Re: [Zope] Fun with Trees

[Charlie Wilkinson]

On Mon, Jul 03, 2000 at 10:38:27PM +0200, Dieter Maurer waxed eloquent:
> Charlie Wilkinson writes:
>  > On Mon, Jul 03, 2000 at 09:35:06AM +0200, Rik Hoekstra waxed eloquent:
>  > > 
>  > > Charlie Wilkinson writes:
>  > [...] 
>  > > I'm trying to use dtml-tree to create a selective menu of objects based
>  > > on whether or not the object has an "add_to_menu" property.
>  > [...]
>  > > [rh]
>  > > Try (yes, this is tested):
>  > > 
>  > >  
>  > >  
>  > > 
>  > >  
>  > >  
>  > > 
>  > > 
>  > The bigger problem seems to be the namespace issue that Dieter was
>  > speaking of.
> 
> I found a solution that is much easier than hacking the
> TreeDisplay code:
> 
>   You do not plan to use REQUEST for information about the
>   request but only as a container for a temporary list.
>   This can be achieved without REQUEST
> 
>   
> 
>   
>  
>   
> 
> 
>   

Lots of good ideas, thanks guys!  However, I'm still getting an attribute
error on __getitem__.  I'm trying to figure out how namespaces get passed
around in Python to see if there's an easy way to fix this.

I've also found a workaround and pondered another:

- pass ['Folder','DTML Document'] to optionValues the normal way, i.e.:



  

  

  


...and then simply use DTML Documents and *only* DTML Documents for
stuff I want in the tree menu, primarily CGI forms, some of which might
be dynamically generated.  I guess if I smack into any limitations with
DMTL Documents, I'll have a Document call a method.  It's not ideal, but
it seems workable enough.

The other alternative might be to use ZCatalog with the Tree tag somehow.
I think it might do what I need, but I haven't given it much thought.

That said, I still think the idea you and Rik have been helping me
with is the most "elegant", but I've got a big site to build and very
little time.  Would it be any easier if instead of a DTML Method I used
an ExternalMethod as a wrapper/filter around objectValues?

It's very frustrating, as I keep thinking there's *got* to be an easy
way to fix this if I only had a half a Zope/Python clue.  I'm already
reading about as fast as I can!

Regards,
Charlie

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Re: [Zope] Fun with Trees

[Dieter Maurer]

Charlie Wilkinson writes:
 > On Mon, Jul 03, 2000 at 09:35:06AM +0200, Rik Hoekstra waxed eloquent:
 > > 
 > > Charlie Wilkinson writes:
 > [...] 
 > > I'm trying to use dtml-tree to create a selective menu of objects based
 > > on whether or not the object has an "add_to_menu" property.
 > [...]
 > > [rh]
 > > Try (yes, this is tested):
 > > 
 > >  
 > >  
 > > 
 > >  
 > >  
 > > 
 > > 
 > The bigger problem seems to be the namespace issue that Dieter was
 > speaking of.

I found a solution that is much easier than hacking the
TreeDisplay code:

  You do not plan to use REQUEST for information about the
  request but only as a container for a temporary list.
  This can be achieved without REQUEST


  

   

  
  




Dieter

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Re: [Zope] Fun with Trees

[Dieter Maurer]

Charlie Wilkinson writes:
 > On Mon, Jul 03, 2000 at 09:35:06AM +0200, Rik Hoekstra waxed eloquent:
 > > 
 > > Charlie Wilkinson writes:
 > [...] 
 > > I'm trying to use dtml-tree to create a selective menu of objects based
 > > on whether or not the object has an "add_to_menu" property.
 > [...]
 > > [rh]
 > > - if you append sequence-item it will include your whole method, which
 > > presumably is not what you want in your tree. Use id.
 > 
 > Not sure.  Supposedly objectValues() returns "actual objects", and
 > I assumed that using sequence-item would be something closer to that.
 >   The finer points of python are still lost on me, but I'm working
 > on it.
You are both right.

In principle, you can use "sequence-item" and get the object.
Later, when you use it, you can select whatever you need.

However, you used:
 

The "_[...]" calls "...", if this is callable.
Thus, "_['sequence-item']" first returns the object and then
calls it, if this is possible. In case of a DTML method, the
result would be the rendered body of the method.

You can use "_.getitem('sequence-item')" to get the object itself
and not the result of calling it.



Dieter

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Re: [Zope] Fun with Trees

[Rik Hoekstra]

> Not sure.  Supposedly objectValues() returns "actual objects", and
> I assumed that using sequence-item would be something closer to that.
>   The finer points of python are still lost on me, but I'm working
> on it.

Hm, you're right of course.

