1

我有一个模型，其中包含一个名为“状态”的字段。我已将其更改为 DB 中的字符串类型。我还在 AASM 中使用枚举。
这是我的代码：

class Card < ActiveRecord::Base
  include AASM

  enum status: {
    default: 0,
    published: 1,
    deleted: 2
  }

  aasm column: :status, enum: true, skip_validation_on_save: true, no_direct_assignment: true do
    state :default, initial: true
    state :published
    state :deleted

    event :publish do
      transitions from: :default, to: :published
    end

    event :delete do
      transitions from: :published, to: :deleted
    end
  end
end

我这样应用它：

Card card = Card.first
card.publish

无论我打电话card.publish还是card.delete，我都会收到这样的错误：

NoMethodError: undefined method `name' for nil:NilClass
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/core/state.rb:15:in `=='
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/instance_base.rb:61:in `block in state_object_for_name'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/instance_base.rb:61:in `each'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/instance_base.rb:61:in `find'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/instance_base.rb:61:in `state_object_for_name'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/aasm.rb:62:in `aasm_fire_event'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/persistence/active_record_persistence.rb:175:in `block in aasm_fire_event'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `block in transaction'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/transaction.rb:188:in `within_new_transaction'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/activerecord-4.2.0/lib/active_record/connection_adapters/abstract/database_statements.rb:213:in `transaction'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/activerecord-4.2.0/lib/active_record/transactions.rb:220:in `transaction'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/persistence/active_record_persistence.rb:175:in `aasm_fire_event'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/aasm-4.1.1/lib/aasm/base.rb:81:in `block in event'
    from (irb):13
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/console.rb:110:in `start'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/console.rb:9:in `start'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:68:in `console'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands/commands_tasks.rb:39:in `run_command!'
    from /Users/MadisonRong/.rvm/gems/ruby-2.0.0-p598/gems/railties-4.2.0/lib/rails/commands.rb:17:in `<top (required)>'
    from bin/rails:4:in `require'
    from bin/rails:4:in `<main>'2.0.0-p598 :014 >

这让我困惑了几天。任何帮助将不胜感激。

4

1 回答 1

0

难道不应该

enum status: [
  :default,
  :published,
  :deleted
]

? 如果这没有帮助，请在 GitHub 上打开一个问题，我会仔细研究它。

于 2015-06-18T20:52:24.447 回答