Getting JSON back from rails with respond_with

Question

I have a jquery ajax call that goes to the create action, and I need to get the response back as JSON to then do something with it on the page in the success ajax function, but for some reason with rails it keeps throwing a missing template error:

class MembersController < ApplicationController
  respond_to :json

  def create
    @member = @group.members.build
    @member.user_id = params[:user_id]
    respond_with(@member) if @member.save
  end
end

Should I be rendering nothing at all?

Answer 1

I believe you should be using

respond_with(@member)

Removing the conditional.

This will use an "Unprocessable Entity" for json requests with an invalid object.