[Zope-dev] Re: Acquisition by context first
Steve Alexander wrote: > > Of course, you can simplify it to: > > # acquire the object of name "attr" by context alone > def aquire_by_context(self, attr): > ob = self > while hasattr(ob, 'aq_base'): > if hasattr(ob.aq_base, attr): > return self.restrictedTraverse( > getattr(ob.aq_base, attr).getPhysicalPath()) > ob = ob.aq_parent > > # not found > raise KeyError, attr I should point out that this is just for finding an object by context alone. The context-only acquisition meme doesn't get passed on to anything that the returned object might in turn call. This makes this external method less useful than having a fancy acquisition context that checks for security by containment whilst getting attributes by context. However, such a fancy acquisition context would be much more complex to design. -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
[Zope-dev] Re: Acquisition by context first
Steve Alexander wrote: > > Here's an external method that ought to work. Well, it works for me: > > # acquire the object of name "attr" by context alone > def aquire_by_context(self, attr): > ob = self > while hasattr(ob, 'aq_base'): > aq_b=getattr(ob, 'aq_base', ob) > if hasattr(aq_b, attr): > attr_obj = getattr(aq_b, attr) > break; > ob = ob.aq_parent > else: > # not found > raise KeyError, attr > return self.restrictedTraverse(attr_obj.getPhysicalPath()) I'd left some cruft in there from debugging. Of course, you can simplify it to: # acquire the object of name "attr" by context alone def aquire_by_context(self, attr): ob = self while hasattr(ob, 'aq_base'): if hasattr(ob.aq_base, attr): return self.restrictedTraverse( getattr(ob.aq_base, attr).getPhysicalPath()) ob = ob.aq_parent # not found raise KeyError, attr -- Steve Alexander Software Engineer Cat-Box limited http://www.cat-box.net ___ Zope-Dev maillist - [EMAIL PROTECTED] http://lists.zope.org/mailman/listinfo/zope-dev ** No cross posts or HTML encoding! ** (Related lists - http://lists.zope.org/mailman/listinfo/zope-announce http://lists.zope.org/mailman/listinfo/zope )
