Rails 4 - undefined method - Probably an easy answer

I think this is probably an easy fix, I'm just not sure what to do.

I have the following:

User model

class User < ActiveRecord::Base has_many :events def full_name [first_name, last_name].join(" ") end end 

Event model

class Event < ActiveRecord::Base belongs_to :user def as_json(options = {}) { :id => self.id, :title => self.name, :location => self.location, :start => start_time.rfc822, :end => end_time.rfc822, :event_creator => user.full_name #this is what is causing the problem } end end 

I get the following error when I run the query:

NoMethodError in CalendarController#index undefined method `full_name' for nil:NilClass 

But, when I am in Rails Console, if I run the method:

irb>> Event.find(1).as_json irb>> => {:id=>1, :title=>"Your title", :location=>"Bermuda", :start=>"Sun, 05 Jan 2014 02:50:07 +0000", :end=>"Sun, 05 Jan 2014 02:51:46 +0000", :event_creator=>"John Smith"} 

As you can see, the "event_creator" works with no problem in the Rails console.

Any ideas on what is going on here and what I need to change?

Thanks very much!