Testing for a provided interface from within a page template

[J-C Brand]

Hi Devs,

I'm adding a custom CMF Action for my subtype enhanced archetype.

In the actions.xml there is a property "available_expr" in which I can
specify a guard condition for when to show this action.

This expression will render inside a page template, so it can either be
a tales expression, or a python expression restricted to the page
template environment.

So, the question is, how can I test that an object is subtyped, or that
an object provides a certain interface from within a page template?

Thanks!
J-C

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[Hedley Roos]

> So, the question is, how can I test that an object is subtyped, or that
> an object provides a certain interface from within a page template?

portal_catalog has a Keyword Index object_provides which you can query
from a page template. A subclass automatically inherits a super class's
interfaces.

Hedley

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[Mikko Ohtamaa]

J-C Brand wrote:

In the actions.xml there is a property "available_expr" in which I can
specify a guard condition for when to show this action.

This expression will render inside a page template, so it can either be
a tales expression, or a python expression restricted to the page
template environment.

So, the question is, how can I test that an object is subtyped, or that
an object provides a certain interface from within a page template?

I suggest you create a BrowserView which does the complex expression code in Python.

Please see http://plonemanual.twinapex.fi/content/expressions.html "Custom expression code"

--
Mikko Ohtamaa
http://www.twinapex.com - Python professionals for hire

[J-C Brand]

Mikko Ohtamaa wrote:

>
> J-C Brand wrote:
>  
>> In the actions.xml there is a property "available_expr" in which I can
>> specify a guard condition for when to show this action.
>>
>> This expression will render inside a page template, so it can either be
>> a tales expression, or a python expression restricted to the page
>> template environment.
>>
>> So, the question is, how can I test that an object is subtyped, or that
>> an object provides a certain interface from within a page template?
>>
>>    
>
> I suggest you create a BrowserView which does the complex expression code in
> Python.
>
> Please see http://plonemanual.twinapex.fi/content/expressions.html "Custom
> expression code"
>  

Thanks, worked like a charm.

By the way, great job on the developers manual!



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