AutoMigrate() should always migrate checks, even there is no relationship constranits.

migrator/migrator.go

@@ -135,6 +135,7 @@ func (m Migrator) AutoMigrate(values ...interface{}) error {
 							}
 						}
 					}
+				}
 
 				for _, chk := range stmt.Schema.ParseCheckConstraints() {
 					if !tx.Migrator().HasConstraint(value, chk.Name) {
@@ -143,7 +144,6 @@ func (m Migrator) AutoMigrate(values ...interface{}) error {
 						}
 					}
 				}
-				}
 
 				for _, idx := range stmt.Schema.ParseIndexes() {
 					if !tx.Migrator().HasIndex(value, idx.Name) {