Forgot to use _to_hash for non-array value

Author: xhh

modules/swagger-codegen/src/main/resources/ruby/base_object.mustache

@@ -66,7 +66,7 @@ module {{moduleName}}
         if value.is_a?(Array)
           hash[param] = value.compact.map{ |v| _to_hash(v) }
         else
-          hash[param] = value
+          hash[param] = _to_hash(value)
         end
       end
       hash

samples/client/petstore/ruby/lib/petstore/models/base_object.rb

@@ -66,7 +66,7 @@ def to_hash
         if value.is_a?(Array)
           hash[param] = value.compact.map{ |v| _to_hash(v) }
         else
-          hash[param] = value
+          hash[param] = _to_hash(value)
         end
       end
       hash