wip: checkpoint multi-game core work

src/models/objective.rs

@@ -21,6 +21,19 @@ pub enum ObjectiveMetric {
     CoinsEarned,
 }
 
+impl ObjectiveMetric {
+    pub fn as_str(&self) -> &'static str {
+        match self {
+            ObjectiveMetric::MatchesWon => "matcheswon",
+            ObjectiveMetric::MatchesPlayed => "matchesplayed",
+            ObjectiveMetric::GoalsScored => "goalsscored",
+            ObjectiveMetric::PacksOpened => "packsopened",
+            ObjectiveMetric::SbcsCompleted => "sbcscompleted",
+            ObjectiveMetric::CoinsEarned => "coinsearned",
+        }
+    }
+}
+
 /// Objective definition from data/objectives/*.json
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct ObjectiveDefinition {