feat: custom rule method added

after.go

@@ -23,7 +23,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) After(t, u time.Time, field, msg string) Validator {
-	v.Check(t.After(u), field, v.msg(After, msg, field, u))
+	v.check(t.After(u), field, v.msg(After, msg, field, u))
 
 	return v
 }

before.go

@@ -23,7 +23,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) Before(t, u time.Time, field, msg string) Validator {
-	v.Check(t.Before(u), field, v.msg(Before, msg, field, u))
+	v.check(t.Before(u), field, v.msg(Before, msg, field, u))
 
 	return v
 }

between.go

@@ -17,7 +17,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) BetweenInt(i, min, max int, field, msg string) Validator {
-	v.Check(i >= min && i <= max, field, v.msg(Between, msg, field, min, max))
+	v.check(i >= min && i <= max, field, v.msg(Between, msg, field, min, max))
 
 	return v
 }
@@ -32,7 +32,7 @@ func (v Validator) BetweenInt(i, min, max int, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) BetweenFloat(f, min, max float64, field, msg string) Validator {
-	v.Check(f >= min && f <= max, field, v.msg(Between, msg, field, min, max))
+	v.check(f >= min && f <= max, field, v.msg(Between, msg, field, min, max))
 
 	return v
 }

custom.go

@@ -0,0 +1,11 @@
+package govalidator
+
+// CustomRule is a dynamic method to define any custom validation rule by passing a rule as a function or expression
+// which will return a boolean.
+func (v Validator) CustomRule(ok bool, field, msg string) Validator {
+	if !ok {
+		v.addError(field, msg)
+	}
+
+	return v
+}

custom_test.go

@@ -0,0 +1,70 @@
+package govalidator
+
+import (
+	"github.com/stretchr/testify/assert"
+	"testing"
+)
+
+func Test_CustomRule(t *testing.T) {
+	tests := []struct {
+		name        string
+		field       string
+		value       bool
+		isPassed    bool
+		msg         string
+		expectedMsg string
+	}{
+		{
+			name:        "test CustomRule with true condition",
+			value:       true,
+			field:       "username",
+			msg:         "",
+			isPassed:    true,
+			expectedMsg: "",
+		},
+		{
+			name:        "test CustomRule with false condition and custom message",
+			value:       false,
+			field:       "username",
+			msg:         "username must be unique",
+			isPassed:    false,
+			expectedMsg: "username must be unique",
+		},
+		{
+			name:        "test CustomRule with false condition and empty message",
+			value:       false,
+			field:       "email",
+			msg:         "",
+			isPassed:    false,
+			expectedMsg: "",
+		},
+		{
+			name:        "test CustomRule with true condition and custom message",
+			value:       true,
+			field:       "email",
+			msg:         "email must be valid",
+			isPassed:    true,
+			expectedMsg: "",
+		},
+	}
+
+	for _, test := range tests {
+		v := New()
+
+		v.CustomRule(test.value, test.field, test.msg)
+
+		assert.Equal(t, test.isPassed, v.IsPassed(), test.name)
+
+		if !test.isPassed {
+			assert.Equalf(
+				t,
+				test.expectedMsg,
+				v.Errors()[test.field],
+				"test case %q failed, expected: %s, got: %s",
+				test.name,
+				test.expectedMsg,
+				v.Errors()[test.field],
+			)
+		}
+	}
+}

date.go

@@ -23,7 +23,7 @@ const (
 func (v Validator) Date(layout, d, field, msg string) Validator {
 	_, err := time.Parse(layout, d)
 	if err != nil {
-		v.Check(false, field, v.msg(Date, msg, field))
+		v.check(false, field, v.msg(Date, msg, field))
 	}
 
 	return v

exists.go

@@ -17,7 +17,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) Exists(value any, table, column, field, msg string) Validator {
-	v.Check(v.repo.Exists(value, table, column), field, v.msg(Exists, msg, field))
+	v.check(v.repo.Exists(value, table, column), field, v.msg(Exists, msg, field))
 
 	return v
 }

exists_test.go

@@ -38,6 +38,21 @@ func (repo) Exists(value any, table, column string) bool {
 	return false
 }
 
