Question

if I’ve two models.

Modela :has_many :modelbs

Modelb :belongs_to :modala

How can I use inner join to retrieve the data from the database, store them inside an array an return it back to the caller as a JSON string?

I understand there are find and related methods, but these methods seemed to be returning me array containing only objects of the class I did a find on (eg. Modela.find), and I will have to iterate through that array and and pull out Modelbs that belongs to Modela. Is there a easier way of doing it?

Answer 1

User has_many :posts

Post belongs_to :user

@user = User.find(params[:user_id])
@posts = @user.posts.to_json

update Multiple users and their posts to json:

@users = User.all
@posts = @users.to_json(:include => :posts)