Posted by chrisschaub on June 21, 2011 at 4:45pm
In the drupal 6 rules code, in
rules/modules/node.rules.inc
there is this code:
class rules_data_type_node extends rules_data_type {
function save() {
$node = &$this->get();
// Bug fix: Make sure we don't create another revision when we react on the
// creation of an revision.
unset($node->revision);
node_save($node);
...I'm not sure what bug this was fixing, but it does prevent rules from saving revisions when updating node fields. Is this desirable? I guess a work-around is to create another module to hook nodeapi and re-set the revision flag on presave. Just wondering if anyone else has tried to get rules to save revisions when updating content.

Comments
It's not as easy as setting
It's not as easy as setting the revision flag in node presave, that will cause dupe revisions which is, I'm assuming, the purpose of this bug fix in the code. So, how can I get updates to nodes to create revisions with triggered rules? Any help is greatly appreciated.
Actually, creating my own
Actually, creating my own "flag" in the node object/variable, and then creating a presave op in nodeapi in a custom module did the trick. This way, I can have rules create revisions and set revision log messages as needed.
Can you expand a little
Can you expand a little exactly how you created your own flag, and what the nodeapi presave looks like?
I may need to do something similar, with the Flag module being so buggy in Drupal 7.