feat: excel export for primitive fields

internal/extras/excel/exporter.go

@@ -0,0 +1,35 @@
+package excel
+
+type ExporterInterface interface {
+	GetSheetName() string
+	GetEntity() any
+	GetProvider() func() ([]any, error)
+}
+
+type Exporter[T any] struct {
+	SheetName string
+	Entity    T
+	Provider  func() ([]*T, error)
+}
+
+func (e Exporter[T]) GetSheetName() string {
+	return e.SheetName
+}
+
+func (e Exporter[T]) GetEntity() any {
+	return e.Entity
+}
+
+func (e Exporter[T]) GetProvider() func() ([]any, error) {
+	return func() ([]any, error) {
+		entities, err := e.Provider()
+		if err != nil {
+			return nil, err
+		}
+		result := make([]any, len(entities))
+		for i, entity := range entities {
+			result[i] = entity
+		}
+		return result, nil
+	}
+}