Azure learning error: Can't bind CosmosDB to type 'System.String'

Question

While doing the https://learn.microsoft.com/en-gb/learn/modules/chain-azure-functions-data-using-bindings/, "Exercise - Read data with input bindings", I'm getting error

> Can't bind CosmosDB to type 'System.String'. Possible causes: 1) Tried binding to 'Microsoft.Azure.Documents.Client.DocumentClient, Microsoft.Azure.DocumentDB.Core, Version=2.9.2.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35' but user type assembly was 'System.String, System.Private.CoreLib, Version=4.0.0.0, Culture=neutral, PublicKeyToken=7cec85d7bea7798e.

Everything is set correctly, exactly the same as specified in the tutorial (I've done it x3 to be sure).

Seems like a bug to me.

Answer 1

it worked for me:
https://stackoverflow.com/questions/61988060/azure-cosmos-db-input-binding-for-an-azure-function-doesnt-work

Answer 2

The value for id, partitionKey should be {id} to make it work
You should update the values in function.json like this:

 } 
       "name": "bookmark", 
       "direction": "in", 
       "type": "cosmosDB", 
       "databaseName": "func-io-learn-db", 
       "collectionName": "Bookmarks", 
       "connectionStringSetting": "exercise-app-sw1980_DOCUMENTDB", 
       "id": "{id}", 
       "partitionKey": "{id}" 
 }