[Zope3-Users] Re: How to test for object metatype

[Cliff Ford]

Thanks for the help. I 'discovered' the isinstance method in the ZAPI 
Reference of your book, which is just what I needed. I put the filter 
method in the custom content class rather than a separate view class. It 
all seems to work so I am progressing again.

Cliff
Philipp von Weitershausen wrote:

Cliff Ford wrote:
I have a custom object that uses a page template to make a list of 
other objects in its containing folder. This so far lists security 
proxied object instances:

<p tal:repeat="item view/__parent__/__parent__/values" 
tal:content="item">
Testing
</p>

Uh, you should use   context/__parent__/values...
I want to filter the objects by metatype. That does not exist in Zope 
3 and I don't know how to use queryType or queryContentType in a page 
template. Is there something simple that I am missing?

You can't do this in a Page Template because you're not supposed to. 
Filtering involves logic, Page Templates are there to only render data 
structures into XML/XHTML.

So, what you'll want to do is write a complementary view class for your 
ZPT that gets zapi.getParent(context).values() and filters the elements 
in that list according to their content type or whatever you'll need.

 From your ZPT you can call that method through the 'view' variable (the 
one you used above not quite correctly).

Philipp
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