Add cardsToNotes function

AnkiConnect.py

@@ -507,6 +507,10 @@ class AnkiBridge:
             return []
 
 
+    def cardsToNotes(self, cards):
+        return self.window().col.db.list('select distinct nid from cards where id in ' + anki.utils.ids2str(cards))
+
+
     def guiBrowse(self, query=None):
         browser = aqt.dialogs.open('Browser', self.window())
         browser.activateWindow()
@@ -781,6 +785,11 @@ class AnkiConnect:
         return self.anki.findCards(query)
 
 
+    @webApi
+    def cardsToNotes(self, cards):
+        return self.anki.cardsToNotes(cards)
+
+
     @webApi
     def guiBrowse(self, query=None):
         return self.anki.guiBrowse(query)

README.md

@@ -490,6 +490,29 @@ Below is a list of currently supported actions. Requests with invalid actions or
     ]
     ```
 
+*   **cardsToNotes**
+
+    Returns an (unordered) array of note IDs for the given card IDs. For cards with the same note, the ID is only
+    given once in the array.
+
+    *Sample request*:
+    ```
+    {
+        "action": "cardsToNotes",
+        "params": {
+            "cards": [1502098034045, 1502098034048, 1502298033753]
+        }
+    }
+    ```
+
+    *Sample response*:
+    ```
+    [
+        1502098029797,
+        1502298025183
+    ]
+    ```
+
 *   **guiBrowse**
 
     Invokes the card browser and searches for a given query. Returns an array of identifiers of the cards that were found.