#411

backend/app/models/post.rb

@@ -56,6 +56,9 @@ class Post < ApplicationRecord
 
   has_many :post_tags, dependent: :destroy, inverse_of: :post
   has_many :tags, through: :post_tags
+  has_many :active_tags, -> { where(tags: { discarded_at: nil }) },
+           through: :post_tags,
+           source: :tag
 
   has_many :user_post_views, dependent: :delete_all
   has_many :post_similarities, dependent: :delete_all