You want to look at the Struts 2 Preparable Interceptor, and how to configure
this for your action in the Struts.xml file.
Martin Homik wrote:
>
> Can anyone explain the mechanism of form pre-population. Since I am a
> newbie, my experience bases rather on a try-and-error approach. Related to
> my request is also my confusion about differences between generated code
> by appfuse:gen and the suggested approach in the online tutorial.
>
> I came across the problem when I implemented a simple Blog application. I
> had a POJO Class "Post" which comprises the fields title, body, created,
> and modified. The latter two fields are of type Date and they are not
> nullable. The Post JSP form shows only the title and body and allows both
> to edit. But when I edit an existing post that has a created/modfied
> timestamp and hit the save button, I get an exception coming from the
> database. For some reason, the timestamps got lost (set to null). Also, I
> do not understand why the action tests pass and the Canoo tests fail.
>
> I figured out that when I make both timestamps available to the JSP form
> as hidden information then everything is fine:
> <s:hidden name="post.created" value="%{post.created}"/>
> <s:hidden name="post.modified" value="%{post.modified}"/>
>
> I was not sure if this is the best solution so I have set up a new
> project, created the Post POJO class and run 'mvn appfuse:gen'.
> Surprisingly, the resulting PostAction class had a method 'prepare()'
> which is invoked when I open the Post list and form page. Then, I removed
> the date fields from the form and observed the changes in the database. In
> contrast to my original attempt the timestamps were still there. I assume,
> that the prepare() method is somehow in charge of this.
>
> So, I copied 'prepare()' to my original PostAction class in the other
> project which I implemented by following the tutorial. And guess what, the
> 'prepare()' method was not invoked. Why? What's the difference between
> the code in the online tutorial and the code generated by appfuse:gen? I
> was able to preserve the dates only when I added them to the form as
> hidden fields.
>
> Cheers,
> Martin
>
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