我应该在轨道上的ruby中使用has_one或belongs_to吗？

Question

I want to have a Status model which will be relatively static after some user-defined set up (and different users may have different values on status).

The status can apply to different models, such as Contact and Event .

so the statuses returned by contact.status will be different from event.status

I want to design the app so that status table has different types ( contacts and events ).

What is the right strategy and format for this?

I am thinking of declaring :has_one Status in the Contact model, and storing a :status_id in the :contacts table. Ditto with Event .

:statuses table will have the status value, type, and date.

does this make sense? Can you suggest a better approach?

Answer 1

There is a guide on this very question. Your situation is slightly different in that it seems as though your Status model really needs to be polymorphic since different things will be 'statusable'.

To answer your question, Contact/Event has_one Status does make sense to me.

Answer 2

只是为了在更一般的设置中完成答案，可以推动您的选择： belongs_to关联在具有外键的模型中使用。

Answer 3

Firstly, the has_one relationship does not store an id in the current model. It looks for a foreign key in the relative table. In order to store a status_id in Contacts or Events you'd use belongs_to.

Secondly, depending on the type of information you're storing in Status, why does it need to be its own separate table? Why not make a status column in each model you want to use status on? A little more information may be useful here.