struct can be null flag

validator_instance.go

@@ -150,14 +150,14 @@ func (v *Validate) SetTagName(name string) {
 	v.tagName = name
 }
 
-const omitemptyStructPrefix = "__omitempty_struct__"
+const omitemptyPrefix = "__omitempty__"
 
 // ValidateMapCtx validates a map using a map of validation rules and allows passing of contextual
 // validation validation information via context.Context.
 func (v Validate) ValidateMapCtx(ctx context.Context, data map[string]interface{}, rules map[string]interface{}) map[string]interface{} {
 	errs := make(map[string]interface{})
 	for field, rule := range rules {
-		if strings.HasPrefix(field, omitemptyStructPrefix) == true {
+		if strings.HasPrefix(field, omitemptyPrefix) == true {
 			continue
 		}
 		if ruleObj, ok := rule.(map[string]interface{}); ok {
@@ -170,20 +170,27 @@ func (v Validate) ValidateMapCtx(ctx context.Context, data map[string]interface{
 				} else {
 					errs[field] = errors.New("The field: '" + field + "' is not a map to dive")
 				}
-			} else if _, ok := rules[fmt.Sprintf("%s%s", omitemptyStructPrefix, field)].(string); ok {
-				// struct can be null
+			} else if _, ok := rules[fmt.Sprintf("%s%s", omitemptyPrefix, field)].(string); ok {
+				// can be null
 				continue
 			} else {
 				errs[field] = errors.New("The field: '" + field + "' is not a map to dive")
 			}
 		} else if arrRuleObj, ok := rule.([]map[string]interface{}); ok {
-			if dataObjs, ok := data[field].([]map[string]interface{}); ok && len(arrRuleObj) > 0 {
-				for _, obj := range dataObjs {
-					err := v.ValidateMapCtx(ctx, obj, arrRuleObj[0])
-					if len(err) > 0 {
-						errs[field] = err
+			if dataObjs, ok := data[field]; ok {
+				if do, ok := dataObjs.([]map[string]interface{}); ok && len(arrRuleObj) > 0 {
+					for _, obj := range do {
+						err := v.ValidateMapCtx(ctx, obj, arrRuleObj[0])
+						if len(err) > 0 {
+							errs[field] = err
+						}
 					}
+				} else {
+					errs[field] = errors.New("The field: '" + field + "' is not a map array")
 				}
+			} else if _, ok := rules[fmt.Sprintf("%s%s", omitemptyPrefix, field)].(string); ok {
+				// can be null
+				continue
 			} else {
 				errs[field] = errors.New("The field: '" + field + "' is not a map array")
 			}