move

lib/annotate/annotate_models.rb

 module AnnotateModels
-  class << self
   # Annotate Models plugin use this header
   COMPAT_PREFIX = "== Schema Info"
   PREFIX = "== Schema Information"
@@ -23,6 +22,7 @@ module AnnotateModels
   # Example: show "integer" instead of "integer(4)"
   NO_LIMIT_COL_TYPES = ["integer", "boolean"]
 
+  class << self
     def model_dir
       @model_dir || "app/models"
     end