Question

我想让我的Test类的实例在初始化时通过连接类得到五个练习问题。如果测试是“考试”，那么它无需参加课程即可获得5个考试问题。（问题类型具有不同的模型）

到目前为止，它的行为不符合我的预期

self.practice_questions = []

它每次都会创建5个连接类，但是self.practice_questions数组保持为空。

def get_questions
  puts "ASDASDASDASDSAD"
  array = []
  if self.for_practice
    puts "ASDASDASOASKODKSAOKDASODKOASKDSAOKDOASKDOASK"

    PracticeQuestion.sort_for_selection[0...5].each do |question|
      array << question
      question.use_practice_question
    end
  elsif for_practice === false
    puts self.exam_questions
    if self.exam_questions.length ===0
     grab 5 unused exam type questions
     ExamQuestion.unused[0...5].each do |question|
     puts "grabbing question #{question.title}"
     question.test = self
     question.use_question
    end
  end
  puts "hello"
  puts self.practice_questions.length
  self.practice_questions ||= array
  self.save
  puts self.practice_questions.length

  self.practice_questions.each {|question| puts question.title}
end

Answer 1

self.practice_questions ||= array仅在self.practice_questions为false或nil时分配数组，您确定它是其中之一吗？

如果practice_questions是has_many，请尝试以下一项：

array.each do |el|
  self.practice_questions << el
end

或：

self.practice_questions_ids = array.map(&:id)

https://guides.rubyonrails.org/association_basics.html#has-many-association-reference

如何在Rails中创建类的实例，通过关系为每个新实例提供5个has_many

1 个答案: