Add 'newstyle' behavior for Form.validate()

tailbone/forms2/core.py

@@ -789,13 +789,28 @@ class Form(object):
                 return getattr(record, field_name, None)
 
     def validate(self, *args, **kwargs):
-        raise_error = kwargs.pop('raise_error', True)
-        form = self.make_deform_form()
-        try:
-            return form.validate(*args, **kwargs)
-        except deform.ValidationFailure:
-            if raise_error:
-                raise
+        if kwargs.pop('newstyle', False):
+            # yay, new behavior!
+            if hasattr(self, 'validated'):
+                del self.validated
+            if self.request.method != 'POST':
+                return False
+            controls = self.request.POST.items()
+            dform = self.make_deform_form()
+            try:
+                self.validated = dform.validate(controls)
+                return True
+            except deform.ValidationFailure:
+                return False
+
+        else: # legacy behavior
+            raise_error = kwargs.pop('raise_error', True)
+            form = self.make_deform_form()
+            try:
+                return form.validate(*args, **kwargs)
+            except deform.ValidationFailure:
+                if raise_error:
+                    raise
 
 
 class FieldList(list):