class BroadcastMessage < ActiveRecord::Base include CacheMarkdownField include Sortable cache_markdown_field :message, pipeline: :broadcast_message validates :message, presence: true validates :starts_at, presence: true validates :ends_at, presence: true validates :color, allow_blank: true, color: true validates :font, allow_blank: true, color: true default_value_for :color, '#E75E40' default_value_for :font, '#FFFFFF' CACHE_KEY = 'broadcast_message_current'.freeze after_commit :flush_redis_cache def self.current messages = Rails.cache.fetch(CACHE_KEY) { current_and_future_messages.to_a } return messages if messages.empty? now_or_future = messages.select(&:now_or_future?) # If there are cached entries but none are to be displayed we'll purge the # cache so we don't keep running this code all the time. Rails.cache.delete(CACHE_KEY) if now_or_future.empty? now_or_future.select(&:now?) end def self.current_and_future_messages where('ends_at > :now', now: Time.zone.now).reorder(id: :asc) end def active? started? && !ended? end def started? Time.zone.now >= starts_at end def ended? ends_at < Time.zone.now end def now? (starts_at..ends_at).cover?(Time.zone.now) end def future? starts_at > Time.zone.now end def now_or_future? now? || future? end def flush_redis_cache Rails.cache.delete(CACHE_KEY) end end