[Zope] Problem with calling methods

[Oliver Bleutgen]

Nikel, Ernst-Dieter wrote:
> Hi everyone,
> 
> I have the following problem:
> 
> For example consider the code:
> 
> <dtml-in "test.ba.objectValues()">
>   <dtml-var id>
> </dtml-in>
> 
> This gives the ids in the folder test/ba.
> 
> My problem is that in my applcation I get the path like "test/ba" in the
> example through a REQUEST. The script 
> 
> <dtml-in "_[tt].ba.objectValues()">
>   <dtml-var id>
> </dtml-in>
> 
> works if the variable "tt" contains the value "test". But I don't have found
> a possibility to call the method if the given path (or better the relevant
> part of the path) contains more than one folder.
> 
> The code   
> 
> <dtml-in "_[tt].objectValues()">
>   <dtml-var id>
> </dtml-in>
> 
> don't works if the variable "tt" contains "test.ba".

Take a look at restrictedTraverse() (search the online help).
Three other remarks:

- It's in general not a good idea to trust anything coming from the 
client (the REQUEST) like you do. If you are using restrictedTravere for 
instance, your code will possibly reveal contents of folders which you 
don't want revealed if the user sends the right value for tt.

- If you just need the ids of your objects, better use objectIds instead 
of objectValues, the former is much faster.

- If you need to use objectValues, don't use id to get the Ids of these 
objects, use getId(), because not every object implements  the id 
attribute in the same way.


cheers,
oliuver