Thought I'd make a thread with a brief overview of all my Laravel-specific (and some not so specific...
Looks like any amount of HTML inside the post causes the problem as they are not escaped.
$model->getAttributes() will return an array of raw attributes (as they are stored in the databas...
Do you also have a getArguments method on your command? Make sure it returns an array as well.
Creating a single instance of a class is never a big deal.
Have a look at http://wiki.laravel.io/Laravel_4_Auth_pitfalls
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