memberships.rb.tt in field_test-0.3.0

- old
+ new

@@ -1,15 +1,16 @@
 class <%= migration_class_name %> < ActiveRecord::Migration<%= migration_version %>
   def change
     create_table :field_test_memberships do |t|
-      t.string :participant
+      t.string :participant_type
+      t.string :participant_id
       t.string :experiment
       t.string :variant
       t.timestamp :created_at
       t.boolean :converted, default: false
     end
 
-    add_index :field_test_memberships, [:experiment, :participant], unique: true
-    add_index :field_test_memberships, :participant
+    add_index :field_test_memberships, [:participant_type, :participant_id, :experiment],
+      unique: true, name: "index_field_test_memberships_on_participant"
     add_index :field_test_memberships, [:experiment, :created_at]
   end
 end