Add ORM dependencies and after_destroy counter updates

Author: indigodavid

app/models/comment.rb

@@ -3,6 +3,7 @@ class Comment < ApplicationRecord
   belongs_to :post
 
   after_save :update_comments_counter
+  after_destroy :update_comments_counter
 
   def update_comments_counter
     post.update(comments_counter: post.comments.count)

app/models/like.rb

@@ -3,6 +3,7 @@ class Like < ApplicationRecord
   belongs_to :post
 
   after_save :update_likes_counter
+  after_destroy :update_likes_counter
 
   validates :author, uniqueness: { scope: :post }
 

app/models/post.rb

@@ -1,9 +1,10 @@
 class Post < ApplicationRecord
   belongs_to :author, class_name: 'User', foreign_key: :author_id
-  has_many :likes
-  has_many :comments
+  has_many :likes, dependent: :destroy
+  has_many :comments, dependent: :destroy
 
   after_save :update_posts_counter
+  after_destroy :update_posts_counter
 
   validates :title, presence: true
   validates :title, length: { maximum: 250 }