如何在Rails中包含多个订单

Question

我有两个模型：Question和Answer。问题-答案关系为1-n

我的问题和答案都具有order属性，现在我需要按顺序列出问题及其答案。

像：

Question.includes(:answers).order(questions: {order: :asc}, answers: {order: :asc})

我们非常感谢您的帮助！

Answer 1

您可以在模型中的has_many上指定订单。

# app/models/question.rb
# This will order answers by date, you presumably want something else
has_many :answers, -> { order(date: :desc) }

Answer 2

我提出了解决方案

@questions = Question
               .includes(:answers)
               .includes(:categories)
               .order('questions.order desc', 'answers.order desc').all

了解更多here