add old flash to realtion create

yopa-web/src/routes/relation_model.rs

@@ -30,6 +30,19 @@ pub(crate) async fn create_form(
 
     debug!("ID = {}", object_id);
 
+    if let Ok(Some(form)) = session.take::<RelationModelCreateForm>("old") {
+        context.insert("old", &form);
+    } else {
+        context.insert("old", &RelationModelCreateForm {
+            object: Default::default(),
+            name: "".to_string(),
+            reciprocal_name: "".to_string(),
+            optional: false,
+            multiple: false,
+            related: Default::default()
+        });
+    }
+
     let object = rg.get_object_model(object_id.parse_or_bad_request()?)
         .ok_or_else(|| actix_web::error::ErrorNotFound("No such source object"))?;
 
@@ -40,10 +53,12 @@ pub(crate) async fn create_form(
     context.insert("models", &models);
     context.insert("object", &object);
 
+
+
     TERA.build_response("relation_create", &context)
 }
 
-#[derive(Deserialize)]
+#[derive(Serialize,Deserialize)]
 pub(crate) struct RelationModelCreateForm {
     pub object: ID,
     pub name: String,
@@ -80,6 +95,7 @@ pub(crate) async fn create(
         Err(e) => {
             warn!("Error creating relation model: {}", e);
             session.flash_error(e.to_string());
+            session.set("old", &form);
             redirect(format!("/model/relation/create/{}", form.object))
         }
     }