On 6 March 2013 10:21, Arndt Droullier <[email protected]> wrote: > I don't think you need to implement a new traverser you just need to > provide a > customized __getitem__ to be used by your users and handle all issues you > described there. > For example provide a decorator and introduce a NoRessource Exception and > to be used > instead of KeyError. >
Well, I want the users to write their own resources, and therefore (potentailly) implement their own __getitem__. > Though 'MultiTraverser' sounds like you already have replaced the default > traverser? > I was going to say here that I use `pyramid.traversal.traverse`, then I realised that I do not. My code currently suffers from the same problem. Because "KeyError" is the thing used to denote "no such resource", I can't tell the difference between a non-existing resource and a programmer error. I can't currently think of a way out of this, without changing pyramid's use of KeyError to indicate no such resource in general :(. I'm sure this is a sign of bad design on my part, but it does seem like KeyError to indicate no such resource is also slightly problematic in general. I'm a little surprised I'm the first to raise this. Does anyone out there agree with my point, or is this truly just unique to me? I guess in most cases people are a) familiar with pyramid and that they have to be careful not to accidentally raise KeyError, b) if they find themselves in a no-such-resource situation it's obvious, c) if they find themselves in a no-such-resource situation they know that they have to check for unexpected KeyErrors. Are a)+b)+c) reasonable expectations for all pyramid developers? -- You received this message because you are subscribed to the Google Groups "pylons-discuss" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. Visit this group at http://groups.google.com/group/pylons-discuss?hl=en. For more options, visit https://groups.google.com/groups/opt_out.
