未定义的Friendly_id实现方法

Question

这就是我的 Plan.rb 的样子：

class Plan < ActiveRecord::Base

  has_many :users
  has_friendly_id :plan, :use_slug => true

end

User.rb

class User < ActiveRecord::Base

#There is other stuff in here, but I stripped it out for brevity purposes.

  has_and_belongs_to_many :projects
  has_many :stages
  has_many :uploads
  has_many :comments
  has_many :assignments
  has_many :roles, :through => :assignments
  belongs_to :plan


end

这是我收到的错误消息：

'ruby-1.9.2-p0 > Plan.create(:name => "First_Test", :storage => "100")
NoMethodError: undefined method `plan' for #<Plan:0x00000102b8a2d8>
    /gemms/ruby-1.9.2-p0/gems/activemodel-3.0.3/lib/active_model/attribute_methods.rb:364:in `method_missing'
    /gemms/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/attribute_methods.rb:46:in `method_missing'
    /gems/ruby-1.9.2-p0/gems/friendly_id-3.2.0/lib/friendly_id/slugged.rb:82:in `slug_text'
    /gems/ruby-1.9.2-p0/gems/friendly_id-3.2.0/lib/friendly_id/active_record_adapter/slugged_model.rb:49:in `build_a_slug'
    /gems/ruby-1.9.2-p0/gems/activesupport-3.0.3/lib/active_support/callbacks.rb:419:in `_run_save_callbacks'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/callbacks.rb:277:in `create_or_update'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/persistence.rb:39:in `save'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/validations.rb:43:in `save'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/attribute_methods/dirty.rb:21:in `save'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:237:in `block (2 levels) in save'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:289:in `block in with_transaction_returning_status'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/connection_adapters/abstract/database_statements.rb:139:in `transaction'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:204:in `transaction'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:287:in `with_transaction_returning_status'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:237:in `block in save'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:248:in `rollback_active_record_state!'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/transactions.rb:236:in `save'
    /gems/ruby-1.9.2-p0/gems/activerecord-3.0.3/lib/active_record/base.rb:498:in `create'
    from (irb):3
    /gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/console.rb:44:in `start'
    /gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands/console.rb:8:in `start'
    /gems/ruby-1.9.2-p0/gems/railties-3.0.3/lib/rails/commands.rb:23:in `<top (required)>'
    from script/rails:6:in `require'
    from script/rails:6:in `<main>'

不确定我在这里做错了什么，但我无法创建任何新的“计划”。

Answer 1

您的数据库的 plans 表中似乎没有 plan 列。除了将 has_Friendly_id 语句添加到模型中之外，您是否还创建并运行迁移以将 plan 字段添加到数据库中？

Answer 2

如果您已将Friendly_id从版本3升级到4，您也可能会收到此错误（未定义方法“has_Friendly_id”）。

命令“has_Friendly_id”已被“Friendly_id”替换 - 请在此处查看如何升级：

http://rubydoc.info/github/norman/Friendly_id/master/file/WhatsNew.md

注意：您还需要创建迁移以向表中添加新的 slug 列。