Re: Multi-row update with nested beans (Lab AA spoiler)

Doug Shackelford wrote:
> While doing Lab3 AA (dot notation), I had some problems getting
> multi-row update to work on the taskListMR page after I nested the tasks
> inside a project.  I only have one question at the end, but I thought I
> would post my journey in case it would be helpful to other students.
> 
> Note: this post is a spoiler, so if you haven't done Lab AA, then I
> wouldn't read it.  By the way, I highly recommend this lab.  It forced
> me to a much greater understanding of what is going on.
> 
> After Lab 2, my MRTaskList.jsp looked something like this.  The formBean
> (fb) was a TaskBean.
> 
> 	<c:forEach var="row" items="${fb}">
> 	<tr>
> 		<td>
> 			<c:url value="taskEdit" var ="url">
> 				<c:param name="ID" value="${row.id}"/>
>             		<c:param name="Dispatch" value="Edit"/>
> 			</c:url>
> 			<a href ='<c:out value="${url}"/>' > 
> 				<fmt:message key="button.edit"
> bundle="${loc}"/>
> 			</a>
> 		</td>
> 		<td>
> 			<html:text styleClass="form" property="name"
> size="20" name="row" indexed="true"/>
> 		</td>
> 	</tr>
> 	</c:forEach>
> 
> After nesting, the formBean (fb) became a ProjectBean with tasks.
> Accordingly, I changed the <c:forEach> to be:
> 
> 	<c:forEach var="row" items="${fb.tasks.displayList}">
> 
> This, of course, didn't work, so I changed the var to "tasks".  This
> gave me this:
> 
> 	<c:forEach var="tasks" items="${fb.tasks.displayList}">
> 	<tr>
> 		<td>
> 			<c:url value="taskEdit" var ="url">
> 				<c:param name="ID" value="${tasks.id}"/>
>             		<c:param name="Dispatch" value="Edit"/>
> etc.
> 
> This didn't work either, so I changed it to
>  
> 	<c:forEach var="tasks.row" items="${fb.tasks.displayList}">
> 
> At first, I didn't understand why this helped.  Now, I do.  This really
> helped me to understand.

Above should work!
Is it easy for you to send me the sample code?
.V
>  
> Unfortunately, I still had a problem with my "Edit" URL.  It wasn't
> populating the ID.  Everything else worked.  I tried many variations
> such as:
> 
> 	<c:param name="ID" value="${tasks.row.id}"/>
> 
> I guess this doesn't work because "tasks.row" is not a valid variable
> name.  
> 
> Eventually, I got it working by using <bean:write>, as follows:
> 
> 	<c:param name="ID">
> 		<bean:write name="tasks.row" property="id"/>
> 	</c:param>
> 
> Given that we should avoid the bean tags in favor of JSTL, is there any
> way to do this without using <bean:write>?
> 
> Thanks for any thoughts.
> 
> --Doug
>