agenda-libre-ruby/app/controllers/tags_controller.rb

# Manage event tags
class TagsController < InheritedResources::Base
  def index
    @tags = Event
      .pluck(:tags)
      .join(' ').split.group_by { |i| i }
      .reject { |_k, v| v.size < 2 }
      .map { |k, v| [k, v.size] }
      .sort

    respond_to do |format|
      format.html
      format.json { render json: @tags.to_json }
    end
  end

  def show
    @events_future = Event.future.tag params[:id]
    @events_past = Event.past.tag params[:id]
  end
end