DYNDB002: Multiple partition keys

Field	Value
Code	DYNDB002
Severity	Error

Message

Entity '{0}' has multiple properties marked with [PartitionKey]. Only one is allowed.

Description

A DynamoDB entity can only have one partition key property. DynamoDB tables have a single partition key attribute, and the source generator enforces this constraint at compile time.

Example

The following code triggers this diagnostic:

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

    [PartitionKey]
    [DynamoDbAttribute("customerId")]
    public string CustomerId { get; set; } = string.Empty;
}

Fix

The corrected version:

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

    [DynamoDbAttribute("customerId")]
    public string CustomerId { get; set; } = string.Empty;
}