Perform the where(...).first to find_by(...) refactoring.

This refactoring was automated using the command: bundle exec "ruby refactorings/where_dot_first_to_find_by/app.rb"

app/services/post_alerter.rb

@@ -137,7 +137,7 @@ class PostAlerter
   # Returns a list of users who were quoted in the post
   def extract_quoted_users(post)
     post.raw.scan(/\[quote=\"([^,]+),.+\"\]/).uniq.map do |m|
-      User.where("username_lower = :username and id != :id", username: m.first.strip.downcase, id: post.user_id).first
+      User.find_by("username_lower = :username and id != :id", username: m.first.strip.downcase, id: post.user_id)
     end.compact
   end
 

app/services/user_destroyer.rb

@@ -53,7 +53,7 @@ class UserDestroyer
           categories.each do |c|
             c.user_id = Discourse.system_user.id
             c.save!
-            if topic = Topic.with_deleted.where(id: c.topic_id).first
+            if topic = Topic.with_deleted.find_by(id: c.topic_id)
               topic.try(:recover!)
               topic.user_id = Discourse.system_user.id
               topic.save!