huginn/app/models/scenario.rb

class Scenario < ActiveRecord::Base
  include HasGuid

  attr_accessible :name, :agent_ids, :description, :public, :source_url, :tag_fg_color, :tag_bg_color

  belongs_to :user, :counter_cache => :scenario_count, :inverse_of => :scenarios
  has_many :scenario_memberships, :dependent => :destroy, :inverse_of => :scenario
  has_many :agents, :through => :scenario_memberships, :inverse_of => :scenarios

  validates_presence_of :name, :user

  validates_format_of :tag_fg_color, :tag_bg_color,
    # Regex adapted from: http://stackoverflow.com/a/1636354/3130625
    :with => /\A#(?:[0-9a-fA-F]{3}){1,2}\z/, :allow_nil => true,
    :message => "must be a valid hex color."

  validate :agents_are_owned

  protected

  def agents_are_owned
    errors.add(:agents, "must be owned by you") unless agents.all? {|s| s.user == user }
  end
end