Rails: include related object in JSON output
I'm not sure the new respond_to/respond_with style is flexible enough to do this. It very well may be, but as far as I understand, it's meant to simplify only the simplest cases.
You can achieve what you are trying to do with the old-style respond_to with a block, however, by passing parameters to to_json. Try something like this:
class NotesController < ApplicationController def index @notes = Note.order("created_at desc") respond_to do |format| format.json do render :json => @notes.to_json(:include => { :user => { :only => :username } }) end end endend
You can also use Jbuilder(https://github.com/rails/jbuilder) to response with data very flexible.
@notes = Note.includes(:user).order("created_at DESC")and in your index.json.jbuilder file, you can
json.extract! @notejson.username @note.user.username
Would it be possible to do it the other way around?
def index @user = User.includes(:notes).order("created_at DESC") respond_with @userendIt would be expensive to include user objects each time the @notes is iterated.