如何在Grails GSP中保存复合字段值？ [英] How do I save a composite field value in Grails GSP?

问题描述

  class Person 
 {
 static embedded = ['forSale'] 
布尔isSelling 
 House forSale 
} 
 
类别房屋
 {
整数房间
} 
  

我有一个numBedrooms的选择控件，如下所示：

 < tr class =prop> 
< td valign =topclass =name> 
< label for =numBedrooms>< g：message code =person.numBedrooms.labeldefault =Num Bedrooms/>< / label> 
< / td> 
< td valign =topclass =value $ {hasErrors（bean：personInstance，field：'forSale.numBedrooms'，'errors'）}> 
  noSelection =$ {['null'：'选择一个号码...']}
 from =$ {1..6}
 /> 
< / td> 
< / tr> 
  

请注意，我在select的fieldValue中使用了forSale.numBedrooms。我一直无法生成脚手架代码来查看它应该如何完成，因为由create-views生成的创建视图不包含forSale House对象中的字段的引用。

我还没有能够通过GSP访问任何复合字段的检查，所以这是一个猜测。在任何情况下，GSP页面都可以正确呈现，尽管这可能是因为我无法保存任何数据。

我将numBedrooms的值作为的URl查询字符串...

& numBedrooms = 2

当我这样做时，保存代码在我的控制器中默默无闻 - 至少没有任何东西会写入数据库。我已经打开几乎所有的调试日志记录，但我没有在日志中发现任何错误消息，尽管显然是有的。

如果我删除numBedrooms参数从查询字符串，然后我的保存进行正常，所以我猜测这是解决numBedrooms。

任何线索我做错了什么，我可以是否追查我的问题？

解决方案

我所做的是 generate-all 为 House 域复制并粘贴GSP代码，并在完成后删除文件。我还发现，在我使用 House 域名的情况下，创建模板来编辑 House 域名更为明智

对于你的GSP你需要类似的东西（注意name属性）

 < tr class =prop> 
< td valign =topclass =name> 
< label for =forSale.numBedrooms>< g：message code =house.numBedrooms.labeldefault =Num Bedrooms/>< / label> 
< / td> 
< td valign =topclass =value $ {hasErrors（bean：personInstance.forSale，field：'numBedrooms'，'errors'）}> 
  noSelection =$ {['null' ：'选择一个号码...']}
 from =$ {1..6}
 /> 
< / td> 
< / tr> 
  

在你的参数字符串中，你需要 * forSale * .numBedrooms = 2 。这段代码可以和 person.properties = params 或 new Person（params）一起使用。嵌入式指令仅告诉Hibernate将参数包含在同一个表中，但它们仍然是单独的Domain类。它可能会为域生成一个表，即使你永远不会使用它。

希望这有助于。

I have a composite domain object as follows:

class Person 
{
    static embedded = ['forSale']
    Boolean isSelling
    House forSale
}

class House 
{
    Integer numBedrooms
}

I have a select control for the numBedrooms as follows:

<tr class="prop">
 <td valign="top" class="name">
   <label for="numBedrooms"><g:message code="person.numBedrooms.label" default="Num Bedrooms" /></label>
 </td>
 <td valign="top" class="value ${hasErrors(bean: personInstance, field: 'forSale.numBedrooms', 'errors')}">
     <g:select name="numBedrooms" value="${fieldValue(bean: personInstance, field: 'forSale.numBedrooms')}" 
          noSelection="${['null':'Select a number...']}"
      from="${1..6}"
     />
 </td>
</tr>

Notice that I am using forSale.numBedrooms in the fieldValue on the select. I haven't been able to produce scaffolded code for this to take a look at how it is supposed to be done because the create view which gets generated by create-views contains no references to the fields in the forSale House object.

I also haven't been able to turn up any exampes of composite fields being accessed via GSP, so this is a bit of a guess. In any case the GSP page renders without errors, although that may be because I haven't been able to save any data.

I send the value of numBedrooms back as part of a URl query string...

&numBedrooms=2

When I do this the save code in my controller is failing silently - at least nothing ever gets written to the database. I have switched on debug logging for pretty much everything but I get no messages in the log which suggest anything is wrong, although something obviously is.

If I remove the numBedrooms parameter from the query string then my save proceeds as normal, so I am guessing it is something to do with resolving numBedrooms.

Any clue what I am doing wrong and what I can do to track down my problem?

解决方案

What I do is generate-all for the House Domain then copy and paste the GSP code and remove the files once I am done. I have also found it smarter to create templates to edit the House domain in the case where I am using the House domain later on.

For you GSP you need something like this (Notice the name attribute)

<tr class="prop">
 <td valign="top" class="name">
   <label for="forSale.numBedrooms"><g:message code="house.numBedrooms.label" default="Num Bedrooms" /></label>
 </td>
 <td valign="top" class="value ${hasErrors(bean: personInstance.forSale, field: 'numBedrooms', 'errors')}">
     <g:select name="forSale.numBedrooms" value="${fieldValue(bean: personInstance.forSale, field: 'numBedrooms')}" 
          noSelection="${['null':'Select a number...']}"
      from="${1..6}"
     />
 </td>
</tr>

In your param string you need *forSale*.numBedrooms=2. this code will work with person.properties = params or new Person(params).

The embedded "instruction" only tells Hibernate to include the parameters in the same table they are still seperate Domain classes. It will probably generate a table for the domain even though you may never use it.

Hope this helps.

这篇关于如何在Grails GSP中保存复合字段值？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！