ruby-on-rails - 用于在 Rails 中序列化数据的语法

Question

根据 Rails 文档http://api.rubyonrails.org/classes/ActiveRecord/Base.html，我可以使用 serialize 方法将数组存储在数据库中

 class User < ActiveRecord::Base
      serialize :preferences, Hash
    end

    user = User.create(:preferences => %w( one two three ))

在我极小的应用程序中，我对 Question 模型的 answers 列进行了序列化，因为会有多种可能的答案选择

class Question < ActiveRecord::Base
  attr_accessible :question, :link, :answers, :correctanswers

  serialize :answers

end

试图为数据库播种以对其进行测试，我这样做了...

Question.create!( question: "what is R's favorite color", answers: "a" => %w( red green blue ), correctanswer: "blue", link => "http://janesblog.com")

但是，rake db.seed 因各种错误而中止，表明我的语法错误

/Users/mm/Sites/ljk/db/seeds.rb:17: syntax error, unexpected tASSOC, expecting ')'
...avorite color", answers: "a" => %w( red green blue ), correc...
...                               ^
/Users/mm/Sites/ljk/db/seeds.rb:17: syntax error, unexpected ',', expecting $end
...s: "a" => %w( red green blue ), correctanswer: "blue", link ...

任何人都可以帮助使用正确的语法吗？桌子

class CreateQuestions < ActiveRecord::Migration
  def change
    create_table :questions do |t|

      t.string :question
      t.string :link
      t.text   :answers
      t.string :correctanswer


      t.timestamps
    end
  end
end

Answer 1

这不是有效的红宝石：

answers: "a" => %w( red green blue )

你可以这样做：

answers: { "a" => %w( red green blue ) }

Answer 2

我想你想要：

Question.create!(
  question: "what is R's favorite color",
  answers: %w( red green blue ),
  correctanswer: "blue",
  link: "http://janesblog.com"
)