針對論壇的未定義方法`作用域'：模塊

我一直在根據forum monster demo開發一個簡單的論壇。我目前正在嘗試從rails 3.0.9更新到3.2.11的應用程序。當我加載應用程序，我得到一個未定義的方法`作用域」的論壇：模塊針對論壇的未定義方法`作用域'：模塊

Extracted source (around line #13): 
10:   <%= link_to "Delete Category", category_path(category), :confirm => "Are you sure you want to delete this category?", :method => :delete if can? :manage, category %> 
11:  </span> 
12:  </div> 
13:  <% if category.forums.size > 0 %> 
14:  <div> 
15:  <table> 
16:   <tr class="smaller">

這是我的論壇MODLE

class Forum < ActiveRecord::Base 

    # Associations 
    has_many :topics, :dependent => :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

以下是我從控制檯

打探得知

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 `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 
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 `<top (required)>' 
    from script/rails:6:in `require' 
    from script/rails:6:in `<main>' 
irb(main):006:0>

在此先感謝您煽動此問題的性質。

來源

2013-01-18 Rick Barrette

一些範圍的東西在Rails 3.1本身結帳時不推薦使用[this]（http://m.onkey.org/active-record-query-interface） – nishanthan

你的「論壇」模型類是在你的配置命名完全一樣的模塊/ application.rb中

重命名模型或應用程序。

來源

2013-01-18 16:41:11 cthulhu

這就是它的謝謝！我對Ruby和Rails真的很陌生，並沒有意識到我無法將應用程序命名爲模型。 –

針對論壇的未定義方法`作用域'：模塊

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