DYNDB103: Missing blob provider package

Field	Value
Code	DYNDB103
Severity	Error

Message

[BlobStorage] on property '{0}' requires referencing a blob provider package like Oproto.FluentDynamoDb.BlobStorage.S3

Description

Blob storage requires a blob provider package reference. The [BlobStorage] attribute offloads large data to external storage (e.g., S3), but needs a provider package to handle the actual upload/download operations.

Example

The following code triggers this diagnostic:

// Project does NOT reference BlobStorage.S3 package
[DynamoDbTable("Documents")]
public partial class Document
{
    [PartitionKey]
    [DynamoDbAttribute("pk")]
    public string Pk { get; set; } = string.Empty;

    [BlobStorage]
    [DynamoDbAttribute("content")]
    public BlobData<byte[]> Content { get; set; } = default!;
}

Fix

The corrected version:

<!-- Add to your .csproj file -->
<PackageReference Include="Oproto.FluentDynamoDb.BlobStorage.S3" />

[DynamoDbTable("Documents")]
public partial class Document
{
    [PartitionKey]
    [DynamoDbAttribute("pk")]
    public string Pk { get; set; } = string.Empty;

    [BlobStorage]
    [DynamoDbAttribute("content")]
    public BlobData<byte[]> Content { get; set; } = default!;
}