Merge pull request #3 from spring-media/add-col-header-rename

add TargetName to cols to allow renaming header col names

pkg/csvexport/csv.go

@@ -37,6 +37,8 @@ type Columns []Column
 
 type Column struct {
 	Name string
+	// If TargetName is set, Name gets renamed to TargetName in header
+	TargetName string
 	// If OverwriteValue is set to true, all values of the column are set to OverwriteWithValue.
 	OverwriteValue     bool
 	OverwriteWithValue interface{}
@@ -66,6 +68,7 @@ func DynamoToCSV(db Storage, ctx context.Context, scanOpt ScanOption, opts ...Op
 	var csvExp CSVExporter
 
 	var keyOrder []string
+	var header []string
 
 	for _, opt := range opts {
 		opt(&csvExp)
@@ -83,6 +86,14 @@ func DynamoToCSV(db Storage, ctx context.Context, scanOpt ScanOption, opts ...Op
 			if count == 0 {
 				for _, v := range csvExp.cols {
 					keyOrder = append(keyOrder, v.Name)
+
+					headerName := v.Name
+
+					if v.TargetName != "" {
+						headerName = v.TargetName
+					}
+
+					header = append(header, headerName)
 				}
 
 				if len(keyOrder) == 0 {
@@ -91,9 +102,11 @@ func DynamoToCSV(db Storage, ctx context.Context, scanOpt ScanOption, opts ...Op
 					}
 
 					sort.Strings(keyOrder)
+
+					header = keyOrder
 				}
 
-				_ = w.Write(keyOrder)
+				_ = w.Write(header)
 			}
 
 			record := make([]string, 0, len(keyOrder))

pkg/csvexport/csv_test.go

@@ -110,3 +110,21 @@ func TestDynamoToCSVWithCols(t *testing.T) {
 `
 	assert.Equal(t, expectedCSV, string(b))
 }
+
+func TestDynamoToCSVWithColsTargetName(t *testing.T) {
+	t.Parallel()
+	db := mockScan{resp: dynamoMockResp}
+	cols := csvexport.Columns{
+		csvexport.Column{Name: "ArticleLastUpdated"},
+		csvexport.Column{Name: "PerformanceLastUpdated", TargetName: "PerformanceUpdatedLast"},
+	}
+	b, err := csvexport.DynamoToCSV(db, context.Background(), csvexport.ScanOption{}, csvexport.WithColumns(cols))
+
+	assert.Nil(t, err)
+
+	expectedCSV := `ArticleLastUpdated,PerformanceUpdatedLast
+2022-04-27T08:36:48.386Z,2022-04-27T13:10:30Z
+2022-04-28T08:36:48.386Z,2022-04-28T13:10:30Z
+`
+	assert.Equal(t, expectedCSV, string(b))
+}