- (IBAction)submitLogin:(id)sender {
    NSString *username = usernameField.text;
    NSString *password = passwordField.text;
    [[AFTestClient sharedClient] setAuthorizationHeaderWithUsername:username password:password];
    [[AFTestClient sharedClient] postPath:@"login/" parameters:nil success:^(AFHTTPRequestOperation *operation, id responseObject) {
     NSLog(@"Success");

} failure:^(AFHTTPRequestOperation *operation, NSError *error) {
    NSLog(@"Failure");
}];
}

class ActivitiesController < ApplicationController
before_filter :authenticate_user!, :only => [:login, :index]

def login
  @user = current_user
  respond_to do |format|
    format.html {render :text => "#{@user.id}"}
    format.xml {render :text => "#{@user.id}" }
  end
end

def index
    @user = current_user
    respond_to do |format|
    format.html {render :text => "Current user is logged in."}
    format.xml {render :text => "#{@user.id}" }
    format.json
  end
end
end