I have a Bundle containing some entities and resources shared by two apps in diferent hosts. That entities were coded using symfony 2.0. Now I want to upgrade one of apps to symfony 2.1 and the other continue using symfony 2.0. Is this posible?
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Symfony 2.0 and 2.1 use different Doctrine versions. It’s not really a question about Symfony but rather about Doctrine (which is a separate project).
You should check if there were any backwards incompatible changes in Doctrine. But I think you’ll be fine. If you have a test suite, it should catch all the behavior changes.