Question

我有3个表：用户，大学和校园。他们的模型如下：

class User < ActiveRecord::Base
  belongs_to :university
end

class Campus < ActiveRecord::Base
  belongs_to :university
end

class University < ActiveRecord::Base
  has_many :users, dependent: :destroy
  has_many :campuses, dependent: :destroy
end

但是我从大学获得校园协会时遇到了问题。检查一下：

1.9.2p290 :012 > u = University.find(3)
 => #<University id: 3, name: "myuni", email: "uni.com", created_at: "2012-06-04 03:48:59", updated_at: "2012-06-13 03:22:18"> 
1.9.2p290 :013 > u.users
 => [#<User id: 21, name: "myname", email: "myemail", password: "asdfgh", created_at: "2012-08-10 23:42:40", updated_at: "2012-08-10 23:42:40", university_id: 3>] 
1.9.2p290 :014 > u.campus
NoMethodError: undefined method `campus' for #<University:0x000000031c8a10>
        from /home/mari/.rvm/gems/ruby-1.9.2-p290/gems/activemodel-3.0.10/lib/active_model/attribute_methods.rb:392:in `method_m
issing'
        from /home/mari/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.0.10/lib/active_record/attribute_methods.rb:46:in `method_
missing'
        from (irb):14
        from /home/mari/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.10/lib/rails/commands/console.rb:44:in `start'
        from /home/mari/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.10/lib/rails/commands/console.rb:8:in `start'
        from /home/mari/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.0.10/lib/rails/commands.rb:23:in `<top (required)>'
        from script/rails:6:in `require'
        from script/rails:6:in `<main>'

这可能是由于校园的多元化，但I haven't been able to fix that either。所以我尝试了u.campu，u.campuses，u.campues，但我得到了相同的“NoMethodError”。

有什么建议吗？感谢

Answer 1

似乎在添加：

  set_table_name 'campus'

到模型：campus.rb修复它

Answer 2

语法为u.campuses或u.campuses.first

我还将表格组织为：

class User < ActiveRecord::Base
  belongs_to :campus
end

class Campus < ActiveRecord::Base
  has_many :users, dependent: :destroy
  belongs_to :university
end

class University < ActiveRecord::Base
  has_many :campuses, dependent: :destroy
end

关系模型university.campus的Method_missing

2 个答案: