diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index 838a5a45..e09a8184 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -6,7 +6,7 @@ class PostsController < ApplicationController
       .left_outer_joins(:post_status)
       .select('posts.title, posts.description, post_statuses.name as post_status_name, post_statuses.color as post_status_color')
       .where(filter_params)
-      .search(params[:search])
+      .search_by_name_or_description(params[:search])
       .page(params[:page])
     
     render json: posts
@@ -30,9 +30,8 @@ class PostsController < ApplicationController
       defaults = { board_id: Board.first.id }
 
       params
-        .permit(:board_id, :post_status_id, :page, :search)
+        .permit(:board_id, :post_status_id)
         .with_defaults(defaults)
-        .except(:page, :search) # permit, but do not return page and search params
     end
     
     def post_params
diff --git a/app/controllers/static_pages_controller.rb b/app/controllers/static_pages_controller.rb
index f01654a0..4f02ca0c 100644
--- a/app/controllers/static_pages_controller.rb
+++ b/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
\ No newline at end of file
diff --git a/app/models/post.rb b/app/models/post.rb
index d41e022f..d1568c34 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -7,9 +7,15 @@ class Post < ApplicationRecord
 
   paginates_per 15
 
-  def self.search(s = '')
-    s = s || ''
-    s = sanitize_sql_like(s)
-    where("posts.title ILIKE ? OR posts.description ILIKE ?", "%#{s}%", "%#{s}%")
+  class << self
+    def find_with_post_status_in(post_statuses)
+      where(post_status_id: post_statuses.pluck(:id))
+    end
+
+    def search_by_name_or_description(s)
+      s = s || ''
+      s = sanitize_sql_like(s)
+      where("posts.title ILIKE ? OR posts.description ILIKE ?", "%#{s}%", "%#{s}%")
+    end
   end
 end
diff --git a/app/models/post_status.rb b/app/models/post_status.rb
index d73df254..658330e7 100644
--- a/app/models/post_status.rb
+++ b/app/models/post_status.rb
@@ -2,4 +2,11 @@ class PostStatus < ApplicationRecord
   validates :name, presence: true, uniqueness: true
   validates :color, format: { with: /\A#(?:[0-9a-fA-F]{3}){1,2}\z/ }
   validates :order, numericality: { only_integer: true, greater_than: 0 }
+
+  class << self
+    def find_roadmap
+      where(show_in_roadmap: true)
+      .order(order: :asc)
+    end
+  end
 end