Log all changes of user trust level by an admin

lib/admin_logger.rb

@@ -13,4 +13,14 @@ class AdminLogger
       details: [:id, :username, :name, :created_at, :trust_level, :last_seen_at, :last_emailed_at].map { |x| "#{x}: #{deleted_user.send(x)}" }.join(', ')
     )
   end
-end
+
+  def log_trust_level_change(user, new_trust_level)
+    raise Discourse::InvalidParameters.new('user is nil') unless user and user.is_a?(User)
+    raise Discourse::InvalidParameters.new('new trust level is invalid') unless TrustLevel.levels.values.include? new_trust_level
+    AdminLog.create!(
+      action: AdminLog.actions[:change_trust_level],
+      admin_id: @admin.id,
+      details: [:id, :username, :name, :created_at, :trust_level, :last_seen_at, :last_emailed_at].map { |x| "#{x}: #{user.send(x)}" }.join(', ') + "new trust level: #{new_trust_level}"
+    )
+  end
+end

lib/boost_trust_level.rb

@@ -2,14 +2,16 @@ require_dependency 'promotion'
 
 class BoostTrustLevel
 
-  def initialize(user, level)
-    @user = user
-    @level = level.to_i
+  def initialize(args)
+    @user = args[:user]
+    @level = args[:level].to_i
     @promotion = Promotion.new(@user)
     @trust_levels = TrustLevel.levels
+    @logger = args[:logger]
   end
 
   def save!
+    @logger.log_trust_level_change(@user, @level)
     if @level < @user.trust_level
       demote!
     else