gistfile1.rb

#Controller:
format.json { 
  render :json => {:ticket => @ticket.to_ember}.to_json
}

#Model:
# Ticket
def to_ember
  {
    :id => id,
    :valid => valid?
    :courses_users => self.courses_users.map(&:to_ember}
  }
end

def self.valid?
   self.validFrom < Time.now && self.validTo < Time.now
end

# CoursesUser
def to_ember
  {
    :id => id,
    :user => self.user.to_ember
  }
end

# User
def to_ember
  {
    :id => id,
    :first_name => first_name,
    :last_name => last_name
  }
end