#16 Add last sharer and sharers count to show

app/serializers/each_post_serializer.rb

@@ -1,7 +1,7 @@
 class EachPostSerializer < ActiveModel::Serializer
 
   attributes :id, :viewed_times, :url, :title, :type, :processed, :good_format, :created_at, :likes_count, :comments_count,
-             :summary, :thumbnail, :first_sharer
+             :summary, :thumbnail, :first_sharer, :last_sharer, :sharers_count
 
   def thumbnail
     object.thumbnail.try(:file).try(:url)
@@ -9,6 +9,22 @@ class EachPostSerializer < ActiveModel::Serializer
 
   def first_sharer
     user = ShareInstance.where(sharable_id: object.id).first.user
+    user_info_json(user)
+  end
+
+  def last_sharer
+    return nil if ShareInstance.where(sharable_id: object.id).count == 1
+    user = ShareInstance.where(sharable_id: object.id).last.user
+    user_info_json(user)
+  end
+
+  def sharers_count
+    ShareInstance.where(sharable_id: object.id).count
+  end
+
+  private
+
+  def user_info_json(user)
     {
       id: user.try(:id),
       name: user.try(:name),