backlog_widget.rb

class BacklogWidget < Apotomo::Widget
  PivotalTracker::Client.token = APP_CONFIG["pivotal"]["api_key"]

  def display
    project_config = APP_CONFIG["pivotal"]["projects"]["firefly"]
    project = PivotalTracker::Project.find(project_config["id"])
    iteration = PivotalTracker::Iteration.current(project)

    @filter_labels = get_labels(params[:labels])
    @stories = get_stories(iteration, @filter_labels)

    render
  end

  private

  def get_labels(label_param)
    label_param.split(",").map(&:strip) if label_param.present?
  end

  def get_stories(iteration, filter_labels)
    return iteration.stories unless filter_labels

    return iteration.stories.select do |story|
      story_labels = story.labels.split(",")
      (story_labels & filter_labels).sort == filter_labels.uniq.sort
    end
  end
end

gistfile1.rb

# Given a URL like: 
#
#   /backlog?labels=cart,shopping
# 
# return stories that have at least "cart" and "shopping as labels.

if params[:labels].present?
  @labels = params[:labels].split(",").map { |label| label.strip }
  @stories = iteration.stories.select do |story|
    labels = story.labels.split(",")
    (labels & @labels).sort == @labels.uniq.sort
  end
else
  @stories = iteration.stories
end