gistfile1.rb

class TagsController < ApplicationController
  def index
    @tags = Post.published_posts.tag_counts.where("name like ?", "%#{params[:q]}%").order(:name)

    @json = []

    @tags.each do |tag|
      @json << {:tag => tag.name, :freq => tag.count}
    end

    respond_to do |format|
      format.html
      format.json { render :json => @json }
    end
  end

end

## OUTPUT

[{"tag":"10","freq":1},{"tag":"Coderay","freq":1},{"tag":"Family","freq":1},{"tag":"Gem","freq":1},{"tag":"Linux","freq":1},{"tag":"Mac","freq":1},{"tag":"Personal","freq":2},{"tag":"Rails","freq":3},{"tag":"Ruby","freq":2},{"tag":"Sample","freq":1},{"tag":"Test","freq":3},{"tag":"Text","freq":1},{"tag":"Windows","freq":1}]