Add announcements to the top of the application template

app/controllers/application_controller.rb

@@ -6,6 +6,7 @@ class ApplicationController < ActionController::Base
   before_action :configure_permitted_parameters, if: :devise_controller?
   before_action :check_locale
   before_action :banned?
+  before_action :find_active_announcements
 
   # check if user wants to read
   def check_locale
@@ -50,6 +51,10 @@ class ApplicationController < ActionController::Base
     end
   end
 
+  def find_active_announcements
+    @active_announcements ||= Announcement.find_active
+  end
+
   include ApplicationHelper
 
   protected

app/models/announcement.rb

@@ -6,6 +6,16 @@ class Announcement < ApplicationRecord
   validates :link_href, presence: true, if: -> { link_text.present? }
   validate :starts_at, :validate_date_range
 
+  def self.find_active
+    Rails.cache.fetch "announcement_active", expires_in: 1.minute do
+      where "starts_at <= :now AND ends_at > :now", now: Time.current
+    end
+  end
+
+  def active?
+    Time.now.utc >= starts_at && Time.now.utc < ends_at
+  end
+
   def link_present?
     link_text.present?
   end

app/views/layouts/application.html.haml

@@ -25,6 +25,7 @@
     = csrf_meta_tags
   %body#version1
     = render 'layouts/header'
+    = render 'shared/announcements'
     = yield
     = render 'shared/locales'
     - if Rails.env.development?

app/views/shared/_announcements.haml

@@ -0,0 +1,6 @@
+.container.announcements
+  - @active_announcements.each do |announcement|
+    .alert.alert-announcement
+      %p= announcement.content
+      - if announcement.link_present?
+        %a.alert-link{ href: announcement.link_href }= announcement.link_text