Add RecordNotFound tests for method Related

README.md

@@ -830,12 +830,17 @@ if err := db.Where("name = ?", "jinzhu").First(&user).Error; err != nil {
 
 // If no record found, gorm will return RecordNotFound error, you could check it with
 db.Where("name = ?", "hello world").First(&User{}).Error == gorm.RecordNotFound
-// or use shortcut
+
+// Or use shortcut method
 if db.Where("name = ?", "hello world").First(&user).RecordNotFound() {
   panic("no record found")
 } else {
   user.Blalala()
 }
+
+if db.Model(&user).Related(&credit_card).RecordNotFound() {
+  panic("no credit card found")
+}
 ```
 
 ## Advanced Usage With Query Chain

gorm_test.go

@@ -1282,6 +1282,10 @@ func TestRelated(t *testing.T) {
 	if user3.Id != user.Id || user3.Name != user.Name {
 		t.Errorf("Should get user from credit card correctly")
 	}
+
+	if !db.Model(&CreditCard{}).Related(&User{}).RecordNotFound() {
+		t.Errorf("RecordNotFound for Related")
+	}
 }
 
 type Order struct {