如何在json结果中包含用户对象？

Question

@song.likes.select('likes.*, users.*').includes(:user).to_json 

Only converts the like objects. Is there a way to include the user objects in the json result? Via Ruby or other.

Answer 1

@song.likes.select('likes.*, users.*').includes(:user).to_json(:include => :user)

Would do what you want.

In Rails-JSON you have to explicitly specify which associations get traversed to prevent too deep object trees and circular references.