[drupal-devel] [feature] Taxonomy rewrite

chx drupal-devel at drupal.org
Sun Aug 21 13:56:49 UTC 2005

Issue status update for 
Post a follow up: 

 Project:      Drupal
 Version:      cvs
 Component:    taxonomy.module
 Category:     feature requests
-Priority:     normal
+Priority:     critical
 Assigned to:  chx
 Reported by:  chx
 Updated by:   chx
 Status:       patch (ready to be committed)

I asked moshe aboutwhat's a 'critical feature request' and he says: "i
guess if it a feature that many people want or that will enable
developers to build many features that people want". To quote a
well-respected developer "From what I have seen, a taxonomy-based
permission scheme is more popular than one using node types" in
http://lists.drupal.org/archives/drupal-devel/2005-04/msg00490.html so
I think the second half of the above sentence is in effect.


Previous comments:

Sun, 30 Jan 2005 23:19:27 +0000 : chx

Attachment: http://drupal.org/files/issues/taxonomy_db_rewrite.patch (6.71 KB)

I'd like to present a use for db_rewrite_sql: taxonomy rewrites. If this
goes through, it will be possible to create an access mechanism,
languages and whatever for taxonomy.

This is a very small change, I think, much smaller than the
node_rewrite_sql megpatch was 'cos at the moment nothing changes. There
are no DISTINCTs deleted. But this opens a door for future things.

Also, this only affects taxonomy.module, 'cos no other module deals
with term_data and vocabulary tables (well, forum.module does, but
those queries does not need a rewrite).


Mon, 31 Jan 2005 02:41:46 +0000 : moshe weitzman

please, let's identify some use cases before we run more queries through
the regex and hooks implied by db_qeury_sql. There might be a good
reason to do this, but you have to convince us.


Mon, 31 Jan 2005 06:49:02 +0000 : chx

In my latest version of db_rewrite_sql, which Dries has not yet
commited, regexs are not executed if not necessary. That version was
created well before Moshe's post, and I'm pretty sure it will pass,
'cos it is not a feature but a bugfix patch actually.

Until there are no implementations of hook_db_rewrite_sql which cares
for primary_field=='vid' or 'tid' , the performance hit is minimal, no


Mon, 31 Jan 2005 13:22:47 +0000 : Jose A Reyero

Use cases:

- Permissions for taxonomy terms/vocabs,  some tables and conditions
must be joined for taxonomy queries
- Multilanguage pages/taxonomy (i18n), additional conditions needed
also for taxonomy


Tue, 01 Feb 2005 08:09:25 +0000 : robertDouglass

+1 for being able to put user/role based permissions on vocabularies. I
see this as extremely important (can we do menus too?)


Tue, 01 Feb 2005 10:07:16 +0000 : chx

Yes, we can do menus [1] too. Good idea.
[1] http://drupal.org/node/16542


Tue, 01 Mar 2005 09:08:30 +0000 : tangent

This patch has no effect on term/node access.

1. All roles have been given the "access content" permission.
2. I have removed the "all" grant from the node_access table.
3. I have the "Categories" block visible and it is showing the terms
and number of nodes which are created.
4. Browsing as an anonymous user I can see the same terms and node
count in the categories block that I see as admin.
5. Clicking on a term (/taxonomy/term/2) shows all nodes (and their
content) associated with that term. For example, an image node is
displayed as a thumbnail and a page node is displayed with the teaser.
6. Clicking on the node title (/node/2) displays a "access denied"

Node access is restricted when accessed via node.module but not via

Printing out the sql that is generated after the rewrite in
taxonomy_term_page(), for example, I don't see any joins added so I
guessed that a db_rewrite_sql hook was required for this to be added
since the primary in your patch is "tid".


Tue, 01 Mar 2005 09:14:25 +0000 : chx

tangent, this is not that easy. If you rewrite taxonomy queries, you get
a chance to make a hook_db_rewrite_sql implementation which fires on
$primary_key=='tid'. The only current implementation being
node_db_rewrite_sql fires on 'nid'.


Tue, 01 Mar 2005 09:20:28 +0000 : tangent

I don't understand if you are saying that this is hard to implement or
should be handled in another module. Are you saying that
taxonomy_db_rewrite_sql() is required and needs to fire for 'tid' in
order to restrict access as I thought?


Tue, 01 Mar 2005 11:55:53 +0000 : chx

I have made some documentation on hook_db_rewrite_sql though it does not
showed up yet.


Tue, 01 Mar 2005 19:06:25 +0000 : moshe weitzman

I'd like to see this patch in core. By running taxonomy queries through
db_rewrite_sql() we can achieve two key enhancements:

- access modules can filter out terms to which the current user has no
access. this would complete our implemetnation of private forums. jose
mentioned this earlier.
- taxonomy node listings and feeds could be filtered by node type using
an upcoming simple module which recognizes '&type=event,story'  style
querystrings as a filter. this will work on taxo lists, home page list,
tracker, etc.

there are likely more uses.


Tue, 01 Mar 2005 19:16:54 +0000 : tangent

+1 for me too. The access functionality that this patch enabled is
essential in my opinion and should be in 4.6. Without it, the currently
implemented node access functionality is worthless.

I think the final patch should include a db_rewrite_sql hook to
complete the functionality though.


Sat, 05 Mar 2005 16:43:10 +0000 : Bèr Kessels

+1 from me too. But I would like to see some benchmarking with a
database with loads of terms. If someone volunteers I have a DB with
approx 300 terms and the same amount of nodes in them. Just give me a
private call (berkessels curlythingy gmx dot net) and I might forward
it (if i know you ;).


Sun, 03 Apr 2005 19:54:24 +0000 : stefan nagtegaal

Is this considered for 4.6 or 4.7??

I like it!


Sun, 03 Apr 2005 20:02:40 +0000 : chx

Do not commit this patch, it is buggy, term_page needs a few more lines
(see the privateterms taxonomy patch in my sandbox for code). Will
reroll soon.


Thu, 28 Apr 2005 21:19:58 +0000 : chx

Attachment: http://drupal.org/files/issues/mini_taxo_rewrite.patch (1.41 KB)

This time I think I'd go with small steps. This patch is -- I think --
might be enough for tid rewrites.


Sat, 07 May 2005 18:19:48 +0000 : moshe weitzman

this simple change should help us fix the remaining issue with private
forums; the dropdown where you pick which forum to post into still
shows inaccessible forums.


Sat, 21 May 2005 21:33:12 +0000 : Dries

Committed to HEAD.


Sat, 20 Aug 2005 12:01:23 +0000 : Jose A Reyero

Attachment: http://drupal.org/files/issues/taxonomy_query_rewrite_plus.patch (4.04 KB)

I think there are a few more queries that should be rewritten. Patch
updated for HEAD.


Sat, 20 Aug 2005 20:59:51 +0000 : chx

Attachment: http://drupal.org/files/issues/tid_vid_rewrite.patch (4.31 KB)

This is long overdue.


Sat, 20 Aug 2005 21:05:18 +0000 : moshe weitzman

jose - it would be nice if we had an example of the new rewrites might
be used.


Sat, 20 Aug 2005 21:11:01 +0000 : chx

This is assigned to me, so I'll be the one who answers: if we want to a
proper taxonomy access rights module -- taxonomy_access is popular --
then these are needed. The small was enough for forums but not full


Sat, 20 Aug 2005 21:34:09 +0000 : Jose A Reyero


This is already used by i18n module, and this patch was included as a
part of v4.6 of the module. Also, I've just updated i18n-HEAD and you
can give it a try.

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