mapped values to dropdown

fields.go

@@ -3,15 +3,16 @@ package form
 type FieldType string
 
 const (
-	FieldTypeGroup     FieldType = "group"
-	FieldTypeCheckbox  FieldType = "checkbox"
-	FieldTypeChecklist FieldType = "checklist"
-	FieldTypeInput     FieldType = "input"
-	FieldTypeLabel     FieldType = "label"
-	FieldTypeRadios    FieldType = "radios"
-	FieldTypeDropdown  FieldType = "dropdown"
-	FieldTypeSubmit    FieldType = "submit"
-	FieldTypeTextArea  FieldType = "textArea"
+	FieldTypeGroup          FieldType = "group"
+	FieldTypeCheckbox       FieldType = "checkbox"
+	FieldTypeChecklist      FieldType = "checklist"
+	FieldTypeInput          FieldType = "input"
+	FieldTypeLabel          FieldType = "label"
+	FieldTypeRadios         FieldType = "radios"
+	FieldTypeDropdown       FieldType = "dropdown"
+	FieldTypeDropdownMapped FieldType = "dropdownmapped"
+	FieldTypeSubmit         FieldType = "submit"
+	FieldTypeTextArea       FieldType = "textArea"
 )
 
 type InputFieldType string

transformer.go

@@ -9,10 +9,15 @@ import (
 
 type (
 	Enumerator interface{ Enum() []any }
+	Mapper     interface {
+		Mapper() map[string]string
+		String() string
+	}
 )
 
 var (
-	enumType = reflect.TypeOf((*Enumerator)(nil)).Elem()
+	enumType   = reflect.TypeOf((*Enumerator)(nil)).Elem()
+	mapperType = reflect.TypeOf((*Mapper)(nil)).Elem()
 )
 
 type Transformer struct {
@@ -94,6 +99,24 @@ func (t *Transformer) scanModel(rValue reflect.Value, rType reflect.Type, names
 			continue
 		}
 
+		if rType.Field(i).Type.Implements(mapperType) {
+			maps := rValue.Field(i).Interface().(Mapper).Mapper()
+			var fieldValue []FieldValue
+			for k, v := range maps {
+				fieldValue = append(fieldValue, FieldValue{
+					Value:    k,
+					Name:     v,
+					Disabled: false,
+				})
+			}
+
+			field.Type = FieldTypeDropdownMapped
+			field.Values = fieldValue
+
+			fields = append(fields, field)
+			continue
+		}
+
 		inputType := InputFieldType(tags.Get("inputType"))
 
 		fType := rType.Field(i).Type