Grails：UPDATE 函数是如何工作的？
我摆脱了原来的 UPDATE gsp Grails 优惠。
我将其放在 list.gsp 表的第一行中，并将表的所有值更改为 g:textfield，以便可以编辑它们，而无需转到 save.gsp
但现在我正在尝试使其工作，并且我不能。
我在每一行的最后一列添加了一个更新按钮。
当我更改 g:textfields 的值并单击更新按钮时，它告诉我
密度#ID已更新
，但值没有更改。
我认为我在控制器中的 def update 做错了。
这是代码：
def update = {
log.info "Entering Action ${actionUri}"
def densityInstance = Density.get(params.id)
if (densityInstance) {
if(params?.Rcommodity) {
println "${params.Rcommodity}"
}
if (params.version) {
def version = params.version.toLong()
if (densityInstance.version > version) {
densityInstance.errors.rejectValue("version", "default.optimistic.locking.failure", [message(code: 'density.label', default: 'Density')] as Object[], "Another user has updated this Density while you were editing")
render(view: "list", model: [densityInstance: densityInstance])
return
}
}
densityInstance.properties = params
if (!densityInstance.hasErrors() && densityInstance.save(flush: true)) {
flash.message = "${message(code: 'default.updated.message', args: [message(code: 'density.label', default: 'Density'), densityInstance.id])}"
redirect(action: "list", id: densityInstance.id)
}
else {
redirect(action: "list", id: densityInstance.id)
}
}
else {
flash.message = "${message(code: 'default.not.found.message', args: [message(code: 'density.label', default: 'Density'), params.id])}"
redirect(action: "list")
}
}
Rcommodity 是创建的文本字段的名称，我放置了一个 println 来查看该值是否正确，现在我不知道如何使文本字段的值成为输入的值，它给了我与之前的值相同，但它给了我消息说它已更新。 控制器是 DensityController，域是密度
任何帮助将不胜感激。谢谢：D
I got rid of the original UPDATE gsp Grails offers.
I put it in the first row of my list.gsp table and change all the values of the table to g:textfield so they can be edited without going to the save.gsp
But now I'm trying to make it work, and I can't.
I added a update button in the last column of the row, of every row.
When I change the values of the g:textfields and click the update button it tells me
Density #ID updated
but the values do not change.
I think I am doing something wrong with def update in the controller.
Here is the code:
def update = {
log.info "Entering Action ${actionUri}"
def densityInstance = Density.get(params.id)
if (densityInstance) {
if(params?.Rcommodity) {
println "${params.Rcommodity}"
}
if (params.version) {
def version = params.version.toLong()
if (densityInstance.version > version) {
densityInstance.errors.rejectValue("version", "default.optimistic.locking.failure", [message(code: 'density.label', default: 'Density')] as Object[], "Another user has updated this Density while you were editing")
render(view: "list", model: [densityInstance: densityInstance])
return
}
}
densityInstance.properties = params
if (!densityInstance.hasErrors() && densityInstance.save(flush: true)) {
flash.message = "${message(code: 'default.updated.message', args: [message(code: 'density.label', default: 'Density'), densityInstance.id])}"
redirect(action: "list", id: densityInstance.id)
}
else {
redirect(action: "list", id: densityInstance.id)
}
}
else {
flash.message = "${message(code: 'default.not.found.message', args: [message(code: 'density.label', default: 'Density'), params.id])}"
redirect(action: "list")
}
}
The Rcommodity is the name of the textfields created, I put a println to see if the value was right, now I don't know how to make the value of the textfield be the one entered, it gives me the same value it had before but it gives me the message saying that it was updated.
The controller is DensityController and the domain is density
Any help would be greatly appreciated. Thanks :D
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评论（1）
从打印的 flash 消息来看，好像实例正在更新（尽管“#ID”位看起来很奇怪 - 您是否替换了实际的 id？）。
它可能
实际上并不匹配任何实例属性，因此在保存之前实际上没有更改任何属性。您确定已将 gsp 输入字段命名为与密度类字段的名称相匹配吗？例如，Rcommodity 是 Density 的属性吗？
可能有助于添加 gsp 页面的表单位以及密度域类。
Looks from the flash message being printed as though the instance is being updated (though the "#ID" bit looks odd - have you replaced the actual id?).
It might be that
is not actually be matching any instance properties, so none are actually being changed before the save. Are you sure you've named your gsp input fields to match the names of your Density class fields? Is Rcommodity a property of Density, for example?
Might help to add the form bit of your gsp page, as well as the Density domain class.