update

src/variant.rs

@@ -128,6 +128,18 @@ impl Variant {
         t._id
     }
 
+    pub async fn stat(&self) -> serde_json::Value {
+        let active_transactions = self.inventory().await;
+
+        // fix : ignores currency
+        let total_price: f64 = active_transactions.iter().map(|x| x.price.value).sum();
+
+        json!({
+            "amount": active_transactions.len(),
+            "total_price": total_price
+        })
+    }
+
     pub fn api_json(&self) -> serde_json::Value {
         json!({
             "item": self.item,