Handle user creation upon registration.

ent/user/user.go

@@ -40,6 +40,10 @@ func ValidColumn(column string) bool {
 }
 
 var (
+	// UsernameValidator is a validator for the "username" field. It is called by the builders before save.
+	UsernameValidator func(string) error
+	// PasswordValidator is a validator for the "password" field. It is called by the builders before save.
+	PasswordValidator func(string) error
 	// DefaultCreatedAt holds the default value on creation for the "created_at" field.
 	DefaultCreatedAt func() time.Time
 )