问题描述
我认为我在我的应用程序中遵循了Rails的命名约定.但是，当我使用终端测试代码时，会遇到一些违反命名约定的错误.这是我的终端会话:
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
根据我的模型:
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，被卡住，把头撞在墙上，等等.任何帮助都是很棒的.
将noobie推到这里....好像这一点并不明显.....
注意到您似乎在IRB中……相反，在使用活动记录类时，我会尝试停留在rails控制台中. /p>
所以从
开始bundle exec rails console
I think I have followed the rails naming conventions in my app. But when I am in the terminal testing code I am coming across some errors that go against naming conventions. Here is my terminal session:
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'
Now when I try 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
From my models:
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
I am at a standstill, stuck, banging my head against the wall, etc. Any help would be fabulous.
Rails noobie here....as if this point is not obvious.....
Noticed that you appear to be in IRB... Instead, I'd try to stay in the rails console when working with your active-record classes.
so start that with
bundle exec rails console
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