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PROJ003: Invalid projection source entity

FieldValue
CodePROJ003
SeverityError

Message​

Source entity type '{0}' for projection '{1}' does not exist or is not a DynamoDB entity

Description​

Projection source entity must be a valid DynamoDB entity class. The type passed to [DynamoDbProjection(typeof(...))] must reference an existing class that is decorated with [DynamoDbTable].

This diagnostic is emitted when the source entity type cannot be found at compile time or when the referenced type is not a valid DynamoDB entity. This can occur when the type name is misspelled, the referenced class has been removed, or the type exists but lacks the [DynamoDbTable] attribute.

Example​

The following code triggers this diagnostic:

// PROJ003: 'OrderEntity' does not exist or is not a DynamoDB entity
[DynamoDbProjection(typeof(OrderEntity))]
public partial class OrderSummary
{
    [DynamoDbAttribute("status")]
    public string Status { 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("status")]
    public string Status { get; set; } = string.Empty;
}

[DynamoDbProjection(typeof(Order))]
public partial class OrderSummary
{
    [DynamoDbAttribute("status")]
    public string Status { get; set; } = string.Empty;
}