Fix bug in boards load and destroy belonging posts when destroying board

app/controllers/application_controller.rb

@@ -10,6 +10,6 @@ class ApplicationController < ActionController::Base
     end
 
     def load_boards
-      @boards = Board.all.only(:id, :name)
+      @boards = Board.select(:id, :name).order(order: :asc)
     end
 end

app/models/board.rb

@@ -1,4 +1,6 @@
 class Board < ApplicationRecord
+  has_many :posts, dependent: :destroy
+  
   after_initialize :set_order_to_last
 
   validates :name, presence: true, uniqueness: true