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Added upgrade note for config static immutability

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Config statics are now immutable for performance, this requires an upgrade change.
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Sam Minnée 2013-03-13 11:22:41 +13:00
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docs/en/changelogs/3.1.0.md
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@ -30,6 +30,23 @@
## Upgrading
### Static configuration properties are now immutable, you must use Config API.
A common SilverStripe pattern is to use a static variable on a class to define a configuration parameter.
The configuration system added in SilverStripe 3.0 builds on this by using this static variable as a way
of defining the default value.
In SilverStripe 3.0, it was possible to edit this value at run-time and have the change propagate into the
configuration system. This is no longer the case, for performance reasons.
Many of the configuration variables have been change to "private" so that attempts to change them throw an
error, but if you do have a configuration static that is able to be changed, and you change it, then the
configuration system will silently ignore it.
Please change all run-time manipulation of configuration to use `Config::inst()->update()` or
`$this->config()->update()`. For more information about how to use the config system, see the
["Configuration" topic](/topic/configuration).
### Deny URL access if `Controller::$allowed_actions` is undefined or empty array
In order to make controller access checks more consistent and easier to