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I'm writing a simple project-specific plugin that sends a notification to the site admin when a new user is registered. I have an HTML template that I'd like to use for this.

In my plugin's main class, I have the following function:

public function init()
    {
        parent::init();
        // Events
        craft()->on('users.saveUser', function(Event $event) {
            $user = $event->params['user'];
            $isNewUser = $event->params['isNewUser'];

            if ($isNewUser)
            {
                // Send notification email
                craft()->aeiMember->registrationNotification($user);
            }
        });
    }

which calls a one of my plugin's services, 'registrationNotification'. Here's the code I have for that service:

public function registrationNotification(UserModel $savedUser)
    {
        $user = new \stdClass();

        $user->firstName            = $savedUser->firstName;
        $user->lastName             = $savedUser->lastName;
        $user->email                = $savedUser->email;
        $user->aeiGroups            = $savedUser->aeiGroups;
        $user->phone                = $savedUser->phone;
        $user->mailingAddress       = $savedUser->mailingAddress;
        $user->city                 = $savedUser->city;
        $user->state                = $savedUser->state;
        $user->zip                  = $savedUser->zip;
        $user->country              = $savedUser->country;
        $user->preferredDealer      = $savedUser->preferredDealer;
        $user->dealerAccountNumber  = $savedUser->dealerAccountNumber;
        $user->school               = $savedUser->school;
        $user->expectedGraduationDate = $savedUser->expectedGraduationDate;

        $email = new EmailModel();
        $email->toEmail = '...myemailaddress...';
        $email->subject = 'New User Registration: ' . $user->firstName . ' ' . $user->lastName;
        $email->htmlBody = craft()->templates->render('aeiMember/registration_notification', array(
            'user' => $user,
        ));

        // Send
        if (craft()->email->sendEmail($email))
        {
            return true;
        }
    }

When I submit the registration form, I get the following error: "CDbException: CDbTransaction is inactive and cannot perform commit or roll back operations.". I narrowed down the issue, and if I use a non-HTML email body, everything works fine, so apparently there's an issue with rendering a template at this event.

Here's a link to a Google Doc with the stack trace: https://docs.google.com/document/d/1atFNkktuZQ91hU9QipXYMhOCHNGAavO5qUI_TF5jSeE/edit?usp=sharing

Am I doing something wrong, or is there a workaround to accomplish what I'm after? It seems like it should be pretty simple.

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    Is your non-HTML email body still accessing all the values of the stdClass object? CDbTransaction is a database class for DB transactions and I can't even begin to understand why this code here is concerned with hitting the database. Do you have devMode on? If so, could you post the stack trace? – Matt Stauffer Jun 24 '14 at 4:05
  • Good point - no, the non-HTML email body wasn't accessing any values. I reviewed the template, and the only variables it is accessing are 'user' and the global 'now'. I do have devMode on, I've edited my question to include a link to the stack trace. – shanecavaliere Jun 24 '14 at 14:59
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    If you substitute the craft()->templates->render call with some static html, do you get the same error? If you do the template render call and store the contents in a variable (and don't add it as a htmlBody), do you get the same error? – André Elvan Jun 24 '14 at 15:09
  • What's confusing is that the stack trace shows the error on saving the user, which should happen before this is triggered, so I don't know why the email template would affect it. As far as I can tell it hasn't even hit the "'onEndRequest'" yet. If @aelvan's questions don't get you anywhere, you might need to just submit a support request. – Matt Stauffer Jun 24 '14 at 15:13
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    What does the registration_notification template look like? Something is triggering a call to UsersController->saveUser when calling render() and I suspect that's something in your template code? – Brad Bell Jun 24 '14 at 15:37
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The issue turned out to be the result of a variable name mistake on my part. I had typed in an incorrect variable name in the email template. I actually still don't really understand what that has to do with a database transaction, though.

EDIT: If anyone else is running into a similar issue, I've found a way to get a more useful error message, as opposed to the "CDbTransaction is inactive" message, which doesn't help much. If you go to craft/app/services/UsersService.php, and comment out line 311 ("$transaction->rollback();"), then Yii won't give you the CDbTransaction error before Craft has a chance to tell you its more helpful error. This should give you a better idea of what you're doing wrong. Obviously, don't forget to un-comment that line after you've fixed your issue.

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    It was probably triggering some lazy-loading method for users which was, in-turn, making a call to the database to attempt to retrieve data. – Brad Bell Jun 24 '14 at 21:36
  • Very helpful EDIT tip. The line is #320 now. (Craft 2.6.2780) – Marion Newlevant Apr 19 '16 at 23:59
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It throws the error, since it fires the event in the transaction try-catch, and Twig was throwing the exception. In the catch block then it tried to execute the rollback.

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