Re: Data model traverse

Saturday, March 28, 2009, 12:48:36 AM, Daniel Dekany wrote:
> Friday, March 27, 2009, 5:44:46 PM, wkbutler wrote:
>>
>> Thanks Daniel.  Maybe data_model has been overridden then, because when I use
>> your suggestion this is the error I encounter:
>>
>> Caused by: freemarker.template.TemplateException: Expected extended hash.
>> .data_model evaluated instead to freemarker.co
>> re.Environment$1 on line 3, column 10 in
>> appfuse/web/struts/action-test.ftl.
>>         at
>> freemarker.core.TemplateObject.invalidTypeException(TemplateObject.java:135)
>>         at
>> freemarker.core.BuiltIn$keysBI._getAsTemplateModel(BuiltIn.java:594)
>>         at
>> freemarker.core.Expression.getAsTemplateModel(Expression.java:89)
>>         at freemarker.core.IteratorBlock.accept(IteratorBlock.java:87)
>>         at freemarker.core.Environment.visit(Environment.java:196)
>>         at freemarker.core.MixedContent.accept(MixedContent.java:92)
>>         at freemarker.core.Environment.visit(Environment.java:196)
>>         at freemarker.core.Environment.process(Environment.java:176)
>>         at freemarker.template.Template.process(Template.java:232)
>>         at
>> org.hibernate.tool.hbm2x.TemplateHelper.processTemplate(TemplateHelper.java:255)
>
> Now that's magical, in a bad way. What does ${.version} print? Because
> it seems I will have to find out what Envionment$1 is... (Currently
> it's a TemplateDirectiveBody, and I could achieve this error message
> with a trick, but the stack trace doesn't suggest that the error was
> achieved with my trick...) Can you access any data-model variables at
> all in this template? I guess you can't.

Anyway, a quick guess... I remember that in some older FM versions the
data-model wasn't TemplateHashModelEx. So maybe it's an old FM
version, and there Environment$1 was some anonymous TemplateHashModel
used to wrap the data-model... So, replace freemarker.jar with a
recent one, and if the problem goes away, then that was it.

>> But it's not clear to me in looking at the Template.process() call, if this
>> is really happening.  
>>
>> The process(java.lang.Object, java.io.Writer)  method is being given a
>> freemarker.template.SimpleHash, defined as 
>>         getContext().put("version", Version.getDefault());
>>         getContext().put("ctx", getContext());
>>         getContext().put("templates", new Templates());
>>         getContext().put("date", new SimpleDate(new Date(), 3));
>>
>> and I don't see anything else being done at the top level.
>
> And while you are that... exactly which Hibernate version is this?
>
>> I haven't figured out yet how the data model name gets set - what
>> should I look for?
>
> Nothing, the data-model has no name, as it's the top-level container
> itself. The .data_model thing should just work, but something is
> seriously screwed here...
>
>>
>>
>>
>> Daniel Dekany wrote:
>>> 
>>> Wednesday, March 25, 2009, 9:50:38 PM, wkbutler wrote:
>>>>
>>>> Hi -
>>>> I know this has been asked before, but I have not seen an answer that
>>>> seems
>>>> to work for me.  I am looking to discover the contents of the data model
>>>> during template processing time, just for the purpose of setting up a
>>>> debugging FTL template.
>>>>
>>>> Is there a constant keyword for the root of the model?  
>>>>
>>>> I have seen .data_model used but for me that was an Environment object
>>>> (and
>>> 
>>> You have overlooked something there; .data_model is the root of the
>>> data-model itself. It's not an Environment object (of course, unless
>>> someone uses the Environment object as the data-model parameter in
>>> Template.process... but that's at best unusual.)
>>> 
>>>> accessing .data_model.dataModel as I thought should have been
>>>> possible, according to the freemarker.core.Environment API, result
>>>> in an 'undefined' error).
>>>>
>>>> This thread asks the same question
>>>> http://www.nabble.com/traverse-the-data-tree-td6874906.html#a6874906
>>>>
>>>> and Attila mentions it's possible but unfortunately did not
>>>> elaborate. Using <#recurse> is apparently valid but for me resulted
>>>> in an error also.
>>> 
>>> #recurse only works for FTL node values, like wrapped XML-s. I doesn't
>>> work for plain hashes and like. You should use ?keys on them, like:
>>> 
>>> <p>The variables in the data-model are:
>>> <ul>
>>>   <#list .data_model?keys as key>
>>>     <li>${key?html}
>>>   </#list>
>>> </ul>
>>> 
>>>> Thanks for any advice!
>>> 
>>> -- 
>>> Best regards,
>>>  Daniel Dekany
>>> 
>>> 
>>> ------------------------------------------------------------------------------
>>> _______________________________________________
>>> FreeMarker-user mailing list
>>> [email protected]
>>> https://lists.sourceforge.net/lists/listinfo/freemarker-user
>>> 
>>> 
>>
>

-- 
Best regards,
 Daniel Dekany


------------------------------------------------------------------------------