feat: 別名を検索に展開（#20） (#243)

#20

#20 テスト・ケースのみ追記

#20

Co-authored-by: miteruzo <miteruzo@naver.com>
Reviewed-on: #243

backend/app/models/post.rb

@@ -8,8 +8,10 @@ class Post < ApplicationRecord
   has_many :active_post_tags, -> { kept }, class_name: 'PostTag', inverse_of: :post
   has_many :post_tags_with_discarded, -> { with_discarded }, class_name: 'PostTag'
   has_many :tags, through: :active_post_tags
-  has_many :user_post_views, dependent: :destroy
-  has_many :post_similarities
+
+  has_many :user_post_views, dependent: :delete_all
+  has_many :post_similarities, dependent: :delete_all
+
   has_one_attached :thumbnail
 
   before_validation :normalise_url