Add some comments to orm.py

Author: insspb

flask_mongoengine/wtf/orm.py

@@ -56,7 +56,9 @@ def convert(self, model, field, field_args):
             kwargs.update(field_args)
 
         if kwargs["validators"]:
-            # Create a copy of the list since we will be modifying it.
+            # Create a copy of the list since we will be modifying it, and if
+            # validators set as shared list between fields - duplicates/conflicts may
+            # be created.
             kwargs["validators"] = list(kwargs["validators"])
 
         if field.required:
@@ -79,8 +81,6 @@ def convert(self, model, field, field_args):
                 return f.RadioField(**kwargs)
             return f.SelectField(**kwargs)
 
-        ftype = type(field).__name__
-
         if hasattr(field, "to_form_field"):
             return field.to_form_field(model, kwargs)