的ActiveRecord :: Base的＃創建 - 類型錯誤：不能轉換成符號整數

我的ActiveRecord :: Base的＃創建 - 類型錯誤：不能轉換成符號整數

class CreateRoles < ActiveRecord::Migration 
    def change 
    create_table :roles do |t| 
     t.string :name 

     t.timestamps 
    end 
    end 
end

和

class Role < ActiveRecord::Base 
    attr_accessible :name 
    has_many :members, :posts 
end 

class Post < ActiveRecord::Base 
    attr_accessible :content, :title, :role_id 
    belongs_to :role 
end 

class Member < ActiveRecord::Base 
    devise :database_authenticatable, :registerable, 
     :recoverable, :rememberable, :trackable, :validatable, :lockable 

    attr_accessible :role_id, :first_name, :last_name, :email, :password, :password_confirmation, :remember_me 
end

在Rails的控制檯或seeds.rb，I型

Role.create(name: 'guest')

並且得到錯誤

TypeError: can't convert Symbol into Integer 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:35:in `[]' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:35:in `wrap_block_extension' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:22:in `build' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/autosave_association.rb:139:in `build' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/has_many.rb:10:in `build' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations/builder/collection_association.rb:13:in `build' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activerecord-3.2.8/lib/active_record/associations.rb:1195:in `has_many' 
    from /Users/ataylo9/Dropbox/Developer/hamsterdam/app/models/role.rb:3:in `<class:Role>' 
    from /Users/ataylo9/Dropbox/Developer/hamsterdam/app/models/role.rb:1:in `<top (required)>' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `load' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:469:in `block in load_file' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:639:in `new_constants_in' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:468:in `load_file' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:353:in `require_or_load' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:502:in `load_missing_constant' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:192:in `block in const_missing' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in `each' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/activesupport-3.2.8/lib/active_support/dependencies.rb:190:in `const_missing' 
    from (irb):1 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands/console.rb:47:in `start' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands/console.rb:8:in `start' 
    from /usr/local/rvm/gems/ruby-1.9.3-p194/gems/railties-3.2.8/lib/rails/commands.rb:41:in `<top (required)>' 
    from script/rails:6:in `require'

我知道我得到的錯誤，因爲Rails想建立成員和帖子的關係，但不應該只是使這些零。我甚至試着明確地將數組設置爲seed.rb中的nil，但得到了同樣的錯誤。

我什麼都不明白？謝謝！

更新：新增崗位和會員模型參考

來源

2013-01-09 hamsterdam

看起來你分配關係（的has_many：成員：職位），它不存在。你有這樣的模型嗎？模型有這種關係嗎？你可以發佈會員和郵政模式的代碼嗎？

來源

2013-01-10 14:15:37 jizak

我在問題中添加了它們。謝謝！ – hamsterdam

我遇到了在單行中聲明多個'has_many'關係的問題。請參閱下面的@jizak參考答案，它幫助我識別此問題 –

我使用相同的模型創建了相同的項目。而我發現這種描述關係發生那種錯誤。

class Role < ActiveRecord::Base 
    attr_accessible :name 
    has_many :members, :posts 
end

我嘗試這樣做：

和一切正常。我不知道爲什麼，但看起來像has_many：帖子，：成員發生的問題。但是你可以用不同的方式來解決這個問題。

來源

2013-01-11 08:57:42 jizak

jizak的答案是什麼幫助推動我在正確的方向，找到解決方案，以我自己的問題。起初，我試圖添加多個「項目」到一個單一的has_many，如上面的例子：

has_many :members, :posts

我的Rails控制檯遊戲我同樣的錯誤 - 「類型錯誤：無法轉換成符號整數。「所以我把它分成兩條不同的路線：

has_many :members
has_many :posts

現在它工作正常。我猜想我試圖有點太聰明，思考關聯（has_many）會類似於attr_accessor/writer/reader - 可以在單個attr_x（或在這種情況下，has_many）中添加多個東西。 Rails並非如此（據我所知） - 每個關聯都需要自己的單獨聲明。

來源

2013-03-28 15:15:06 Fluffy

這有助於我的'TypeError：無法將符號轉換爲整數'。謝謝！ – Legat

的ActiveRecord :: Base的＃創建 - 類型錯誤：不能轉換成符號整數

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