[Zope] Re: Using PUT_factory for objects outside of ZODB

[Tres Seaver]

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John Barham wrote:
> I want to be able to intercept PUT requests to Zope to store objects
> outside of the ZODB by storing the body of the PUT request in an SQL
> database.  I've written a PUT_factory external method that calls the
> function PUT_ParameterFile defined below:
> 
> ==========
> 
> [...boilerplate Zope imports...]
> 
> class ParameterFile(Implicit):
>     security = ClassSecurityInfo()
>     security.declareObjectPublic()
>     security.setDefaultAccess("allow")
> 
>     def __init__(self, context, job_batch_id, body):
>         self.context = context
>         self.job_batch_id = job_batch_id
>         self.body = body
> 
>     def PUT(self, REQUEST, RESPONSE):
>         self.context.SQL_UpdateJobBatchParameterFile(
>                 job_batch_id=self.job_batch_id, parameter_file=self.body)
>         RESPONSE.setStatus(204)
>         return RESPONSE
> 
> def PUT_ParameterFile(self, name, typ, body):
>     if typ == "text/plain":
>         return ParameterFile(self, name, body)
> 
> =============
> 
> The ParameterFile.PUT method is being called, but then Zope returns w/
> the error "Can't pickle <extension class __builtin__.ParameterFile at
> 72918728>: attribute lookup __builtin__.ParameterFile failed".  Why is
> Zope trying to pickle the ParameterFile object when it's handling PUT
> itself?

The "PUT factory" has a contract that it return an object, which will
then be "seated" in its container, after which its PUT method will be
called.  If you don't want that behavior, then you need to use a custom
container which overrides PUT itself, rather than trying to use the one
in the 'webdav' package.


Tres.
- --
===================================================================
Tres Seaver          +1 202-558-7113          tseaver at palladion.com
Palladion Software   "Excellence by Design"    http://palladion.com
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