Refactor code that raises deprecating warnings in Rails 4

app/models/topic.rb

@@ -89,9 +89,9 @@ class Topic < ActiveRecord::Base
 
   scope :listable_topics, lambda { where('topics.archetype <> ?', [Archetype.private_message]) }
 
-  scope :by_newest, order('topics.created_at desc, topics.id desc')
+  scope :by_newest, -> { order('topics.created_at desc, topics.id desc') }
 
-  scope :visible, where(visible: true)
+  scope :visible, -> { where(visible: true) }
 
   scope :created_since, lambda { |time_ago| where('created_at > ?', time_ago) }
 

app/models/topic_user.rb

@@ -3,7 +3,7 @@ class TopicUser < ActiveRecord::Base
   belongs_to :topic
 
   scope :starred_since, lambda { |sinceDaysAgo| where('starred_at > ?', sinceDaysAgo.days.ago) }
-  scope :by_date_starred, group('date(starred_at)').order('date(starred_at)')
+  scope :by_date_starred, -> { group('date(starred_at)').order('date(starred_at)') }
 
   scope :tracking, lambda { |topic_id|
     where(topic_id: topic_id)

app/services/user_blocker.rb

@@ -23,7 +23,7 @@ class UserBlocker
   def hide_posts
     Post.where(user_id: @user.id).update_all(["hidden = true, hidden_reason_id = COALESCE(hidden_reason_id, ?)", Post.hidden_reasons[:new_user_spam_threshold_reached]])
     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?
+    Topic.where(id: topic_ids).update_all({ visible: false }) unless topic_ids.empty?
   end
 
   def unblock