英文:
How can I reference another model in a column of my Question model in Rails 7?
问题
在 Rails 7 中，我有一个名为 Question 的模型。这些问题可以使用下拉菜单或单选按钮进行回答。下拉菜单的信息来自其他模型。我有其他模型，比如 Place、Unit 等。我需要在 Question 中有一列，可以以某种方式保存这些模型的引用，或者像 question_col_model = Place.all 这样。我正在尝试弄清楚如何实现，但失败了。
起初，我考虑将它们保存在数组中，因为 PostgreSQL 支持数组。但它们就像该实例的快照，我需要实时更新。当模型更新时，下拉菜单会自动更新。
在使用 @questions 进行循环时，我需要为不同的问题获取不同的模型。
英文:
In rails 7, I have a model called Question. the questions are answered using dropdowns or radio buttons. The dropdown infos come from another models. I have another models like Place, Unit etc. I need a column in the Question where I can somehow save these models referance or maybe like question_col_model = Place.all. I am trying to figure out how to do but failed.
I can not use anything but models for the dropdowns. Thank you
At first I thought of keeping them in array as postgresql supports them. But they are like snapshots of that instance, I need realtime updates. When the model updates, the dropdown updates automaticaly.
When using @questions to loop, I need to get different models for different questions.
答案1
得分: 1
你可以这样设置你的关系：
class Question < ApplicationRecord
has_many :answers
end
class Answer < ApplicationRecord
belongs_to :question # 所以它有一个名为 "question_id" 的字段
end
你会有多个具有相同 "question_id" 值的答案。
英文:
You set up your relationships like this:
class Question < ApplicationRecord
has_many :answers
end
class Answer < ApplicationRecord
belongs_to :question # so it has a field called "question_id"
end
you will have several answers with the same question_id value
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