Correctly serialize model values

django_forms_as_jsonschema/layout.py

@@ -38,7 +38,15 @@ class LayoutNode(ABC):
             if isinstance(field, LayoutNode):
                 model.update(field.build_model(form))
             else:
-                model[field] = str(form[field].value())  # FIXME: Correctly serialize
+                # Convert the value of the form to a JSON-representable type to put inside the html form
+                # This is done using the BoundField.value(), Field.prepare_value() and Widget.format_value()
+                # methods, as different django libraries do this formatting at different places.
+                field_class = form[field].field
+                model[field] = field_class.widget.format_value(
+                    field_class.prepare_value(
+                        form[field].value()
+                    )
+                )
 
         return model