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DYNDB015: Invalid related entity type

FieldValue
CodeDYNDB015
SeverityError

Message​

Related entity property '{0}' references unknown type '{1}'

Description​

Related entity types must be valid DynamoDB entity classes. The type specified in the EntityType property of [RelatedEntity] must exist in the compilation and be decorated with [DynamoDbTable].

Example​

The following code triggers this diagnostic:

[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(LineItem))]
    public List<LineItem> Lines { get; set; } = new();
}
// LineItem class does not exist or is not a DynamoDB entity

Fix​

The corrected version:

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

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

[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();
}