Rails / ActiveRecord 中的多态模型
我对 ActiveRecord 有点生疏，所以如果答案很明显，请原谅我。
我的 Rails 项目中有三个模型对象：Student、Assignment 和 Course。正如您可能想象的那样，课程有has_many作业。现在我希望能够为学生分配任意数量的课程和个人作业。
我尝试使用基于“可分配”概念的多态关联，但无法使其正常工作。
在 Rails 中建模这些关系的最自然的方法是什么？
I'm a little rusty on my ActiveRecord, so forgive me if the answer is somehow obvious.
I have three model objects in a rails project: Student, Assignment, and Course. As you might imagine, a Course has_many assignments. Now I want to be able to assign to a Student an arbitrary number of Courses and individual Assignments.
I've tried to use a polymorphic association based on the notion of 'assignable', but can't get it to work properly.
What's the most natural way to model these relationships in rails?
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一种方法是简单地说学生
has_many作业和has_many课程。课程还有has_many作业。当然，我不知道您想在应用程序中实现什么目标，但课程和作业似乎是完全不同的实体，所以我不确定您为什么想要多态关联。One way to do it is to simply say that a Student
has_manyassignments andhas_manycourses. A Course alsohas_manyassignments. Of course I don't know what you're trying to achieve in your application, but it seems that courses and assignments are completely different entities, so I'm not sure why you'd like a polymorphic association.