Added the necessary code for updating the grade category that a project belongs in whenever it or it's participants are modified.

api.php

@@ -1051,13 +1051,14 @@ switch($request[0]) {
 				description(remove the current user from an existing project.  If no other users are in the project, then it is deleted.)
 			*/
 			case 'remove':
-				if(!array_key_exists('registration_id', $_SESSION)){
+				$regId = getRegistrationsId($_SESSION['users_id']);
+				if(!$regId){
 					$ret['status'] = 'error';
 					$ret['error'] = 'current user not associated with a project';
 					break;
 				}
 
-				$result = removeProject($_SESSION['registration_id']);
+				$result = removeProject($regId);
 				if($result != 'ok'){
 					$ret['status'] = "error";
 					$ret['error'] = $result;

projects.inc.php

@@ -290,6 +290,21 @@ function project_load($pid)
 	return $proj;
 }
 
-
+function getProjectCategory($registrations_id){
+	global $conference;
+	$q=mysql_query("SELECT MAX(grade) AS maxgrade FROM users WHERE registrations_id='$registrations_id'");
+	$gradeinfo=mysql_fetch_object($q);
+	$projectcategories_id = null;
+	//now lets grab all the age categories, so we can choose one based on the max grade
+	$q=mysql_query("SELECT * FROM projectcategories WHERE conferences_id='".$conference['id']."' ORDER BY id");
+	while(($r=mysql_fetch_object($q)) && $projectcategories_id === null)
+	{
+		if($gradeinfo->maxgrade >= $r->mingrade && $gradeinfo->maxgrade <= $r->maxgrade)
+		{
+			$projectcategories_id = $r->id;
+		}
+	}
+	return $projectcategories_id;
+}
 
 ?>

register_participants.inc.php

@@ -25,6 +25,7 @@
 // legacy - functions previously included here have been split off into participants.inc.php,
 // but expected in this file by other code
 require_once("participant.inc.php");
+require_once("projects.inc.php");
 
 function generateProjectNumber($registration_id)
 {
@@ -452,10 +453,12 @@ function getProject($userId){
 // add a project
 function addProject($registrations_id){
 	global $conference;
+	// get the appropriate category for this project
+	$projCategory = getProjectCategory($registrations_id);
  	mysql_query("
-		INSERT INTO projects(registrations_id, conferences_id)
-		VALUES ('" . $registrations_id . "','" . $conference['id']."')
-	"); 
+		INSERT INTO projects(registrations_id, conferences_id, projectcategories_id)
+		VALUES ('" . $registrations_id . "','" . $conference['id']."', '$projCategory')
+	");
 	//now query the one we just inserted
  	$q = mysql_query("SELECT * FROM projects WHERE registrations_id='$registrations_id' AND conferences_id='{$conference['id']}'");
 	if(mysql_error()) {
@@ -476,7 +479,7 @@ function joinProject($registration_number, $email){
 		return 'register_participants.inc.php::joinProject -> you are already registered for a project';
 	}
 
-	// let's avoid an SQL naughtiness
+	// let's avoid any SQL naughtiness
 	$email = mysql_real_escape_string($email);
 	$registration_number  = intval($registration_number);
 
@@ -503,6 +506,16 @@ function joinProject($registration_number, $email){
 	if(mysql_error()){
 		return "register_participants.inc.php::joinProject -> " . mysql_error();
 	}
+	
+	// finally, we can update the project's age category if necessary
+	$category = getProjectCategory($registration_id);
+	if($category !== null){
+		mysql_query("UPDATE projects SET projectcategories_id = $category WHERE registrations_id = $registration_id");
+		if(mysql_error()){
+			return "register_participants.inc.php::joinProject -> " . mysql_error();
+		}
+	}
+
 
 	return 'ok';
 }
@@ -690,5 +703,5 @@ function getMentors($registrations_id){
 		$returnval[] = $row;
 	}
 	return $returnval;
-}	
+}
 ?>

user.inc.php

@@ -869,7 +869,16 @@ function user_save(&$u)
 		if(mysql_error() != '') return "SQLERR7: " . mysql_error();
 	}
 
+	if($u['orig']['grade'] != $u['grade'] && $u['registrations_id']){
+		// their grade has changed and they're connected to a registration.  Let's update
+		// the registration's grade level to match if necessary
+		$category = getProjectCategory($u['registrations_id']);
+		if($category !== null){
+			mysql_query("UPDATE projects SET projectcategories_id = $category WHERE registrations_id = $registration_id");
+			if(mysql_error() != '') return "SQLERR8: " . mysql_error();
+		}
 
+	}
 	/* Record all the data in orig that we saved so subsequent
 	 * calls to user_save don't try to overwrite data already
 	 * saved to the database */