I'm going to look into this, but what I ended up doing between posting this
question and now is editing api_views.py's APIDocumentMetadataView class
and change the 'put' function to:
def put(self, *args, **kwargs):
> """
> Edit the selected document metadata type and value.
> """
> try:
> partial = kwargs.pop('partial', False)
> instance = self.get_object()
> serializer = self.get_serializer(instance,
> data=self.request.data, partial=partial)
> serializer.is_valid(raise_exception=True)
> instance.user = self.request.user
> serializer.save()
> return Response(serializer.data)
> except Exception as exception:
> return Response(
> status=status.HTTP_400_BAD_REQUEST, data={
> 'non_fields_errors': unicode(exception)
> }
> )
>
This gave me a user variable available in class DocumentMetadata to use in
the save method:
> def save(self, *args, **kwargs):
> if self.metadata_type.pk not in
> self.document.document_type.metadata.values_list('metadata_type',
> flat=True):
> raise ValidationError(
> _('Metadata type is not valid for this document type.')
> )
>
> #compare metadata values; if different, log the change
>
> valueList = self.document.metadata.filter(id=self.id).values()
> if len(valueList) > 0:
> old_metadata_value = valueList[0]['value']
> if old_metadata_value != self.value:
> event_metadata_properties_edit.commit(
> actor=self.user,
> target=self._document_cache,
> description='Changed value from
> "'+str(old_metadata_value or '')+'" to "'+str(self.value or '')+'"',
> action_object=self._metadata_type_cache
> )
>
> return super(DocumentMetadata, self).save(*args, **kwargs)
>
This is what I've used internally for my implementation.
I'm still getting up to speed on the whole 'django-mvc-layers-on-layers'
thing; This is my first project using python in a web environment, using
classes in python, and very near to my first time implementing classes
myself... so forgive me if things aren't 'good enough' or 'pythonic enough'
code wise.
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