add missed method Cursor::primary_key

Author: Ekleog

src/cursor.rs

@@ -172,6 +172,16 @@ impl<Err> Cursor<Err> {
         })
     }
 
+    /// Retrieve the primary key this [`Cursor`] is currently pointing at, or `None` if the cursor is completed
+    ///
+    /// Internally, this uses the [`IDBCursor::primaryKey`](https://developer.mozilla.org/en-US/docs/Web/API/IDBCursor/key) property.
+    pub fn primary_key(&self) -> Option<JsValue> {
+        self.sys.as_ref().map(|sys| {
+            sys.primary_key()
+                .expect("Failed retrieving primary key from known-good cursor")
+        })
+    }
+
     /// Advance this [`Cursor`] by `count` elements
     ///
     /// Internally, this uses [`IDBCursor::advance`](https://developer.mozilla.org/en-US/docs/Web/API/IDBCursor/advance).

tests/js.rs

@@ -200,16 +200,16 @@ async fn smoke_test() {
             let mut all = Vec::new();
             let mut cursor = stuffs.cursor().open().await.unwrap();
             while let Some(val) = cursor.value() {
-                all.push(val);
+                all.push((cursor.primary_key().unwrap(), val));
                 cursor.delete().await.unwrap();
                 cursor.advance(1).await.unwrap();
             }
             assert_eq!(
                 all,
                 vec![
-                    (**JsString::from("value3")).clone(),
-                    (**JsString::from("value2")).clone(),
-                    (**JsString::from("value1")).clone()
+                    (JsValue::from(3), (**JsString::from("value3")).clone()),
+                    (JsValue::from(4), (**JsString::from("value2")).clone()),
+                    (JsValue::from(5), (**JsString::from("value1")).clone())
                 ]
             );
             assert_eq!(stuffs.count().await.unwrap(), 0);