DYNDB011: Multi-item entity missing partition key

Field	Value
Code	DYNDB011
Severity	Error

Message

Multi-item entity '{0}' must have a partition key for grouping related items

Description

Multi-item entities require a partition key to group related DynamoDB items together. Without a partition key, the source generator cannot determine how to associate parent and child items in composite entity queries.

Example

The following code triggers this diagnostic:

[DynamoDbTable("Invoices")]
public partial class Invoice
{
    [SortKey(Prefix = "INVOICE")]
    [DynamoDbAttribute("sk")]
    public string Sk { get; set; } = string.Empty;

    [RelatedEntity("INVOICE#*#LINE#*", EntityType = typeof(InvoiceLine))]
    public List<InvoiceLine> Lines { get; set; } = new();
}

Fix

The corrected version:

[DynamoDbTable("Invoices")]
public partial class Invoice
{
    [PartitionKey(Prefix = "CUSTOMER")]
    [DynamoDbAttribute("pk")]
    public string Pk { get; set; } = string.Empty;

    [SortKey(Prefix = "INVOICE")]
    [DynamoDbAttribute("sk")]
    public string Sk { get; set; } = string.Empty;

    [RelatedEntity("INVOICE#*#LINE#*", EntityType = typeof(InvoiceLine))]
    public List<InvoiceLine> Lines { get; set; } = new();
}