belongs_to 和 has_one 有什么区别? [英] What's the difference between belongs_to and has_one?

问题描述

What is the difference between a belongs_to and a has_one?

Reading the Ruby on Rails guide hasn't helped me.

解决方案

They essentially do the same thing, the only difference is what side of the relationship you are on. If a User has a Profile, then in the User class you'd have has_one :profile and in the Profile class you'd have belongs_to :user. To determine who "has" the other object, look at where the foreign key is. We can say that a User "has" a Profile because the profiles table has a user_id column. If there was a column called profile_id on the users table, however, we would say that a Profile has a User, and the belongs_to/has_one locations would be swapped.

here is a more detailed explanation.

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