轨道命名惯例的麻烦

我想我在我的应用程序中遵循轨道命名约定。但是当我在终端测试代码中时，我遇到了一些违背命名约定的错误。这里是我的终端会话：轨道命名惯例的麻烦

irb(main):010:0> a = _ 
=> #<Neighborhood id: 24, name: "Lincoln Park", created_at: "2011-12-03 20:29:00", updated_at: "2011-12-03 21:08:47", minlat: 41.91092, maxlat: 41.925658, minlng: -87.648761, maxlng: -87.636117> 
irb(main):011:0> a.cta_trains 
NoMethodError: undefined method `cta_trains' for #<Neighborhood:0x007fd666ee61e8> 
    from /usr/local/Cellar/ruby/1.9.2-p290/lib/ruby/gems/1.9.1/gems/activemodel-3.1.1/lib/active_model/attribute_methods.rb:385:in `method_missing'

现在，当我尝试a.CtaTrains：

irb(main):012:0> a.CtaTrains 
    CtaTrain Load (0.4ms) SELECT "cta_trains".* FROM "cta_trains" INNER JOIN "cta_locations" ON "cta_trains"."id" = "cta_locations"."CtaTrain_id" WHERE "cta_locations"."neighborhood_id" = 24 
SQLite3::SQLException: no such column: cta_locations.CtaTrain_id: SELECT "cta_trains".* FROM "cta_trains" INNER JOIN "cta_locations" ON "cta_trains"."id" = "cta_locations"."CtaTrain_id" WHERE "cta_locations"."neighborhood_id" = 24 
ActiveRecord::StatementInvalid: SQLite3::SQLException: no such column: cta_locations.CtaTrain_id: SELECT "cta_trains".* FROM "cta_trains" INNER JOIN "cta_locations" ON "cta_trains"."id" = "cta_locations"."CtaTrain_id" WHERE "cta_locations"."neighborhood_id" = 24

从我的模型：

class Neighborhood < ActiveRecord::Base 

    has_many :cta_trains, :through => :cta_locations 
    has_many :cta_locations, :foreign_key => :neighborhood_id 

end 

class CtaTrain < ActiveRecord::Base 

    has_many :neighborhoods, :through => :cta_locations 
    has_many :cta_locations, :foreign_key => :cta_train_id 

end 

class CtaLocation < ActiveRecord::Base 

    belongs_to :neighborhood 
belongs_to :cta_train 

end

我处于停滞状态，卡住了，撞我的头靠墙，等等。任何帮助都会很棒。

Rails的noobie这里....仿佛这一点并不明显.....

来源

2011-12-18 tbone

运行时，你得到了同样的问题'捆EXEC轨console'，而不是'irb'？ – 2011-12-18 18:32:56

完全没有。有用。你是男人。谢谢！ – tbone 2011-12-18 18:37:27

酷，作为答案添加，以便您可以标记正确以帮助未来的读者。 – 2011-12-18 18:45:14

注意到你似乎是在IRB ......相反，我会尝试在使用活动记录类时留在轨道控制台中。

所以开始与

bundle exec rails console

来源

2011-12-18 18:44:51

你所需要的就是一个路口表。见协会has_and_belongs_to_many。

联结表将存储某个Neighbourhood和某个CtaTrain之间的链接。在这里，它是CtaLocation，但如果你不打算实际使用这个模型，你甚至可以不定义它。

例如，你可以实现它有三个表（街区，cta_trains和cta_trains_neighbourhoods），只有两个车型，如：

class Neighbourhood 
    has_and_belongs_to_many :cta_trains 
end 

class CtaTrain 
    has_and_belongs_to_many :neighbourhoods 
end

来源

2011-12-18 18:43:34 thoferon

我需要能够手动添加关联到连接模型。在这种情况下，HABTM约定是否会比has_many => through更好？ – tbone 2011-12-18 18:47:41

您仍然可以定义“连接模型”，而其他两个模型会更清晰。 – thoferon 2011-12-18 18:52:21

好的，谢谢你的提示！ – tbone 2011-12-18 18:55:13

轨道命名惯例的麻烦

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