34 lines
2.0 KiB
Markdown
34 lines
2.0 KiB
Markdown
# Tips and Common Mistakes
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This is a collection of tips and common mistakes or errors you may encounter.
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## Never edit the `system` folder!
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You should (almost) never edit the system folder. Any change you want to make to files in system and modules can be made via the [cascading filesystem](files) and [transparent extension](extension) and won't break when you try to update your Kohana version.
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## Don't try and use one route for everything
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Kohana 3 [routes](routing) are very powerful and flexible, don't be afraid to use as many as you need to make your app function the way you want!
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## Reflection_Exception
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If you get a Reflection_Exception when setting up your site, it is almost certainly because your [Kohana::init] 'base_url' setting is wrong. If your base url is correct something is probably wrong with your [routes](routing).
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ReflectionException [ -1 ]: Class controller_<something> does not exist
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// where <something> is part of the url you entered in your browser
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### Solution {#reflection-exception-solution}
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Set your [Kohana::init] 'base_url' to the correct setting. The base url should be the path to your index.php file relative to the webserver document root.
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## ORM/Session __sleep() bug
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There is a bug in php which can corrupt your session after a fatal error. A production server shouldn't have uncaught fatal errors, so this bug should only happen during development, when you do something stupid and cause a fatal error. On the next page load you will get a database connection error, then all subsequent page loads will display the following error:
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ErrorException [ Notice ]: Undefined index: id
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MODPATH/orm/classes/kohana/orm.php [ 1308 ]
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### Solution {#orm-session-sleep-solution}
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To fix this, clear your cookies for that domain to reset your session. This should never happen on a production server, so you won't have to explain to your clients how to clear their cookies. You can see the [discussion on this issue](http://dev.kohanaframework.org/issues/3242) for more details.
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