gitlabhq/app/controllers/tags_controller.rb

class TagsController < ApplicationController
  def index
    @tags = Project.tag_counts.order('count DESC')
    @tags = @tags.where('name like ?', "%#{params[:term]}%") unless params[:term].blank?

    respond_to do |format|
      format.html
      format.json { render json: @tags.limit(8).map {|t| t.name}}
    end
  end
end