Hi,
    currently i am using rails 2.2.2.
I have developed some project using rails 2.2.2, ruby 1.8.6 and gem
1.3.1.
Now i want to use some cool features in rails 2.3.4 like
default_scope,accepts_nested_attributes_for..etc.
So i wants  to upgrade the rails version from 2.2.2 to 2.3.4.
My doubts are

1) Is there any problem will occur after i updated the rails version for
the project that was done by rails 2.2.2
2) I want to know how to update the existing project to new version.

Thanks in Advance

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