Add emoji icon support on notification (expects custom)

app/serializers/rest/emoji_reaction_serializer.rb

@@ -1,15 +1,20 @@
 # frozen_string_literal: true
 
 class REST::EmojiReactionSerializer < ActiveModel::Serializer
-  attributes :name, :count
+  attributes :name
 
+  attribute :count, if: :count?
   attribute :url, if: :custom_emoji?
   attribute :static_url, if: :custom_emoji?
   attribute :domain, if: :custom_emoji?
   attribute :account_ids, if: :account_ids?
 
+  def count?
+    object.respond_to?(:count)
+  end
+
   def custom_emoji?
-    object.url.present?
+    object.respond_to?(:url)
   end
 
   def account_ids?

app/serializers/rest/notification_serializer.rb

@@ -6,6 +6,7 @@ class REST::NotificationSerializer < ActiveModel::Serializer
   belongs_to :from_account, key: :account, serializer: REST::AccountSerializer
   belongs_to :target_status, key: :status, if: :status_type?, serializer: REST::StatusSerializer
   belongs_to :report, if: :report_type?, serializer: REST::ReportSerializer
+  belongs_to :emoji_reaction, if: :emoji_reaction_type?, serializer: REST::EmojiReactionSerializer
 
   def id
     object.id.to_s
@@ -18,4 +19,8 @@ class REST::NotificationSerializer < ActiveModel::Serializer
   def report_type?
     object.type == :'admin.report'
   end
+
+  def emoji_reaction_type?
+    object.type == :emoji_reaction
+  end
 end