Question

将实例保存在grails中有哪些指导原则？

我正在做这样的事情：

def colorInstance = Color.findOrSaveByName(colorname)
if (colorInstance.startsWith("R")) {
   colorInstance.isRColor = true;
}

我是否应该在if块中调用colorInstance.save()？为什么？

Answer 1

只要您的流程需要，您就可以显式保存实例（就像您的示例一样）。

考虑at the end of a request cycle, when a GORM session is flushed, a dirty check operation is performed. Objects that are binded to the session are compared against their original values and if changes are detected, they are persisted。

从http://www.redwindsw.com/blog/2014-01-15-moving-from-rails-to-grails-differences-and-similarities开始，阅读有关 Hibernate会话的段落。

Answer 2

grails 2.3.4 colorInstance .save flush:true

in grails 2.2.2 colorInstance.save(flush:true)

何时以grails保存实例？

2 个答案: