keep track of post approvals to prevent approval cycles

app/models/post_approval.rb

@@ -0,0 +1,12 @@
+class PostApproval < ActiveRecord::Base
+	belongs_to :user
+	belongs_to :post
+
+	def self.prune!
+		where("created_at < ?", 1.month.ago).delete_all
+	end
+
+	def self.approved?(user_id, post_id)
+		where(user_id: user_id, post_id: post_id).exists?
+	end
+end