keep track of post approvals to prevent approval cycles

db/migrate/20161101003139_create_post_approvals.rb

@@ -0,0 +1,12 @@
+class CreatePostApprovals < ActiveRecord::Migration
+  def change
+    create_table :post_approvals do |t|
+    	t.integer :user_id, null: false
+    	t.integer :post_id, null: false
+      t.timestamps null: false
+    end
+
+    add_index :post_approvals, :user_id
+    add_index :post_approvals, :post_id
+  end
+end