论坛的未定义方法`scoped’：模块

这是我的论坛模型

 class Forum  :destroy has_many :posts, :through => :topics belongs_to :category # Accessors attr_accessible :title, :description, :state, :position, :category_id # Scopes default_scope :order => :'position ASC' # Validations validates :title, :presence => true validates :description, :presence => true validates :category_id, :presence => true end 

这是我在控制台中探索的经验

 ricky ~/forum $ rails console Loading development environment (Rails 3.2.11) irb(main):001:0> Category.all.size Category Load (0.4ms) SELECT `categories`.* FROM `categories` ORDER BY position ASC => 2 irb(main):002:0> Category.all.each do |cat| irb(main):003:1* puts cat.forums.size irb(main):004:1> end Category Load (0.6ms) SELECT `categories`.* FROM `categories` ORDER BY position ASC NoMethodError: undefined method `scoped' for Forum:Module from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.11/lib/active_record/associations/association.rb:123:in `target_scope' from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.11/lib/active_record/associations/association.rb:87:in `scoped' from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.11/lib/active_record/associations/has_many_association.rb:41:in `count_records' from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.11/lib/active_record/associations/collection_association.rb:261:in `size' from /usr/lib/ruby/gems/1.9.1/gems/activerecord-3.2.11/lib/active_record/associations/collection_proxy.rb:46:in `size' from (irb):3:in `block in irb_binding' from (irb):2:in `each' from (irb):2 from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start' from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start' from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands.rb:41:in `' from script/rails:6:in `require' from script/rails:6:in `' irb(main):005:0> puts Forum.all.size NoMethodError: undefined method `all' for Forum:Module from (irb):5 from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:47:in `start' from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands/console.rb:8:in `start' from /usr/lib/ruby/gems/1.9.1/gems/railties-3.2.11/lib/rails/commands.rb:41:in `' from script/rails:6:in `require' from script/rails:6:in `' irb(main):006:0> 

提前感谢任何有关此问题性质的煽动。

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