FIX: make TopicEmbed trashable

app/models/topic.rb

@@ -40,12 +40,16 @@ class Topic < ActiveRecord::Base
     update_category_topic_count_by(-1) if deleted_at.nil?
     super(trashed_by)
     update_flagged_posts_count
+    self.topic_embed.trash! if has_topic_embed?
   end
 
   def recover!
     update_category_topic_count_by(1) unless deleted_at.nil?
     super
     update_flagged_posts_count
+    unless (topic_embed = TopicEmbed.with_deleted.find_by_topic_id(id)).nil?
+      topic_embed.recover!
+    end
   end
 
   rate_limit :default_rate_limiter
@@ -121,6 +125,8 @@ class Topic < ActiveRecord::Base
   has_one :user_warning
   has_one :first_post, -> {where post_number: 1}, class_name: Post
 
+  has_one :topic_embed, dependent: :destroy
+
   # When we want to temporarily attach some data to a forum topic (usually before serialization)
   attr_accessor :user_data
 

app/models/topic_embed.rb

@@ -1,11 +1,19 @@
 require_dependency 'nokogiri'
 
 class TopicEmbed < ActiveRecord::Base
+  include Trashable
+
   belongs_to :topic
   belongs_to :post
   validates_presence_of :embed_url
   validates_uniqueness_of :embed_url
 
+  before_validation(on: :create) do
+    unless (topic_embed = TopicEmbed.with_deleted.where('deleted_at IS NOT NULL AND embed_url = ?', embed_url).first).nil?
+      topic_embed.destroy!
+    end
+  end
+
   class FetchResponse
     attr_accessor :title, :body, :author
   end
@@ -203,13 +211,15 @@ end
 #
 # Table name: topic_embeds
 #
-#  id           :integer          not null, primary key
-#  topic_id     :integer          not null
-#  post_id      :integer          not null
-#  embed_url    :string(1000)     not null
-#  content_sha1 :string(40)
-#  created_at   :datetime         not null
-#  updated_at   :datetime         not null
+#  id            :integer          not null, primary key
+#  topic_id      :integer          not null
+#  post_id       :integer          not null
+#  embed_url     :string(1000)     not null
+#  content_sha1  :string(40)
+#  created_at    :datetime         not null
+#  updated_at    :datetime         not null
+#  deleted_at    :datetime
+#  deleted_by_id :integer
 #
 # Indexes
 #

db/migrate/20170425083011_add_deleted_at_to_topic_embeds.rb

@@ -0,0 +1,6 @@
+class AddDeletedAtToTopicEmbeds < ActiveRecord::Migration
+  def change
+    add_column :topic_embeds, :deleted_at, :datetime
+    add_column :topic_embeds, :deleted_by_id, :integer, null: true
+  end
+end

spec/models/topic_spec.rb

@@ -1493,6 +1493,15 @@ describe Topic do
         expect { topic.trash!(moderator) }.to_not change { category.reload.topic_count }
       end
     end
+
+    it "trashes topic embed record" do
+      topic = Fabricate(:topic)
+      post = Fabricate(:post, topic: topic, post_number: 1)
+      topic_embed = TopicEmbed.create!(topic_id: topic.id, embed_url: "https://blog.codinghorror.com/password-rules-are-bullshit", post_id: post.id)
+      topic.trash!
+      topic_embed.reload
+      expect(topic_embed.deleted_at).not_to eq(nil)
+    end
   end
 
   describe 'recover!' do
@@ -1509,6 +1518,15 @@ describe Topic do
         expect { topic.recover! }.to_not change { category.reload.topic_count }
       end
     end
+
+    it "recovers topic embed record" do
+      topic = Fabricate(:topic, deleted_at: 1.day.ago)
+      post = Fabricate(:post, topic: topic, post_number: 1)
+      topic_embed = TopicEmbed.create!(topic_id: topic.id, embed_url: "https://blog.codinghorror.com/password-rules-are-bullshit", post_id: post.id, deleted_at: 1.day.ago)
+      topic.recover!
+      topic_embed.reload
+      expect(topic_embed.deleted_at).to eq(nil)
+    end
   end
 
   context "new user limits" do