> 
> The bigger problem seems to be the namespace issue that Dieter was
> speaking of.  When I tried your code, I got Attribute errors on
> __getitem__.  It appears that Tree does not inherit the usual DMTL
> namespace.  I've been looking at Tree trying to figure out how to add
> it back in or somehow sneak my namespace into it, wondering what I'll
> break in the process.  (But that's what makes Zope so interesting! 8-)

Yeah tree does some things. What does your tree-code like? 

Rik

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Re: [Zope] Fun with Trees

[Charlie Wilkinson]

On Mon, Jul 03, 2000 at 09:35:06AM +0200, Rik Hoekstra waxed eloquent:
> 
> Charlie Wilkinson writes:
[...] 
> I'm trying to use dtml-tree to create a selective menu of objects based
> on whether or not the object has an "add_to_menu" property.
[...]
> [rh]
> Try (yes, this is tested):
> 
>  
>  
> 
>  
>  
> 
> 
> Two notes:
> - the string approach is an unnecessary hack. I changed it to standard
> Python list idiom

It sure looks a lot cleaner, thanks Rik.

> - if you append sequence-item it will include your whole method, which
> presumably is not what you want in your tree. Use id.

Not sure.  Supposedly objectValues() returns "actual objects", and
I assumed that using sequence-item would be something closer to that.
  The finer points of python are still lost on me, but I'm working
on it.

The bigger problem seems to be the namespace issue that Dieter was
speaking of.  When I tried your code, I got Attribute errors on
__getitem__.  It appears that Tree does not inherit the usual DMTL
namespace.  I've been looking at Tree trying to figure out how to add
it back in or somehow sneak my namespace into it, wondering what I'll
break in the process.  (But that's what makes Zope so interesting! 8-)

-cw-

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Re: [Zope] Fun with Trees

[Rik Hoekstra]

Charlie Wilkinson writes:

After RTFMing and flailing at DTML all night, I'm about stumped.
No pun intended.

I'm trying to use dtml-tree to create a selective menu of objects based
on whether or not the object has an "add_to_menu" property.  I've pretty
much figured out that I need a wrapper around objectValues that will
filter out the objects that don't have the "add_to_menu" property.
This wrapper would be called with dtml-tree's "branches" attribute.
I'm trying to do this wrapper in a DTML method and I've gotten all the
way to where I have to return a list of "actual objects", so says the
DTML Quick Reference.

Is there someone who could 'splain to me how to build a list of objects
in DTMLese?

Here's what I have so far (obviously not working):




  





[rh]
Try (yes, this is tested):

 
 

 
 


Two notes:
- the string approach is an unnecessary hack. I changed it to standard
Python list idiom
- if you append sequence-item it will include your whole method, which
presumably is not what you want in your tree. Use id.


HTH

Rik

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Re: [Zope] Fun with Trees

[Dieter Maurer]

Charlie Wilkinson writes:
 > I'm trying to use dtml-tree to create a selective menu of objects based
 > on whether or not the object has an "add_to_menu" property.  I've pretty
 > much figured out that I need a wrapper around objectValues that will
 > filter out the objects that don't have the "add_to_menu" property.
 > This wrapper would be called with dtml-tree's "branches" attribute.
 > I'm trying to do this wrapper in a DTML method and I've gotten all the
 > way to where I have to return a list of "actual objects", so says the
 > DTML Quick Reference.
 > 
 > Is there someone who could 'splain to me how to build a list of objects
 > in DTMLese?
 > 
 > Here's what I have so far (obviously not working):
 > 
 > 
 > 
 > 
 >   
 > 
 > 
 > 
That's perfect.

Almost surely, your problem results from the fact
that "dtml-tree" does not expect "branches" to be
a DTML method and does not pass a namespace to it.

I do not know, how you can avoid this (other than
changing the "dtml-tree" code.



Dieter

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[Zope] Fun with Trees

[Charlie Wilkinson]

(I always wanted to be a lumberjack! :)

After RTFMing and flailing at DTML all night, I'm about stumped.
No pun intended.

I'm trying to use dtml-tree to create a selective menu of objects based
on whether or not the object has an "add_to_menu" property.  I've pretty
much figured out that I need a wrapper around objectValues that will
filter out the objects that don't have the "add_to_menu" property.
This wrapper would be called with dtml-tree's "branches" attribute.
I'm trying to do this wrapper in a DTML method and I've gotten all the
way to where I have to return a list of "actual objects", so says the
DTML Quick Reference.

Is there someone who could 'splain to me how to build a list of objects
in DTMLese?

Here's what I have so far (obviously not working):




  




Right off the bat, Zope is giving me attribute errors about REQUEST,
but I'm not sure how else to do a set(), other than with REQUEST or
RESPONSE in front of it.

When I ran it stand-alone, I was *not* getting attribute errors and *was*
getting output that looked remotely like the guts of the desired objects.

Spare clues anyone?

TIA,
Charlie

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