[Zope] getting the type of an object from within dtml ???

Mon, 26 Jun 2000 09:43:31 +0200

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Hello,

>> would you please elaborate.... what are you trying to determine the type
of?

Sorry for my lack of clarity.

I would like to get the class of the object, just using dtml. (and without
using external method)

Typically, the idea would be to define a dtml method (for instance getclass)
that return the class
of the object, so that I could write:

--- in a dtml-method defined for a Class A, and that can be called from
instance
of class A or subclasses of A.
...
<br>My class is :<dtml-var getclass>
...

>> Zope namespace ... eventually the namespace will be explained and
documented better.

I believe this is not a matter of documentation.
It is just that is is uselessly too complicate.

Note:
I very much like some of the ideas behind Zope. (such as the good
integration
of an OO database in the system, use of a dynamic language, etc.)
But I can really not get used to some of the other aspects that are very
well
addressed by other systems, but are so poorly addressed by Zope such as:
  * the namespace.
  * bad integration with python.
  * can not change the inheritance tree once a class has been created.
    (I have tried one of the trick that was posted somewhere, but it does
not work 100%).
  * very bad support for pointers (object1 --> object2).

Thierry

Thierry Nabeth
Research Fellow
INSEAD CALT (the Centre for Advanced Learning Technologies)
http://www.insead.fr/CALT/

-----Original Message-----
From: alan runyan [mailto:runyaga@thisbox.com]
Sent: Monday, June 26, 2000 5:36 AM
To: Thierry Nabeth; zope@zope.org
Subject: Re: [Zope] geting the type of an object from within dtml ???

> I have unsuccessifully been trying to figure out ou to get the type of an
> object
> from withing html.

are you talking about a ZOPE object? remember if you are a DTML Method your
'meta_type' will return the container object (it doenst have its own
namespace)

you could try
<dtml-with object>
  <dtml-var meta_type>
</dtml-with>

> Python is supposed to have a function type(object) that return the type,
> but I was not able to find a way to call it. (and I would rather prefere
not
> to have
> to define an external function.).

would you please elaborate.... what are you trying to determine the type of?

> My problem seems to have to do with the Zope namespace (which model I
> believe is
> a real pain in the ass :-(((().

I agree.  _[_['blah']] is probably the nastiest thing I've ever seen.  and
then someone will start adding lambdas to it and it will be all crap to
maintain from there... :(  eventually the namespace will be explained and
documented better, this is mainly a python/ZOPE framework idea that needs to
be experienced.  I still dont 100% get it.  I can usually make things work,
but sometimes I just dont quite 'get it'.

>
> Any suggestion, ideas ?

be abit more specific, you using python methods,. external methods, or
trying to do this from within DTML?

~runyaga

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<P><FONT SIZE=2>Hello,</FONT>
</P>

&gt;&gt; would you please elaborate.... what are you trying to determine the type of?

<P><FONT SIZE=2>Sorry for my lack of clarity.</FONT>
</P>

I would like to get the class of the object, just using dtml. (and without using external method)

<P><FONT SIZE=2>Typically, the idea would be to define a dtml method (for instance getclass) that return the class</FONT>
<BR><FONT SIZE=2>of the object, so that I could write:</FONT>
</P>

<P><FONT SIZE=2>--- in a dtml-method defined for a Class A, and that can be called from instance</FONT>
<BR><FONT SIZE=2>of class A or subclasses of A.</FONT>
<BR><FONT SIZE=2>...</FONT>
<BR><FONT SIZE=2>&lt;br&gt;My class is :&lt;dtml-var getclass&gt;</FONT>
<BR><FONT SIZE=2>...</FONT>
</P>
<BR>

&gt;&gt; Zope namespace ... eventually the namespace will be explained and
 documented better.

<P><FONT SIZE=2>I believe this is not a matter of documentation.</FONT>
<BR><FONT SIZE=2>It is just that is is uselessly too complicate.</FONT>
</P>

Note:
 I very much like some of the ideas behind Zope. (such as the good integration
 of an OO database in the system, use of a dynamic language, etc.)
 But I can really not get used to some of the other aspects that are very well
 addressed by other systems, but are so poorly addressed by Zope such as:
 &nbsp; * the namespace.
 &nbsp; * bad integration with python.
 &nbsp; * can not change the inheritance tree once a class has been created.
 &nbsp;&nbsp;&nbsp; (I have tried one of the trick that was posted somewhere, but it does not work 100%).
 &nbsp; * very bad support for pointers (object1 --&gt; object2).

<P><FONT SIZE=2>Thierry</FONT>
</P>

<P><FONT SIZE=2>Thierry Nabeth</FONT>
<BR><FONT SIZE=2>Research Fellow</FONT>
<BR><FONT SIZE=2>INSEAD CALT (the Centre for Advanced Learning Technologies)</FONT>
<BR><FONT SIZE=2><A HREF="http://www.insead.fr/CALT/" TARGET="_blank">http://www.insead.fr/CALT/</A></FONT>
</P>
<BR>

<P><FONT SIZE=2>-----Original Message-----</FONT>
<BR><FONT SIZE=2>From: alan runyan [<A HREF="mailto:runyaga@thisbox.com">mailto:runyaga@thisbox.com</A>]</FONT>
<BR><FONT SIZE=2>Sent: Monday, June 26, 2000 5:36 AM</FONT>
<BR><FONT SIZE=2>To: Thierry Nabeth; zope@zope.org</FONT>
<BR><FONT SIZE=2>Subject: Re: [Zope] geting the type of an object from within dtml ???</FONT>
</P>
<BR>

<P><FONT SIZE=2>&gt; I have unsuccessifully been trying to figure out ou to get the type of an</FONT>
<BR><FONT SIZE=2>&gt; object</FONT>
<BR><FONT SIZE=2>&gt; from withing html.</FONT>
</P>

are you talking about a ZOPE object? remember if you are a DTML Method your
 'meta_type' will return the container object (it doenst have its own
 namespace)

<P><FONT SIZE=2>you could try</FONT>
<BR><FONT SIZE=2>&lt;dtml-with object&gt;</FONT>
<BR><FONT SIZE=2>&nbsp; &lt;dtml-var meta_type&gt;</FONT>
<BR><FONT SIZE=2>&lt;/dtml-with&gt;</FONT>
</P>

&gt; Python is supposed to have a function type(object) that return the type,
 &gt; but I was not able to find a way to call it. (and I would rather prefere
 not
 &gt; to have
 &gt; to define an external function.).

would you please elaborate.... what are you trying to determine the type of?

<P><FONT SIZE=2>&gt; My problem seems to have to do with the Zope namespace (which model I</FONT>
<BR><FONT SIZE=2>&gt; believe is</FONT>
<BR><FONT SIZE=2>&gt; a real pain in the ass :-(((().</FONT>
</P>

I agree.&nbsp; _[_['blah']] is probably the nastiest thing I've ever seen.&nbsp; and
 then someone will start adding lambdas to it and it will be all crap to
 maintain from there... :(&nbsp; eventually the namespace will be explained and
 documented better, this is mainly a python/ZOPE framework idea that needs to
 be experienced.&nbsp; I still dont 100% get it.&nbsp; I can usually make things work,
 but sometimes I just dont quite 'get it'.

<P><FONT SIZE=2>&gt;</FONT>
<BR><FONT SIZE=2>&gt; Any suggestion, ideas ?</FONT>
</P>

be abit more specific, you using python methods,. external methods, or
 trying to do this from within DTML?

<P><FONT SIZE=2>~runyaga</FONT>
</P>

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