From 9ee8cb867caa3555ba48e53817d9e5ffab2d22c4 Mon Sep 17 00:00:00 2001
From: Artus <artus@landoftheunicorn.ovh>
Date: Sun, 27 Oct 2019 16:20:11 +0100
Subject: [PATCH] blanket impl of Update.undo()

---
 lootalot_db/src/lib.rs | 16 +++++++++++++++-
 1 file changed, 15 insertions(+), 1 deletion(-)

diff --git a/lootalot_db/src/lib.rs b/lootalot_db/src/lib.rs
index 07e835d..a24dbdc 100644
--- a/lootalot_db/src/lib.rs
+++ b/lootalot_db/src/lib.rs
@@ -42,7 +42,7 @@ pub fn create_pool() -> Pool {
 
 
 /// Every possible update which can happen during a query
-#[derive(Serialize, Debug)]
+#[derive(Serialize, Deserialize, Debug)]
 pub enum Update {
     Wealth(Wealth),
     ItemAdded(Item),
@@ -51,6 +51,20 @@ pub enum Update {
     ClaimRemoved(Claim),
 }
 
+impl Update {
+    /// Change back what has been updated
+    fn undo(self) -> QueryResult<()> {
+        match self {
+            Update::Wealth(diff) => {},
+            Update::ItemAdded(item) => {},
+            Update::ItemRemoved(item) => {},
+            Update::ClaimAdded(claim) => {},
+            Update::ClaimRemoved(claim) => {},
+        };
+        Ok(())
+    }
+}
+
 /// Every value which can be queried
 #[derive(Debug)]
 pub enum Value {