Ruby on rails 有很多：通过关联错误

我正在尝试设置一个简单的has\u many:through=>关联

我有三种型号。user.rb、icon.rb和user_icon.rb

user.rb

class User < ActiveRecord::Base
  has_many :user_icons
  has_many :icons, :through => :user_icons
end

我得到这个错误

1.9.2-p290 :002 > User.first.icons
ActiveRecord::HasManyThroughSourceAssociationNotFoundError: Could not find the source association(s) :icon or :icons in model UserIcon. Try 'has_many :icons, :through => :user_icons, :source => <name>'. Is it one of :User or :Icon?
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/reflection.rb:517:in `check_validity!'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations/association.rb:27:in `initialize'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations/collection_association.rb:24:in `initialize'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations.rb:159:in `new'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations.rb:159:in `association'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations/builder/association.rb:41:in `block in define_readers'
    from (irb):2
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in `start'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in `start'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:40:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

1.9.2-p290:002>User.first.icons
ActiveRecord:：HasManyThroughSourceAssociationNotFoundError:在model UserIcon中找不到源关联：图标或：图标。试试“has_many:icons，：through=>：user_icons，：source=>”。它是：用户还是：图标之一？
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active\u record/reflection.rb:517:在“检查有效性”中
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active\u record/associations/association.rb:27:in“initialize”中
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active\u record/associations/collection\u association.rb:24:in'initialize'
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations.rb:159:in“new”
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations.rb:159:in“association”
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active\u record/associations/builder/association.rb:41:在“定义中的块”中
来自（irb）：2
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in'start'
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in'start'
from/Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:40:in`'
来自脚本/rails:6:in'require'
来自脚本/rails:6:in`'

---

知道我做错了什么吗

您的问题在于用户图标模型中的关联。案例在定义关联时很重要。如果您将模型更改为小写，它应该可以工作

class UserIcon < ActiveRecord::Base
  belongs_to :user
  belongs_to :icon

class用户图标

您的问题在于用户图标模型中的关联。案例在定义关联时很重要。如果您将模型更改为小写，它应该可以工作

class UserIcon < ActiveRecord::Base
  belongs_to :user
  belongs_to :icon

class用户图标

1.9.2-p290 :002 > User.first.icons
ActiveRecord::HasManyThroughSourceAssociationNotFoundError: Could not find the source association(s) :icon or :icons in model UserIcon. Try 'has_many :icons, :through => :user_icons, :source => <name>'. Is it one of :User or :Icon?
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/reflection.rb:517:in `check_validity!'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations/association.rb:27:in `initialize'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations/collection_association.rb:24:in `initialize'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations.rb:159:in `new'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations.rb:159:in `association'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/activerecord-3.1.1/lib/active_record/associations/builder/association.rb:41:in `block in define_readers'
    from (irb):2
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:45:in `start'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands/console.rb:8:in `start'
    from /Users/jon/.rvm/gems/ruby-1.9.2-p290/gems/railties-3.1.1/lib/rails/commands.rb:40:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

class UserIcon < ActiveRecord::Base
  belongs_to :user
  belongs_to :icon