Models and controllers looks more like Rails

app/controllers/static_pages_controller.rb

@@ -1,12 +1,11 @@
 class StaticPagesController < ApplicationController
   def roadmap
     @post_statuses = PostStatus
+      .find_roadmap
       .select(:id, :name, :color)
-      .where(show_in_roadmap: true)
-      .order(order: :asc)
 
     @posts = Post
+      .find_with_post_status_in(@post_statuses)
       .select(:id, :title, :board_id, :post_status_id, :user_id, :created_at)
-      .where(post_status_id: @post_statuses.pluck(:id))
   end
 end