+func (repo) ExistsExceptSelf(value any, table, column string, selfID int) bool {
+	data, exists := tables[table]
+	if !exists {
+		return false
+	}
+
+	for _, item := range data {
+		if item[column] == value {
+			return true
+		}
+	}
+
+	return false
+}
+
 func TestValidator_Exists(t *testing.T) {
 	tests := []struct {
 		name        string

ip.go

@@ -21,7 +21,7 @@ const (
 func (v Validator) IP4(s, field, msg string) Validator {
 	ip := net.ParseIP(s)
 
-	v.Check(ip != nil && ip.To4() != nil, field, v.msg(IP4, msg, field))
+	v.check(ip != nil && ip.To4() != nil, field, v.msg(IP4, msg, field))
 
 	return v
 }

len.go

@@ -27,7 +27,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) LenString(s string, size int, field, msg string) Validator {
-	v.Check(utf8.RuneCountInString(strings.TrimSpace(s)) == size, field, v.msg(Len, msg, field, size))
+	v.check(utf8.RuneCountInString(strings.TrimSpace(s)) == size, field, v.msg(Len, msg, field, size))
 
 	return v
 }
@@ -42,7 +42,7 @@ func (v Validator) LenString(s string, size int, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) LenInt(i, size int, field, msg string) Validator {
-	v.Check(len(strconv.Itoa(i)) == size, field, v.msg(Len, msg, field, size))
+	v.check(len(strconv.Itoa(i)) == size, field, v.msg(Len, msg, field, size))
 
 	return v
 }
@@ -57,7 +57,7 @@ func (v Validator) LenInt(i, size int, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) LenSlice(s []any, size int, field, msg string) Validator {
-	v.Check(len(s) == size, field, v.msg(LenList, msg, field, size))
+	v.check(len(s) == size, field, v.msg(LenList, msg, field, size))
 
 	return v
 }

max.go

@@ -26,7 +26,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) MaxInt(i, max int, field, msg string) Validator {
-	v.Check(i <= max, field, v.msg(Max, msg, field, max))
+	v.check(i <= max, field, v.msg(Max, msg, field, max))
 
 	return v
 }
@@ -41,7 +41,7 @@ func (v Validator) MaxInt(i, max int, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) MaxFloat(f, max float64, field, msg string) Validator {
-	v.Check(f <= max, field, v.msg(Max, msg, field, max))
+	v.check(f <= max, field, v.msg(Max, msg, field, max))
 
 	return v
 }
@@ -56,7 +56,7 @@ func (v Validator) MaxFloat(f, max float64, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) MaxString(s string, maxLen int, field, msg string) Validator {
-	v.Check(utf8.RuneCountInString(strings.TrimSpace(s)) <= maxLen, field, v.msg(MaxString, msg, field, maxLen))
+	v.check(utf8.RuneCountInString(strings.TrimSpace(s)) <= maxLen, field, v.msg(MaxString, msg, field, maxLen))
 
 	return v
 }

min.go

@@ -26,7 +26,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) MinInt(i, min int, field, msg string) Validator {
-	v.Check(i >= min, field, v.msg(Min, msg, field, min))
+	v.check(i >= min, field, v.msg(Min, msg, field, min))
 
 	return v
 }
@@ -41,7 +41,7 @@ func (v Validator) MinInt(i, min int, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) MinFloat(f, min float64, field, msg string) Validator {
-	v.Check(f >= min, field, v.msg(Min, msg, field, min))
+	v.check(f >= min, field, v.msg(Min, msg, field, min))
 
