ActiveRecord includes to_json doesn't include relations

I have a model find like this for an API:

Article.includes(:comments).all

When applying the to_json method, I'd like to get back the article along with an array of the comments. Unfortunately, the to_json method only开发者_运维知识库 returns the Article model. Help.

use this :

Article.includes(:comments).find(your_article_id).to_json(:include => :comments)

using all on the model will fetch every single article available in the database. using to_json on a relation should get you a json array of all records returned by the relation as json.

you can get additional info here.