class Answer < ActiveRecord::Base
    has_many :comments, dependent: :destroy
    belongs_to :question
    attr_accessible :anonymous, :answer, :commenter, :votes, :comments_attributes
    accepts_nested_attributes_for :comments
end

<%= form_for([@question, @answer]) do |f| %>
        <p>
            <%= f.label :answer %>
            <%= f.text_area :answer, :cols => "50", :rows => "30"%>
        </p>
        <p>
            <%= check_box_tag(:anonymous)%>
            <%= label_tag(:anonymous, "Anonymous")%>
        </p>
        <p>
            <%= f.submit "Submit Answer" %>
        </p>
  <% end %>

def create
        @answer = @question.answers.new(params[:answer])
        if @answer.anonymous == true
            @answer.commenter = "Anonymous"
        else
            @answer.commenter = current_user.username
        end
        if @answer.save
            redirect_to question_path(@question)
        else
            redirect_to questions_path
        end
end

f.check_box :anonymous

<%= check_box_tag(:anonymous)%>