impls undoable events

lootalot_db/src/models/history.rs

@@ -9,6 +9,9 @@ use crate::{DbConnection, QueryResult, Update};
 #[derive(Debug, FromSqlRow)]
 pub struct UpdateList(Vec<Update>);
 
+// TODO: decide if updates is really optionnal or not
+// (like if storing an event without update is usefull ?)
+
 /// An event in history
 #[derive(Debug, Queryable)]
 pub struct Event {
@@ -19,6 +22,26 @@ pub struct Event {
     updates: Option<UpdateList>,
 }
 
+impl Event {
+    pub fn name(&self) -> &str {
+        &self.text
+    }
+
+    /// TODO: why a move here ??
+    /// Undo all updates in a single transaction
+    pub fn undo(self, conn: &DbConnection) -> QueryResult<Self> {
+        conn.transaction(move || {
+            if let Some(ref updates) = self.updates {
+                for update in updates.0.iter() {
+                    update.undo(conn, self.player_id)?;
+                }
+                diesel::delete(history::table.find(self.id)).execute(conn)?;
+            }
+            Ok(self)
+        })
+    }
+}
+
 impl<DB: Backend> FromSql<Text, DB> for UpdateList
 where
     String: FromSql<Text, DB>,
@@ -38,7 +61,11 @@ struct NewEvent<'a> {
     updates: Option<String>,
 }
 
+
 /// Insert a new event
+///
+/// # Warning
+/// This actually swallow up conversion errors
 pub fn insert_event(conn: &DbConnection, id: i32, text: &str, updates: &Vec<Update>) -> QueryResult<Event> {
     diesel::insert_into(history::table)
         .values(&NewEvent {