Ruby on rails 3 如何显示相关表中的说明字段

刚开始玩Ruby（没有IT背景），到现在为止玩得还不错。但两天以来，我被困在这里，不明白出了什么问题。。。非常感谢你帮我解决这个问题！！情况如下：

我创建了一个包含以下列的currencymaster表：

currmasdesc:string

，

currmasiso:string

。 我创建了一个包含以下列的currencyrate表：

currratemasteridd:integer

，

currratemasteridc:integer

，

currraterate:decimal

，

currratedate:date

。其中，

currratemasteridd

列反映主导货币，

currratemasteridc

列反映转换后的货币，以生成组合货币对

models/currencymaster.rb如下所示：

class Currencymaster < ActiveRecord::Base
  has_many :CurrencyRateDom, :class_name => "Currencyrate", :foreign_key => "CurrRateMasterIDD" 
  has_many :CurrencyRateConv, :class_name => "Currencrate", :foreign_key => "CurrRateMasterIDC"
end

class Currencyrate < ActiveRecord::Base
  belongs_to :CurrencyDominant, :class_name => 'Currencymaster' , :foreign_key => "CurrRateMasterIDD", :validate => true
  belongs_to :CurrencyConverted, :class_name => 'Currencymaster' , :foreign_key => "CurrRateMasterIDC", :validate => true
end

class CurrencyratesController < ApplicationController
  # GET /currencyrates
  # GET /currencyrates.json
  def index
    @currencyrates = Currencyrate.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @currencyrates }
    end
  end

  # GET /currencyrates/1
  # GET /currencyrates/1.json
  def show
    @currencyrate = Currencyrate.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @currencyrate }
    end
  end
end

class Currencymaster“Currencyrate”，：foreign\u key=>“currencyMasterIDD”
有很多：CurrencyRateConv，：class\u name=>“currencyrate”，：foreign\u key=>“currencyratemasteridc”
结束

models/currencyrate.rb如下所示：

class Currencymaster < ActiveRecord::Base
  has_many :CurrencyRateDom, :class_name => "Currencyrate", :foreign_key => "CurrRateMasterIDD" 
  has_many :CurrencyRateConv, :class_name => "Currencrate", :foreign_key => "CurrRateMasterIDC"
end

class Currencyrate < ActiveRecord::Base
  belongs_to :CurrencyDominant, :class_name => 'Currencymaster' , :foreign_key => "CurrRateMasterIDD", :validate => true
  belongs_to :CurrencyConverted, :class_name => 'Currencymaster' , :foreign_key => "CurrRateMasterIDC", :validate => true
end

class CurrencyratesController < ApplicationController
  # GET /currencyrates
  # GET /currencyrates.json
  def index
    @currencyrates = Currencyrate.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @currencyrates }
    end
  end

  # GET /currencyrates/1
  # GET /currencyrates/1.json
  def show
    @currencyrate = Currencyrate.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @currencyrate }
    end
  end
end

class Currencyrate'Currencymaster'，：foreign\u key=>“CurrencyMasterIDD”，：validate=>true
属于：CurrencyConverted，：class\u name=>Currencymaster'，：foreign\u key=>CurrencyMasterIDC'，：validate=>true
结束

controllers/currencyrates\u controller.rb如下所示：

class Currencymaster < ActiveRecord::Base
  has_many :CurrencyRateDom, :class_name => "Currencyrate", :foreign_key => "CurrRateMasterIDD" 
  has_many :CurrencyRateConv, :class_name => "Currencrate", :foreign_key => "CurrRateMasterIDC"
end

class Currencyrate < ActiveRecord::Base
  belongs_to :CurrencyDominant, :class_name => 'Currencymaster' , :foreign_key => "CurrRateMasterIDD", :validate => true
  belongs_to :CurrencyConverted, :class_name => 'Currencymaster' , :foreign_key => "CurrRateMasterIDC", :validate => true
end

class CurrencyratesController < ApplicationController
  # GET /currencyrates
  # GET /currencyrates.json
  def index
    @currencyrates = Currencyrate.all

    respond_to do |format|
      format.html # index.html.erb
      format.json { render json: @currencyrates }
    end
  end

  # GET /currencyrates/1
  # GET /currencyrates/1.json
  def show
    @currencyrate = Currencyrate.find(params[:id])

    respond_to do |format|
      format.html # show.html.erb
      format.json { render json: @currencyrate }
    end
  end
end

class currencyteratescontroller

现在是我的问题，我无法在view/currencyrates/index.html.erb中显示相关的

currencymaster.currmasiso

，而不是存储在表currencyrates中的

currratemasteridd

&

currratemasteridc

---

我希望在这个问题上所有的信息都是可用的，否则请让我知道什么时候需要其他信息。再次感谢

你为什么不遵守惯例

您应该创建一个

CurrencyMaster

类，不要在列名中重复“currmas”或“currrate”。不要覆盖外键。。。您的代码应该如下所示：

class CurrencyMaster < ActiveRecord::Base
  has_many :currency_rate_doms
  has_many :currency_rate_convs
end

class CurrencyMaster

你的其他课也是这样。Rails使用“约定优先于配置”原则，之后会更好

---

欢迎来到精彩的ruby/rails世界。

感谢@Dougui的快速回复。我之所以没有遵循约定（正如我现在看到的）是因为我没有很好地理解它们，我想…也许我可以更好地重新启动这个项目…这是互联网上的很多很好的教程。看这个：。（你能站起来认可我的答案吗？）好的，我已经用建议的模型约定和数据库列重新启动了该项目，但仍然想知道如何在currencyrates视图中显示ISO代码。在ruby on rails方法中，我要做什么才能启用此功能？再次感谢！