Forum OpenACS Development: Re: Re: xotcl object cache behavior?

I don't want to delay the active work you're doing on these packages -- and much appreciated work, too -- so maybe I should just delay my explorations until a later date.

Still, permit me a few more questions. I am having problems with your suggested test code. I have an xowiki instance with id 11385. Its root content_folder is id 11393, and the content_folder's ::xowiki::Object is id 11395 (and its name is ::11393). When I try what you suggest, here's what happens in the DS Shell:

set pkg_id 11385
set fldr_id 11393
set obj_id 11395
::xowiki::Package instantiate_page_from_id -item_id $obj_id
::Serializer deepSerialize ::$obj_id

returns this error:

ERROR:
Query did not return any rows.
    while executing
"db_1row get_class "select content_type as object_type from cr_items where item_id=$item_id""
    invoked from within
"ns_cache eval xotcl_object_type_cache  [expr {$item_id ? $item_id : $revision_id}] {
      if {$item_id} {
	db_1row get_class "select content_type as ..."
    (procedure "instantiate" line 4)
    ::Generic::CrItem->instantiate
    invoked from within
"::Generic::CrItem instantiate -item_id $item_id -revision_id $revision_id"
    (procedure "instantiate_page_from_id" line 4)
    ::xowiki::Package->instantiate_page_from_id
    invoked from within
"::xowiki::Package instantiate_page_from_id -item_id $obj_id"
    ("uplevel" body line 9)
    invoked from within
"uplevel 1 $script"

Thinking perhaps you meant to pass the folder -- not the folder object -- to ::xowiki::Package instantiate:

set pkg_id 11385
set fldr_id 11393
set obj_id 11395
::xowiki::Package instantiate_page_from_id -item_id $fldr_id
::Serializer deepSerialize ::$fldr_id

reveals that presumably that's not what you meant:

ERROR:
invalid command name "content_folder"
    while executing
"$object_type instantiate -item_id $item_id -revision_id $revision_id"
    (procedure "instantiate" line 13)
    ::Generic::CrItem->instantiate
    invoked from within
"::Generic::CrItem instantiate -item_id $item_id -revision_id $revision_id"
    (procedure "instantiate_page_from_id" line 4)
    ::xowiki::Package->instantiate_page_from_id
    invoked from within
"::xowiki::Package instantiate_page_from_id -item_id $fldr_id
"
    ("uplevel" body line 9)
    invoked from within
"uplevel 1 $script"

I see that ::xowiki::Package instantiate_page_from_id calls ::Generic::CrItem instantiate, sets the package_id and folder_id, and does some other stuff -- but doesn't appear to get database data in the way that "select * from xowiki_objectx where object_id = $object_id" would. Probably I'm still misunderstanding something basic here...

Anyway, thanks for any pointers. I'm trying to grok "The Xotcl Way" since I have several packages developed for OpenACS 3.x that am porting to 5.x and want to build with xotcl.

Thanks again for your helpful explanations and ingenious code!

assume, you have a folder 16059, you might have
a folder object with the id 16068 and the name ::16059
The next two commands do create the object and show it to
you (you can run this from the shell).

::xowiki::Package instantiate_page_from_id -item_id 16068
::Serializer deepSerialize ::16068

Is there somewhere in the api that returns the id "16068" in your example? In any case, I see how to work around this for now, and I realize that you're actively working on all this. I really appreciate all your ongoing contributions! You are amazingly productive!

By the way, is your book entitled "Using XOTCL with OpenACS"? That would be a most excellent title! 😊