :all_blank
     accepts_nested_attributes_for :incidents, :allow_destroy => true, :reject_if => :all_blank
end

class Incident < ActiveRecord::Base
    belongs_to :outbreak
    belongs_to :location
    belongs_to :category
    belongs_to :subcategory
    belongs_to :subtype

end

class Location < ActiveRecord::Base
    has_many :incidents, :dependent => :destroy
     has_many :outbreaks, :thorugh => incidents
end

观看次数

_形成

<% form_for(@outbreak, :html => {:multipart => true}) do |form| %>

  <%= render :partial => 'outbreak_type_select', :locals => {:outbreak_types => @outbreak_types, :f => form } %>
   <% form.fields_for :incidents do |incident_form| %>
      <%= render :partial => 'category_select', :locals => {:categories => @categories, :incident_form => incident_form} %>
      <%= render :partial => 'subcategory_select', :locals => { :subcategories => @subcategories, :incident_form => incident_form } %>

   <% end %>
<% end %>

_outbreak_type_select

<% with_str = "'outbreak_type=' + value " %>
<% if @outbreak.id %>
<% with_str << "+ '&id=' + #{outbreak.id}" %>
<% end %>
<%= f.collection_select(:outbreak_type, @outbreak_types, :property_value, :property_value, {}, {:onchange => "#{remote_function(:url  => { :action => "update_select_menus"}, :with => with_str)}"}  ) %>

_category_select

调用update_select_menus之后如何生成事故表单

<%= incident_form.collection_select( :category_id, @categories, :id, :name, {:prompt   => "Select a category"}, {:onchange => "#{remote_function(:url  => { :action => "update_subcategory"}, :with => "'category_id='+value")}"}) %>

RJS

   begin
    page.replace_html 'outbreak_transmission_div', :partial => 'outbreaks/transmission_mode_select', :locals => {:transmission_modes => @transmission_modes }
   rescue
    page.insert_html :bottom, 'ajax_error', '<p>Error :: transmission modes update select</p>'
    page.show 'ajax_error'
   end
   begin
    page.replace_html 'incident_category_select', :partial => 'outbreaks/category_select', :locals => { :categories => @categories }  
   rescue
    page.insert_html :bottom, 'ajax_error', '<p>Error :: incident category update select</p>'
    page.show 'ajax_error'
   end

控制器

暴发

    def new
        @outbreak = Outbreak.new

        @outbreak.incidents.build
        @outbreak.locations.build

        #just the contents for the dropdowns
        @categories = Category.find(:all, :conditions => {:outbreak_type => "FOODBORNE"}, :order => "outbreak_type ASC")
        @subcategories = Subcategory.find(:all, :order => "category_id ASC")

    end

   def update_select_menus
      @outbreak_type = params[:outbreak_type].strip
      if params[:id]
        @outbreak = Outbreak.find(params[:id])
      else
        @outbreak = Outbreak.new
        @outbreak.incidents.build
              @outbreak.locations.build       
      end

      if @outbreak_type == "FOODBORNE"
          ob_type_query = "OUTBREAKS:TRANSMISSION_MODE:" << @outbreak_type
          @transmission_modes = Property.find(:all, :conditions => {:field => ob_type_query})

          ob_type_query = "INVESTIGATIONS:CATEGORY:" << @outbreak_type
          @sample_types = Property.find(:all, :conditions => {:field => ob_type_query})
          @categories = Category.find(:all, :conditions => { :outbreak_type => "FOODBORNE"})
          @subcategories = Subcategory.find(:all, :conditions => { :category_id => @categories.first.id})
          @subtypes = Subtype.find(:all, :conditions => { :subcategory_id => @subcategories.first.id})
      elsif @outbreak_type == "NON-FOODBORNE"
          ob_type_query = "OUTBREAKS:TRANSMISSION_MODE:" << @outbreak_type
          @transmission_modes = Property.find(:all, :conditions => {:field => ob_type_query})

          ob_type_query = "INVESTIGATIONS:CATEGORY:" << @outbreak_type
          @sample_types = Property.find(:all, :conditions => {:field => ob_type_query})
          @categories = Category.find(:all, :conditions => { :outbreak_type => "NON-FOODBORNE"})
          @subcategories = Subcategory.find(:all, :conditions => { :category_id => @categories.first.id})
          @subtypes = Subtype.find(:all, :conditions => { :subcategory_id => @subcategories.first.id})
     end

     respond_to do |format|
          format.html
          format.js
      end

  end