Make topics invisible when first post is automatically hidden because of spam flags

app/services/spam_rules_enforcer.rb

@@ -51,12 +51,16 @@ class SpamRulesEnforcer
   end
 
   def punish_user
+    Post.transaction do
       Post.update_all(["hidden = true, hidden_reason_id = COALESCE(hidden_reason_id, ?)", Post.hidden_reasons[:new_user_spam_threshold_reached]], user_id: @user.id)
+      topic_ids = Post.where('user_id = ? and post_number = ?', @user.id, 1).pluck(:topic_id)
+      Topic.update_all({ visible: false }, id: topic_ids) unless topic_ids.empty?
       SystemMessage.create(@user, :too_many_spam_flags)
       GroupMessage.create(Group[:moderators].name, :user_automatically_blocked, {user: @user, limit_once_per: false})
       @user.blocked = true
       @user.save
     end
+  end
 
   def clear_user
     SystemMessage.create(@user, :unblocked)

spec/services/spam_rules_enforcer_spec.rb

@@ -112,6 +112,11 @@ describe SpamRulesEnforcer do
       expect(post.reload).to be_hidden
     end
 
+    it "hides the topic if the post was the first post" do
+      subject.punish_user
+      expect(post.topic.reload).to_not be_visible
+    end
+
     it 'prevents the user from making new posts' do
       subject.punish_user
       expect(Guardian.new(user).can_create_post?(nil)).to be_false