PROJ001: Projection property not found

Field	Value
Code	PROJ001
Severity	Error

Message

Property '{0}' on projection '{1}' does not exist on source entity '{2}'

Description

All properties in a projection model must exist on the source entity. When you define a projection class with [DynamoDbProjection(typeof(SourceEntity))], every property declared in the projection must have a corresponding property with the same name on the source entity.

This diagnostic is emitted when a property name in the projection does not match any property on the referenced source entity. This typically occurs due to a typo in the property name or when the source entity has been refactored without updating the projection.

Example

The following code triggers this diagnostic:

[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
{
    // PROJ001: 'OrderStatus' does not exist on Order
    [DynamoDbAttribute("status")]
    public string OrderStatus { 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;
}