如何在 Rails 控制器中选择？

Question

现在我有了这样的控制器方法：

     def modelv
    @model = Model.find(:all, :conditions => { :MOD_MFA_ID => params[:man]}) 
    @ct = CountryDesignation.find(:all, :conditions => { :CDS_ID => "110000002"})
    @destext = DesText.find(:all, :conditions => { :TEX_ID => "388555"})
    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @model }
    end
  end

但我希望它看起来像这样：

 def modelv
    @model = Model.find(:all, :conditions => { :MOD_MFA_ID => params[:man]}) 
    @ct = CountryDesignation.find(:all, :conditions => { :CDS_ID => @model.MOD_CDS_ID})
    @destext = DesText.find(:all, :conditions => { :TEX_ID => @ct.CDS_TEX_ID})
    respond_to do |format|
      format.html # show.html.erb
      format.xml  { render :xml => @model }
    end
  end

但是我的模型结构是这样的：

COUNTRY_DESIGNATIONS 有_many 型号

DES_TEXTS 有_many COUNTRY_DESIGNATIONS

制造商有_许多型号

所以如果我选择@model - 它是数组，如果选择@ct - 它是数组（对于每个模型），如果选择@destext - 它是数组。如何正确选择这个。以及如何在视图中显示它？现在我的视图是这样的：

%p#notice= notice

%h3
  - @model.each do |model| 
    %tr
      %p
        mod_id
        %td= model.MOD_ID
        name
        -#%td= model.country_designations.des_texts.TEX_TEXT
      = link_to 'Show model', model
= link_to 'Back', manufacturers_path

我不会看起来像这样：

%p#notice= notice

%h3
  - @model.each do |model| 
    %tr
      %p
        mod_id
        %td= model.MOD_ID
        name
        %td= @destext.TEX_TEXT
      = link_to 'Show model', model

= link_to 'Back', manufacturers_path

Answer 1

如果模型属于_to COUNTRY_DESIGNATIONS 和 COUNTRY_DESIGNATIONS 属于_to DES_TEXTS，则查找应该只返回一个结果。那你就不需要find(:all, ...)，你需要

@model = Model.find(:first, :conditions => { :MOD_MFA_ID => params[:man]}) 
@ct = CountryDesignation.find(:first, :conditions => { :CDS_ID => "110000002"})
@destext = DesText.find(:first, :conditions => { :TEX_ID => "388555"})