Thanks, you've added a new room to my brain :)  Possibly that point should
be made in The Book since the discussion of Pluggable Brains comes at the
end of the chapter.


On Fri, 24 Nov 2000, Dieter Maurer wrote:

> Chris Gray writes:
>  > The Zope book discusses calling a ZSQL Method via a URL, saying that a
>  > request for a URL like:
>  > 
>  >   http://localhost:8080/zsql_method/parameter/value
>  > 
>  > "will return a result object", but what I get is the index_html document
>  > at the root, although I do get a rendered record with:
> The ZPublisher works as follows:
>   It traverses the ZODB guided by the components in your URL.
>   It it arrives at the URL's end, it checks whether the
>   reached object is callable (this is the case for all
>   kinds of methods and documents). If it is, the object
>   is called.
>   If it is not, ZPublisher checks, whether the object
>   has (or can acquire) a method "index_html"
>   (this usually is the case). It then calls this method.
> In your case:
>   ZPublisher will reach the result object (as the Zope book
>   describes). Unless you have wrapped this object
>   into a custom class (aka brain, see "Advanced" tab),
>   this is a "Record" object.
>   A "Record" object is not callable.
>   "index_html" is looked for, found in a folder above and
>   rendered.
>   That's what you see.
> What can you do?
>   Wrap you results into a custom brain that either
>   defines a "__call__" (that would need to be a
>   Python defined class) or an "index_html" (this
>   may be a non-persistent ZClass).
> Dieter

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