 	return v
 }
@@ -56,7 +56,7 @@ func (v Validator) MinFloat(f, min float64, field, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) MinString(s string, minLen int, field, msg string) Validator {
-	v.Check(utf8.RuneCountInString(strings.TrimSpace(s)) >= minLen, field, v.msg(MinString, msg, field, minLen))
+	v.check(utf8.RuneCountInString(strings.TrimSpace(s)) >= minLen, field, v.msg(MinString, msg, field, minLen))
 
 	return v
 }

notexists.go

@@ -18,7 +18,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) NotExists(value any, table, column, field, msg string) Validator {
-	v.Check(!v.repo.Exists(value, table, column), field, v.msg(NotExists, msg, field))
+	v.check(!v.repo.Exists(value, table, column), field, v.msg(NotExists, msg, field))
 
 	return v
 }

regex.go

@@ -21,7 +21,7 @@ const (
 func (v Validator) RegexMatches(s string, pattern string, field, msg string) Validator {
 	r := regexp.MustCompile(pattern)
 
-	v.Check(r.Match([]byte(s)), field, v.msg(Regex, msg))
+	v.check(r.Match([]byte(s)), field, v.msg(Regex, msg))
 
 	return v
 }

required.go

@@ -19,7 +19,7 @@ const (
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) RequiredString(s, field string, msg string) Validator {
-	v.Check(strings.TrimSpace(s) != "", field, v.msg(Required, msg, field))
+	v.check(strings.TrimSpace(s) != "", field, v.msg(Required, msg, field))
 
 	return v
 }
@@ -34,7 +34,7 @@ func (v Validator) RequiredString(s, field string, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) RequiredInt(i int, field string, msg string) Validator {
-	v.Check(i != 0, field, v.msg(Required, msg, field))
+	v.check(i != 0, field, v.msg(Required, msg, field))
 
 	return v
 }
@@ -49,7 +49,7 @@ func (v Validator) RequiredInt(i int, field string, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) RequiredSlice(s []any, field string, msg string) Validator {
-	v.Check(len(s) > 0, field, v.msg(Required, msg, field))
+	v.check(len(s) > 0, field, v.msg(Required, msg, field))
 
 	return v
 }
@@ -64,7 +64,7 @@ func (v Validator) RequiredSlice(s []any, field string, msg string) Validator {
 //		 fmt.Printf("validation errors: %#v\n", v.Errors())
 //	}
 func (v Validator) RequiredFloat(f float64, field string, msg string) Validator {
-	v.Check(f != 0.0, field, v.msg(Required, msg, field))
+	v.check(f != 0.0, field, v.msg(Required, msg, field))
 
 	return v
 }

url.go

@@ -23,7 +23,7 @@ const (
 func (v Validator) URL(s, field, msg string) Validator {
 	u, err := url.Parse(s)
 
-	v.Check(err == nil && u.Scheme != "" && u.Host != "", field, v.msg(URL, msg, field))
+	v.check(err == nil && u.Scheme != "" && u.Host != "", field, v.msg(URL, msg, field))
 
 	return v
 }

uuid.go

@@ -23,7 +23,7 @@ const (
 func (v Validator) UUID(u, field, msg string) Validator {
 	_, err := uuid.Parse(u)
 	if err != nil {
-		v.Check(false, field, v.msg(UUID, msg, field))
+		v.check(false, field, v.msg(UUID, msg, field))
 
 		return v
 	}

validator.go

@@ -11,6 +11,7 @@ type (
 	// check a record exists on database or not.
 	Repository interface {
 		Exists(value any, table, column string) bool
+		ExistsExceptSelf(value any, table, column string, selfID int) bool
 	}
 
 	// Validator represents the validator structure
@@ -80,9 +81,8 @@ func (v Validator) Errors() map[string]string {
 	return v.errs
 }
 
-// Check is a dynamic method to define any custom validator rule by passing a rule as a function or expression
-// which will return a boolean.
-func (v Validator) Check(ok bool, field, msg string) {
+// check is the internal method easily validate each validator method result
+func (v Validator) check(ok bool, field, msg string) {
 	if !ok {
 		v.addError(field, msg)
 	}