Implement Event Ratings

db/migrate/20160922205550_create_rating_caches.rb

@@ -0,0 +1,17 @@
+class CreateRatingCaches < ActiveRecord::Migration
+  def self.up
+    create_table :rating_caches do |t|
+      t.belongs_to :cacheable, polymorphic: true
+      t.float :avg, null: false
+      t.integer :qty, null: false
+      t.string :dimension
+      t.timestamps
+    end
+
+    add_index :rating_caches, [:cacheable_id, :cacheable_type]
+  end
+
+  def self.down
+    drop_table :rating_caches
+  end
+end