Rails 5：ActiveRecord集合index_by [英] Rails 5: ActiveRecord collection index_by

问题描述

使用索引方法将应用程序升级到Rails 5。问题是它没有增加到下一个ActiveRecord集合记录。下面的代码用于在Rails 4.0中工作。

Upgraded app to Rails 5 using the index method. The issue is that it is not incrementing to the next ActiveRecord collection record. The below code below use to work in Rails 4.0. Tried with index_by.

def next_question
  index = campaign.quiz_questions.index self
  campaign.quiz_questions[index + 1]
end

调试器

(byebug) campaign.quiz_questions.index
*** NoMethodError Exception: undefined method `index' for #<QuizQuestion::ActiveRecord_Associations_CollectionProxy:0x007f80012d71b0>
Did you mean?  index_by

使用index_by

Using index_by

(byebug) index = campaign.quiz_questions.index_by
#<Enumerator: #<ActiveRecord::Associations::CollectionProxy [#<QuizQuestion id: 113, campaign_id: 492, message: "Where did Hullabalooza's freak show manager send H...", created_at: "2016-07-20 20:50:32", updated_at: "2016-07-20 20:50:32">]>:index_by>

索引+ 1

(byebug) index + 1
*** NoMethodError Exception: undefined method `+' for #<Enumerator:0x007fc4db445960>

nil

推荐答案

进行了更改到 find_index 方法。现在可以正常使用了。

changed it to find_index method. Now it's working

def next_question
  index = campaign.quiz_questions.find_index self
  campaign.quiz_questions[index + 1]
end

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