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accesslib: Draft get_context_users_byrole()

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Draft - use for the course participants list page

 Uses 1 DB query (cheap too - 2~7ms).

 TODO:
 - implement additional where clauses
 - sorting
 - get course participants list to use it!

 returns a users array, both sorted _and_ keyed
 on id (as get_my_courses() does)

 as a bonus, every user record comes with its own
 personal context, as our callers need it straight away
 {save 1 dbquery per user! yay!}
This commit is contained in:
martinlanghoff
2007-09-19 07:05:21 +00:00
parent 352f6f74fc
commit b5a645b4eb
1 changed files with 72 additions and 4 deletions
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lib/accesslib.php
+72 -4
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@@ -687,9 +687,6 @@ function get_user_courses_bycap($userid, $cap, $sess, $doanything, $sort='c.sort
$basefields = array('id', 'sortorder', 'shortname', 'idnumber');
if (!is_null($fields)) {
if (!is_array($fields)) {
error_log(print_r($fields,1));
}
$fields = array_merge($basefields, $fields);
$fields = array_unique($fields);
} else {
@@ -791,6 +788,75 @@ function get_user_courses_bycap($userid, $cap, $sess, $doanything, $sort='c.sort
return $courses;
}
/*
* Draft - use for the course participants list page
*
* Uses 1 DB query (cheap too - 2~7ms).
*
* TODO:
* - implement additional where clauses
* - sorting
* - get course participants list to use it!
*
* returns a users array, both sorted _and_ keyed
* on id (as get_my_courses() does)
*
* as a bonus, every user record comes with its own
* personal context, as our callers need it straight away
* {save 1 dbquery per user! yay!}
*
*/
function get_context_users_byrole ($context, $roleid, $fields=NULL, $where=NULL, $sort=NULL, $limit=0) {
global $CFG;
// Slim base fields, let callers ask for what they need...
$basefields = array('id', 'username');
if (!is_null($fields)) {
$fields = array_merge($basefields, $fields);
$fields = array_unique($fields);
} else {
$fields = $basefields;
}
$userfields = 'u.' .join(',u.', $fields);
$contexts = substr($context->path, 1); // kill leading slash
$contexts = str_replace('/', ',', $contexts);
$sql = "SELECT $userfields,
ctx.id AS ctxid, ctx.path AS ctxpath, ctx.depth as ctxdepth
FROM {$CFG->prefix}user u
JOIN {$CFG->prefix}context ctx
ON (u.id=ctx.instanceid AND ctx.contextlevel=".CONTEXT_USER.")
JOIN {$CFG->prefix}role_assignments ra
ON u.id = ra.userid
WHERE ra.roleid = $roleid
AND ra.contextid IN ($contexts)";
$rs = get_recordset_sql($sql);
$users = array();
$cc = 0; // keep count
if ($rs->RecordCount()) {
while ($u = rs_fetch_next_record($rs)) {
// build the context obj
$ctx = new StdClass;
$ctx->id = $u->ctxid; unset($u->ctxid);
$ctx->path = $u->ctxpath; unset($u->ctxpath);
$ctx->depth = $u->ctxdepth; unset($u->ctxdepth);
$ctx->instanceid = $u->id;
$ctx->contextlevel = CONTEXT_USER;
$u->context = $ctx;
$users[] = $u;
if ($limit > 0 && $cc++ > $limit) {
break;
}
}
}
rs_close($rs);
return $users;
}
/**
* This function returns whether the current user has the capability of performing a function
* For example, we can do has_capability('mod/forum:replypost',$context) in forum
@@ -1604,7 +1670,9 @@ function get_user_access_sitewide($userid) {
$acc['rdef'][$k][$ra->capability] = $ra->permission;
}
$parentids = explode('/', $ra->path);
array_pop($parentids); array_shift($parentids);
array_shift($parentids); // drop empty leading "context"
array_pop($parentids); // drop _this_ context
if (isset($raparents[$ra->roleid])) {
$raparents[$ra->roleid] = array_merge($raparents[$ra->roleid], $parentids);
} else {