FDDB051: Non-partial table type

Field	Value
Code	FDDB051
Severity	Error

Message

Type '{0}' must be declared as partial when used in [DynamoDbTable(typeof({0}))]

Description

When using type-based table references with [DynamoDbTable(typeof(T))], the referenced type must be declared as a partial class to allow the source generator to add implementation code.

Type-based table references provide compile-time safety for table name resolution. The referenced type becomes the generated table class, so it must be partial to receive the generated members.

Example

The following code triggers this diagnostic:

// Non-partial table type
public class OrdersTable { }

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

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

Fix

The corrected version:

// Declared as partial
public partial class OrdersTable { }

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

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