Function buildFieldMappings

mapper_func.go:36–68

buildFieldMappings 构建字段映射关系

(fromType, toType reflect.Type)

// buildFieldMappings 构建字段映射关系
func buildFieldMappings(fromType, toType reflect.Type) []fieldMapping {
	mappings := []fieldMapping{}
	
	for i := 0; i < fromType.NumField(); i++ {
		fromField := fromType.Field(i)
		
		// 尝试通过 mapper tag 或字段名找到对应字段
		fieldName := fromField.Name
		toField, found := toType.FieldByName(fieldName)
		if !found {
			// 尝试通过 mapper tag 查找
			if tag := fromField.Tag.Get("mapper"); tag != "" {
				if f, ok := toType.FieldByName(tag); ok {
					toField = f
					found = true
				}
			}
		}
		
		if found && fromField.Type == toField.Type {
			mappings = append(mappings, fieldMapping{
				fromIndex: []int{i},
				toIndex:   toField.Index[0],
			})
		}
	}
	
	// 存入缓存
	key := cacheKey(fromType, toType)
	fieldMappingCache.Store(key, mappings)
	
	return mappings
}

// ============ 函数式泛型 Mapper (优化版) ============