軌道命名慣例的麻煩

我想我在我的應用程序中遵循軌道命名約定。但是當我在終端測試代碼中時，我遇到了一些違背命名約定的錯誤。這裏是我的終端會話：軌道命名慣例的麻煩

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'

現在，當我嘗試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

從我的模型：

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

我處於停滯狀態，卡住了，撞我的頭靠牆，等等。任何幫助都會很棒。

Rails的noobie這裏....彷彿這一點並不明顯.....

來源

2011-12-18 tbone

運行時，你得到了同樣的問題'捆EXEC軌console'，而不是'irb'？ – 2011-12-18 18:32:56

完全沒有。有用。你是男人。謝謝！ – tbone 2011-12-18 18:37:27

酷，作爲答案添加，以便您可以標記正確以幫助未來的讀者。 – 2011-12-18 18:45:14

注意到你似乎是在IRB ......相反，我會嘗試在使用活動記錄類時留在軌道控制檯中。

所以開始與

bundle exec rails console

來源

2011-12-18 18:44:51

你所需要的就是一個路口表。見協會has_and_belongs_to_many。

聯結表將存儲某個Neighbourhood和某個CtaTrain之間的鏈接。在這裏，它是CtaLocation，但如果你不打算實際使用這個模型，你甚至可以不定義它。

例如，你可以實現它有三個表（街區，cta_trains和cta_trains_neighbourhoods），只有兩個車型，如：

class Neighbourhood 
    has_and_belongs_to_many :cta_trains 
end 

class CtaTrain 
    has_and_belongs_to_many :neighbourhoods 
end

來源

2011-12-18 18:43:34 thoferon

我需要能夠手動添加關聯到連接模型。在這種情況下，HABTM約定是否會比has_many => through更好？ – tbone 2011-12-18 18:47:41

您仍然可以定義「連接模型」，而其他兩個模型會更清晰。 – thoferon 2011-12-18 18:52:21

好的，謝謝你的提示！ – tbone 2011-12-18 18:55:13

軌道命名慣例的麻煩

回答

相關問題