Ruby on Rails

please help solve the problem.

There is a table users:
id :integer, autoincrement
name :string
gender_id :integer

There is a table genders:
id :integer, autoincrement
gender_name :string

model User:
class User < ActiveRecord::Base
  belongs_to  :gender
end

model Gender:
class Gender < ActiveRecord::Base
  has_many  :users
end

I need the gendername. I try to do so:
<% @users.each do |user| %>
    <div class="col-xs-6"><%= user.name %></div>
    <div class="col-xs-2"><%= user.gender_id %></div>
<% end %>

the result is output number, but I need to gendername




p.s.
so I tried:
<div class="col-xs-2"><%= user.gender.gender_name %></div>

in this case receives the following error message:
undefined method `gender_name' for nil:NilClass

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