will_paginate only show previous_page & next_page?
<p>I don't want to list out the number of each page. How can we just show "previous" and "next" with <code>will_paginate</code>?</p>

<p><strong>view</strong></p>

<pre><code>&lt;%= will_paginate @activities %&gt;
&lt;% @activities.each do |activity| %&gt;
  etc...
&lt;% end %&gt;
</code></pre>

<p><strong>controller</strong></p>

<pre><code>class ActivitiesController &lt; ApplicationController
    def index
        @activities = Activity.order("created_at desc").where(user_id: current_user.following_ids).paginate(:page =&gt; params[:page])
    end
end
</code></pre>

<p><strong>model</strong></p>

<pre><code>class Activity &lt; ActiveRecord::Base
  self.per_page = 25

  def page_number
    (index / per_page.to_f).ceil
  end

  private

  def index
    Activity.order(created_at: :desc).index self
  end
end
</code></pre>