Hi Christopher,

On 9 June 2014 16:29, Christopher Lozinski <lozinski@freerecruiting.com> wrote:

Here is an extract from the principalannotation configure.zcml file.

<adapter factory=".utility.annotations" />

<adapter
for="zope.security.interfaces.IPrincipal *"
factory=".utility.annotations"
/>

Clearly something is wrong. Two copies, and no "provides" line.

The <adapter /> element only needs the `for` and `provides` attributes if you want to give different values than the ones already declared on the factory, or if the factory doesn't have them. In the case of `.utility.annotations` those are, respectively:

* zope.security.interfaces.IPrincipal

* zope.annotation.interfaces.IAnnotations

As can be seen here:

https://github.com/zopefoundation/zope.principalannotation/blob/master/src/zope/principalannotation/utility.py#L122-L126

The second <adapter /> element creates a multi-adapter from (IPrincipal, Interface) to IAnnotations.

So I tried fixing it.

<adapter
factory=".utility.annotations"
provides="zope.annotation.interfaces.IAnnotations"
for="zope.principalregistry.principalregistry.Principal"
/>

No luck. I still get the following error report. Cannot adapt.

File "/root/.buildout/eggs/zope.app.container-3.9.2-py2.7.egg/zope/app/container/browser/contents.py", line 462, in getPrincipalClipboard
annotations = IAnnotations(user)
TypeError: ('Could not adapt', <zope.principalregistry.principalregistry.Principal object at 0x80bae03d0>, <InterfaceClass zope.annotation.interfaces.IAnnotations>)

I am running the most recent release of grok, to which I added

zope.principalannotation.

I am trying to adapt the user object.
(Pdb) user
<zope.principalregistry.principalregistry.Principal object at 0x80bae03d0>

Here is what I have tried so far.

Maybe I am not installing it correctly. So I inserted a typo in the principalannotation configuration file, and sure enough I got an error report

So let me see if the adapter is loaded.

(Pdb) from zope.component import getGlobalSiteManager
(Pdb) gsm = getGlobalSiteManager()
(Pdb) gsm.adapters._adapters

A long list is returned, but searching on
zope.annotation.interfaces.IAnnotations
gives me

<implementedBy zope.principalregistry.principalregistry.Principal>: {<InterfaceClass zope.annotation.interfaces.IAnnotations\
>: {u'': <function annotations at 0x80b983230>}},

Okay, so it is in the list of adapters, but getAdapter seems to have a problem.

(Pdb) from zope.component import getAdapter
(Pdb) from zope.annotation.interfaces import IAnnotations

(Pdb) getAdapter(user,IAnnotations)
*** ComponentLookupError: (<zope.principalregistry.principalregistry.Principal object at 0x80bae03d0>, <InterfaceClass zope.annotation.interfaces.IAnnotations>, u'')

In the code I linked above, the adapter factory tries to look up a `IPrincipalAnnotationUtility` (while ignoring the context parameter, which is bad form, but likely not the cause of your troubles).

Maybe you're getting the adaptation error because you don't have an `IPrincipalAnnotationUtilty` utility?

For those interested in the context, I am trying to put up a Zope 2 style ZMI on top of grok. For the cut copy paste interface, it needs to store the objects somewhere, presumably on the principal, but since principals are transient objects, the principal annotation package stores the data persistently.

I am not sure what to try next. Any advice would be most appreciated.

For this immediate problem, perhaps you need to register an `IPrincipalAnnotationUtility`. The file I linked above contains a persistent implementation, suitable registration on a local site manager. "persistent" means it won't be there by default until you actually register it.

For the more generic problem of a Zope2 like management interface on top of ZODB storage containing a copy+paste implementation, done on modern libraries (including a zca registry), you could try SubstanceD:

http://substanced.readthedocs.org/

Cheers,

Leo

Christopher Lozinski

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