[#6372] Fixed nullable constraint bug for columns during auto migration

migrator/migrator.go

@@ -525,7 +525,7 @@ func (m Migrator) MigrateColumn(value interface{}, field *schema.Field, columnTy
 	// check nullable
 	if nullable, ok := columnType.Nullable(); ok && nullable == field.NotNull {
 		// not primary key & database is nullable
-		if !field.PrimaryKey && nullable {
+		if !field.PrimaryKey && !nullable {
 			alterColumn = true
 		}
 	}