Question

I’m working on ruby on rails and i’m an absolute beginner.
My question is:
I have a user signup form and I would like to verify whether the username already exists and return the status in json format. I would like to achieve this by using the jquery ajax, how do i do this.

def check_user
 @user=User.find_by_username(params[:username'])
 respond_to do |format|
   format.html
   format.json { render json: !@user }
  end
end

my application.js:

$("#user_name").change(function(){
  //How do i call my check_user action and get a response
});

Answer 1

Take a look at validates_uniqueness_of in the API documentation