Porting Back fixes from v6

baked_in.go

@@ -424,10 +424,12 @@ func hasValue(top interface{}, current interface{}, field interface{}, param str
 	st := reflect.ValueOf(field)
 
 	switch st.Kind() {
-
-	case reflect.Slice, reflect.Map, reflect.Array:
-		return field != nil && int64(st.Len()) > 0
-
+	case reflect.Invalid:
+		return false
+	case reflect.Slice, reflect.Map, reflect.Ptr, reflect.Interface, reflect.Chan, reflect.Func:
+		return !st.IsNil()
+	case reflect.Array:
+		return field != reflect.Zero(reflect.TypeOf(field)).Interface()
 	default:
 		return field != nil && field != reflect.Zero(reflect.TypeOf(field)).Interface()
 	}

doc.go

@@ -193,9 +193,10 @@ Here is a list of the current built in validators:
 		within its SliceOrArrayErrs or MapErrs fields.
 
 	required
-		This validates that the value is not the data types default value.
+		This validates that the value is not the data types default zero value.
 		For numbers ensures value is not zero. For strings ensures value is
-		not "". For slices, arrays, and maps, ensures the length is not zero.
+		not "". For slices, maps, pointers, interfaces, channels and functions
+		ensures the value is not nil.
 		(Usage: required)
 
 	len

validator.go

@@ -627,7 +627,11 @@ func (v *Validate) fieldWithNameAndValue(val interface{}, current interface{}, f
 			f = valueField.Interface()
 		}
 
-		cField = &cachedField{name: name, kind: valueField.Kind(), tag: tag, typ: valueField.Type()}
+		cField = &cachedField{name: name, kind: valueField.Kind(), tag: tag}
+
+		if cField.kind != reflect.Invalid {
+			cField.typ = valueField.Type()
+		}
 
 		switch cField.kind {
 		case reflect.Slice, reflect.Array:
@@ -648,8 +652,14 @@ func (v *Validate) fieldWithNameAndValue(val interface{}, current interface{}, f
 	}
 
 	switch cField.kind {
+	case reflect.Invalid:
+		return &FieldError{
+			Field: cField.name,
+			Tag:   cField.tag,
+			Kind:  cField.kind,
+		}
 
-	case reflect.Struct, reflect.Interface, reflect.Invalid:
+	case reflect.Struct, reflect.Interface:
 
 		if cField.typ != reflect.TypeOf(time.Time{}) {
 			panic("Invalid field passed to fieldWithNameAndValue")

validator_test.go

@@ -231,6 +231,82 @@ func AssertMapFieldError(t *testing.T, s map[string]*FieldError, field string, e
 	EqualSkip(t, 2, val.Tag, expectedTag)
 }
 
+func TestSliceMapArrayChanFuncPtrInterfaceRequiredValidation(t *testing.T) {
+
+	var m map[string]string
+
+	errs := validate.Field(m, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	m = map[string]string{}
+	errs = validate.Field(m, "required")
+	Equal(t, errs, nil)
+
+	var arr [5]string
+	errs = validate.Field(arr, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	arr[0] = "ok"
+	errs = validate.Field(arr, "required")
+	Equal(t, errs, nil)
+
+	var s []string
+	errs = validate.Field(s, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	s = []string{}
+	errs = validate.Field(s, "required")
+	Equal(t, errs, nil)
+
+	var c chan string
+	errs = validate.Field(c, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	c = make(chan string)
+	errs = validate.Field(c, "required")
+	Equal(t, errs, nil)
+
+	var tst *int
+	errs = validate.Field(tst, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	one := 1
+	tst = &one
+	errs = validate.Field(tst, "required")
+	Equal(t, errs, nil)
+
+	var iface interface{}
+
+	errs = validate.Field(iface, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	errs = validate.Field(iface, "omitempty,required")
+	Equal(t, errs, nil)
+
+	errs = validate.Field(iface, "")
+	Equal(t, errs, nil)
+
+	errs = validate.Field(iface, "len=1")
+	NotEqual(t, errs, nil)
+
+	var f func(string)
+
+	errs = validate.Field(f, "required")
+	NotEqual(t, errs, nil)
+	// AssertError(t, errs, "", "", "required")
+
+	f = func(name string) {}
+
+	errs = validate.Field(f, "required")
+	Equal(t, errs, nil)
+}
+
 func TestBadKeyValidation(t *testing.T) {
 	type Test struct {
 		Name string `validate:"required, "`
@@ -3735,14 +3811,14 @@ func TestStructSliceValidation(t *testing.T) {
 		Min:       []int{1, 2},
 		Max:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0},
 		MinMax:    []int{1, 2, 3, 4, 5},
-		OmitEmpty: []int{},
+		OmitEmpty: nil,
 	}
 
 	err := validate.Struct(tSuccess)
 	Equal(t, err, nil)
 
 	tFail := &TestSlice{
-		Required:  []int{},
+		Required:  nil,
 		Len:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1},
 		Min:       []int{},
 		Max:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1},
@@ -3810,7 +3886,7 @@ func TestPoolObjectMaxSizeValidation(t *testing.T) {
 		Min:       []int{1, 2},
 		Max:       []int{1, 2, 3, 4, 5, 6, 7, 8, 9, 0},
 		MinMax:    []int{1, 2, 3, 4, 5},
-		OmitEmpty: []int{},
+		OmitEmpty: nil,
 	}
 
 	for i := 0; i < 2; i++ {