chore: transact items to be a variadic function,type alias for TransactWriteItem type (#6)

- [x] transact items to be a variadic function
- [x] add type alias for TransactWriteItem type

Author: shidil

client.go

@@ -8,6 +8,7 @@ import (
 	"github.com/aws/aws-sdk-go-v2/config"
 	"github.com/aws/aws-sdk-go-v2/credentials"
 	"github.com/aws/aws-sdk-go-v2/service/dynamodb"
+	"github.com/aws/aws-sdk-go-v2/service/dynamodb/types"
 )
 
 type ClientOptions struct {
@@ -25,6 +26,8 @@ type Client struct {
 	Keys      map[string]string
 }
 
+type TransactWriteItem types.TransactWriteItem
+
 // Create a new instance of DynamoTable. internally creates aws connection configuration for the db
 // If DynamoTable.Endpoint is specified connects to the db at the given URL, or the default credential of the system is used
 // To connect to AWS DynamoDB from a running pod or EC2 instance, use the default credentials without Endpoint option

tests/transact_items_test.go

@@ -99,7 +99,7 @@ func TestTransactItems(t *testing.T) {
 			}
 			//perform operations
 			if len(tc.operations) > 0 {
-				err := table.TransactItems(ctx, tc.operations)
+				err := table.TransactItems(ctx, tc.operations...)
 				if err != nil {
 					t.Fatalf("error occurred %s", err)
 				}

transaction_items.go

@@ -46,7 +46,7 @@ func (t *Client) WithPutItem(pk string, sk string, item interface{}) types.Trans
 
 // TransactItems is a synchronous for writing or deletion operation performed in dynamodb grouped together
 
-func (t *Client) TransactItems(ctx context.Context, input []types.TransactWriteItem) error {
+func (t *Client) TransactItems(ctx context.Context, input ...types.TransactWriteItem) error {
 	_, err := t.client.TransactWriteItems(ctx, &dynamodb.TransactWriteItemsInput{
 		TransactItems: input,
 	})