Automatically use cached form data

atst/forms/forms.py

@@ -1,7 +1,8 @@
 from flask_wtf import FlaskForm
+from flask import current_app, request as http_request
 
 
-class ValidatedForm(FlaskForm):
+class _ValidatedForm(FlaskForm):
     def perform_extra_validation(self, *args, **kwargs):
         """Performs any applicable extra validation. Must
         return True if the form is valid or False otherwise."""
@@ -12,3 +13,11 @@ class ValidatedForm(FlaskForm):
         _data = super().data
         _data.pop("csrf_token", None)
         return _data
+
+
+class ValidatedForm(_ValidatedForm):
+    def __init__(self, formdata=None, **kwargs):
+        formdata = formdata or {}
+        cached_data = current_app.form_cache.from_request(http_request)
+        cached_data.update(formdata)
+        super().__init__(cached_data, **kwargs)