install.rb in searchjoy-0.3.2

- old
+ new

@@ -1,20 +1,18 @@
 class <%= migration_class_name %> < ActiveRecord::Migration<%= migration_version %>
   def change
     create_table :searchjoy_searches do |t|
-      t.integer :user_id
+      t.references :user
       t.string :search_type
       t.string :query
       t.string :normalized_query
       t.integer :results_count
       t.timestamp :created_at
-      t.integer :convertable_id
-      t.string :convertable_type
+      t.references :convertable, polymorphic: true
       t.timestamp :converted_at
     end
 
     add_index :searchjoy_searches, [:created_at]
     add_index :searchjoy_searches, [:search_type, :created_at]
-    add_index :searchjoy_searches, [:search_type, :normalized_query, :created_at], name: "index_searchjoy_searches_on_search_type_normalized_query" # autogenerated name is too long
-    add_index :searchjoy_searches, [:convertable_id, :convertable_type]
+    add_index :searchjoy_searches, [:search_type, :normalized_query, :created_at], name: "index_searchjoy_searches_on_search_type_query" # autogenerated name is too long
   end
 end