我有 ruby on rails 3.2.14 的项目。我有 2 个名为“国家”和“用户”的表。在“用户”表中,FK 名为“countries_id”。
在模型上,我将表关系设置为:
在 countries.rb
中,我设置了如下关系:
class Countries < ActiveRecord::Base
self.primary_key = "id"
has_many :users, :dependent => :destroy # plural
end
并在 users.rb 中:
class Users < ActiveRecord::Base
self.primary_key = "id"
belongs_to :countries,
:class_name => "Countries",
:foreign_key => "countries_id"
end
当我想检查复数关系时,它没有.. 我输入如下所示的 Rails 控制台命令
c=Countries.find_by_id(1)
然后当我输入命令 u=c.users
时,出现一些错误
错误:
c=Countries.find_by_id(1)
Countries Load (0.3ms) SELECT `countries`.* FROM `countries` WHERE `countries`.`id` = 1 LIMIT 1
=> #<Countries id: 1, code: "IND", name: "Indonesia", created_at: "2014-02-17 09:18:11", updated_at: "2014-02-17 09:18:11">
1.9.3-p484 :012 > u=c.users
NameError: uninitialized constant Countries::User
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/inheritance.rb:111:in `compute_type'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/reflection.rb:172:in `klass'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/associations/association.rb:118:in `klass'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/associations/association.rb:171:in `find_target?'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/associations/collection_association.rb:334:in `load_target'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/associations/collection_proxy.rb:44:in `load_target'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/activerecord-3.2.14/lib/active_record/associations/collection_proxy.rb:87:in `method_missing'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/railties-3.2.14/lib/rails/commands/console.rb:47:in `start'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/railties-3.2.14/lib/rails/commands/console.rb:8:in `start'
from /home/vinra/.rvm/gems/ruby-1.9.3-p484@rails3.2/gems/railties-3.2.14/lib/rails/commands.rb:41:in `<top (required)>'
from script/rails:6:in `require'
from script/rails:6:in `<main>'
1.9.3-p484 :013 > ^C
1.9.3-p484 :013 >
我真的希望有人知道我的问题, 无论如何,谢谢你,抱歉我的英语不好:)
最佳答案
您应该更改代码中的很多内容:
app/models/country.rb
class Country < ActiveRecord::Base
has_many :users, :dependent => :destroy
end
app/models/user.rb
class Users < ActiveRecord::Base
belongs_to :country,
:foreign_key => "countries_id"
end
然后像这样使用它:
country = Country.find(1)
p country.users
关于ruby-on-rails - 检查模型上的关系表, rails 上的 ruby ,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/21847509/