//--- Methods ---
private void PrepareRequest(bool fetchAllAttributes)
{
// inherit the expected types from the query select construct
foreach (var expectedType in _queryClause.TypeFilters)
{
_converter.AddExpectedType(expectedType);
}
// initialize request
_request.IndexName = _queryClause.IndexName;
_request.KeyConditionExpression = _queryClause.GetKeyConditionExpression(_converter);
_request.FilterExpression = _converter.ConvertConditions(_table.Options);
_request.ProjectionExpression = _converter.ConvertProjections();
// NOTE (2021-06-23, bjorg): the following logic matches the default behavior, but makes it explicit
// if `ProjectionExpression` is set, only return specified attributes; otherwise, for an index, return projected attributes only; for tables, return all attributes from each row
if (_request.ProjectionExpression is null)
{
if ((_request.IndexName is null) || fetchAllAttributes)
{
_request.Select = Select.ALL_ATTRIBUTES;
}
else
{
_request.Select = Select.ALL_PROJECTED_ATTRIBUTES;
}
}
//--- Methods ---
public IDynamoTableTransactGetItemsBegin <TRecord> BeginGetItem <TRecord>(DynamoPrimaryKey <TRecord> primaryKey, bool consistentRead = false) where TRecord : class
{
// transaction GetItem
var transactGetItem = new TransactGetItem {
Get = new Get {
TableName = _table.TableName,
Key = new Dictionary <string, AttributeValue> {
[primaryKey.PKName] = new AttributeValue(primaryKey.PKValue),
[primaryKey.SKName] = new AttributeValue(primaryKey.SKValue)
}
}
};
_request.TransactItems.Add(transactGetItem);
// add expressions converter
var converter = new DynamoRequestConverter(transactGetItem.Get.ExpressionAttributeNames, _table.SerializerOptions);
_converters.Add(converter);
// register expected type
converter.AddExpectedType(typeof(TRecord));
return(new DynamoTableTransactGetItemsEntry <TRecord>(this, converter));
}
