fix: call rule.beforeFunc position is error

validate.go

@@ -38,6 +38,11 @@ func (r *Rule) Apply(v *Validation) (stop bool) {
 			continue
 		}
 
+		// has beforeFunc. if return false, skip validate
+		if r.beforeFunc != nil && !r.beforeFunc(field, v) {
+			continue
+		}
+
 		// uploaded file check
 		if isFileValidator(name) {
 			// build and collect error message
@@ -85,18 +90,14 @@ func (r *Rule) Apply(v *Validation) (stop bool) {
 }
 
 func (r *Rule) fileValidate(field, name string, v *Validation) (ok bool) {
-	// beforeFunc return false, skip validate
-	if r.beforeFunc != nil && !r.beforeFunc(field, v) {
-		return false
-	}
-
+	// check data source
 	form, ok := v.data.(*FormData)
 	if !ok {
 		return
 	}
 
 	// skip on empty AND field not exist
-	if v.SkipOnEmpty && !form.HasFile(field) {
+	if r.skipEmpty && !form.HasFile(field) {
 		return true
 	}
 
@@ -132,11 +133,6 @@ func (r *Rule) valueValidate(field, name string, val interface{}, v *Validation)
 		return true
 	}
 
-	// beforeFunc return false, skip validate
-	if r.beforeFunc != nil && !r.beforeFunc(field, v) {
-		return false
-	}
-
 	// empty value AND skip on empty.
 	isNotRequired := name != "required"
 	if r.skipEmpty && isNotRequired && IsEmpty(val) {

validation_rule.go

@@ -33,8 +33,10 @@ type Rule struct {
 	validator string
 	// arguments for the validator
 	arguments []interface{}
-	// some functions
+	// --- some hook functions
+	// has beforeFunc. if return false, skip validate current rule
 	beforeFunc func(field string, v *Validation) bool // func (val interface{}) bool
+	// you can custom filter func
 	filterFunc func(val interface{}) (interface{}, error)
 	// custom check func's mate info
 	checkFuncMeta *funcMeta

validation_rule_test.go

@@ -4,6 +4,7 @@ import (
 	"net/url"
 	"testing"
 
+	"github.com/gookit/filter"
 	"github.com/stretchr/testify/assert"
 )
 
@@ -49,5 +50,43 @@ func TestRule(t *testing.T) {
 }
 
 func TestRule_SetBeforeFunc(t *testing.T) {
+	is := assert.New(t)
+	mp := M{
+		"name":   "inhere",
+		"avatar": "/some/file",
+	}
+
+	v := Map(mp)
+	v.AddRule("avatar", "isFile")
+	is.False(v.Validate())
+	is.Equal("avatar must be an uploaded file", v.Errors.One())
+
+	// use SetBeforeFunc
+	v = Map(mp)
+	v.
+		AddRule("avatar", "isFile").
+		SetBeforeFunc(func(field string, v *Validation) bool {
+			// return false for skip validate
+			return false
+		})
+
+	v.Validate()
+	is.True(v.IsOK())
+}
+
+func TestRule_SetFilterFunc(t *testing.T) {
+	is := assert.New(t)
+	v := Map(M{
+		"name": "inhere",
+		"age": "abc",
+	})
+
+	v.
+		AddRule("age", "int", 1, 100).
+		SetFilterFunc(func(val interface{}) (i interface{}, e error) {
+			return filter.Int(val)
+		})
 
+	is.False(v.Validate())
+	is.Equal(`strconv.Atoi: parsing "abc": invalid syntax`, v.Errors.One())
 }

validators.go

@@ -594,7 +594,7 @@ func IsInt(val interface{}, minAndMax ...int64) (ok bool) {
 	return intVal >= minVal && intVal <= maxVal
 }
 
-// IsString check, and support length check.
+// IsString check and support length check.
 // Usage:
 // 	ok := IsString(val)
 // 	ok := IsString(val, 5) // with min len check