app/models/oauth2_token.rb in vidibus-oauth2_server-0.0.8 vs app/models/oauth2_token.rb in vidibus-oauth2_server-0.0.9

@@ -13,12 +13,12 @@
   field :code, :type => String
 
   field :code_expires_at, :type => Time
   field :token_expires_at, :type => Time
 
-  index :client_id
-  index :token
-  index :code
+  index({client_id: 1})
+  index({token: 1})
+  index({code: 1})
 
   validates :client_id, :redirect_url, :presence => true
   validates :token, :code, :uniqueness => {:allow_blank => true}
 
   before_create :generate_code