ruby-on-rails - 在具有自己属性的连接表上使用 accepts_nested_attributes_for - 重复行

Question

我有以下三个模型(Rails 2.3.8)

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

        accepts_nested_attributes_for :incidents, :allow_destroy => true
        accepts_nested_attributes_for :locations, :allow_destroy => true, :reject_if => proc { |attrs| attrs.all? { |k, v| v.blank? } }

    end

   class Incident < ActiveRecord::Base
        belongs_to :outbreak
        belongs_to :location
   end


   class Location < ActiveRecord::Base
 has_many :incidents
 has_many :outbreaks, :through => :incidents

     accepts_nested_attributes_for :incidents, :allow_destroy => true

   end

表单的参数好像没问题

“爆发”=>{"locations_attributes"=>{"0"=>{"lon"=>"-1.39", "placename"=>"wetwe", "hpu_id"=>"15", "postcode"=>"so1 1aa", "region_id"=>"10", "address_1"=>"", "town"=>"Bargate", "address_2"=>"", "address_3"=>"", "lat"=>"50.89"}},"incidents_attributes"=>{"0"=>{"subtype_id"=>"7", "category_id"=>"1", "detail"=>"", "subcategory_id"=>"2"} }

但是当保存爆发时，会在事件表(连接表)中创建 3 行，并在爆发和位置表中创建一行。

Incidents 表中的行未完全由参数填充，如下所示:

id outbreak_id location_id category_id subcategory_id subtype_id detail  created_at    updated_at 

 57 23   NULL     1       2           7                          2010-11-25 14:45:18.385905  2010-11-25 14:45:18.385905 
 58 23   27         NULL       NULL        NULL    NULL           2010-11-25 14:45:18.39828  2010-11-25 14:45:18.39828 
 59 23   27         NULL         NULL     NULL      NULL           2010-11-25 14:45:18.403051  2010-11-25 14:45:18.403051 

这一定是由于参数的格式或多个 accepts_nested_attributes_for 方法 - 我如何才能在事件表中输入包含所有参数信息的一行？

Answer 1

本周到目前为止，我已经第二次回答了我自己的问题 ^^ 这将教会我在放弃和在网上发帖寻求帮助之前付出更多努力，

在查看了我最初的问题后，我仍然没有包含足够的信息来正确回答它 - 这个问题(除了模型的设置)归结为 Outbreak Controller 新方法中的 Outbreak 构造函数，

原始 Outbreaks_controller

def new

    @outbreak = Outbreak.new
    @outbreak.risks.build
    //links locations directly to Outbreak instead of through Incidents
    @outbreak.locations.build
    @outbreak.incidents.build

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @outbreak }
    end
end

修改后的 Outbreaks_controller

def new

    @outbreak = Outbreak.new
    @outbreak.risks.build
    //builds Incidents then a Location through that incident
    @outbreak.incidents.build.build_location

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @outbreak }
    end
end

三个模型的变化

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

        accepts_nested_attributes_for :incidents, :allow_destroy => true


    end

   class Incident < ActiveRecord::Base
        belongs_to :outbreak
        belongs_to :location

        accepts_nested_attributes_for :location, :allow_destroy => true
   end


   class Location < ActiveRecord::Base
       has_many :incidents
       has_many :outbreaks, :through => :incidents

   end

这似乎工作正常 - 还发布了创建操作和主窗体