Azure Functions SDK

Question

After upgrading to 1.0.1 CLI tools without any code changes, I suddenly started to get the following error:

ResizeImage: Microsoft.Azure.WebJobs.Host: Error indexing method 'Functions.ResizeImage'. 
Microsoft.Azure.WebJobs.Extensions.DocumentDB:
 'Id' is required when binding to a DocumentClient property.

The following code:

[FunctionName(nameof(ResizeImage))]
public static async Task RunAsync([BlobTrigger("profile-pictures/{name}")] CloudBlockBlob myBlob, string name, [DocumentDB(databaseName: "x", collectionName: "UserProfile", CreateIfNotExists = true)] DocumentClient client, [Blob("profile-pictures/resized-{name}", FileAccess.ReadWrite)] CloudBlockBlob resizedBlob, TraceWriter log)

I thought Id is optional? At least that's what the docs says.

According to the docs:

The properties id and sqlQuery cannot both be specified. If neither id nor sqlQuery is set, the entire collection is retrieved.

The generated json:

{
  "bindings": [
    {
      "type": "blobTrigger",
      "path": "profile-pictures/{name}",
      "direction": "in",
      "name": "myBlob"
    },
    {
      "type": "documentDB",
      "databaseName": "x",
      "collectionName": "UserProfile",
      "createIfNotExists": true,
      "direction": "out",
      "name": "client"
    },
    {
      "type": "blob",
      "path": "profile-pictures/resized-{name}",
      "direction": "inout",
      "name": "resizedBlob"
    }
  ],
  "disabled": false,
  "scriptFile": "..\\X.Functions.dll",
  "entryPoint": "X.Functions.ResizeImage.RunAsync"
}

I'm using 1.0.0 SDK

Answer 1

I thought Id is optional? At least that's what the docs says.

Yes, id is optional. But according to the document of Azure Functions Cosmos DB bindings . We need to use IEnumerable<dynamic> as the binding type. Please change your code as following.

[DocumentDB(...)] IEnumerable<dynamic> documents

You will get all the documents from the collection. I tested it and it worked fine on my side.

In addition, the direction should be changed to in if you want to get data from DocumentDB.

"direction": "in"