我目前的工作环境是 Rails 2.3.8（我的公司没有迁移到 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 - 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列表。
我以前设法通过使用非基于表单的部分来完成这项工作 - 我现在遇到的问题是当部分基于 form_for 和 fields_for 时，重现选择下拉列表的 AJAX 更新。
很抱歉下面的文字墙 - 我试图尽可能地减少它（代码本身在我的测试站点上确实有效）。
如何在爆发控制器中生成表单构建器元素，然后将其传递给部分类别以代替 event_form？
任何指针都会很棒：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
意见
_形式
<% 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 后如何生成 event_form
<%= 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
爆发
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