Rails - Nov 2008 - Upgrade guide for 2.0.2 to 2.2.2

Hey all,

I believe I have upgraded my Rails version from 2.0.2 to 2.2.2 ;) 
However, I am experiencing some problems with an app that was built on 
2.0.2. Can anyone suggest a resource where I can learn more about how to 
properly upgrade from 2.0.2 to 2.2.2

I have read some of the what has changed stuff but I get some weird 
errors that I reckon relates to something else like for example a simple 
line such as the following:

@about = Content.find_by_permalink(''about'')

throwing and error such as the following:

ArgumentError (NULL pointer given):
     (eval):3:in `each_hash''
     (eval):3:in `all_hashes''
 
C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_record/connection_adapters/mysql_adapter.rb:564:in
`select''

Thank you in advance,
Schalk

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On Nov 22, 2:27 pm, Schalk Neethling
<volume4.sch...-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
wrote:
> Hey all,
>
> I believe I have upgraded my Rails version from 2.0.2 to 2.2.2 ;)
> However, I am experiencing some problems with an app that was built on
> 2.0.2. Can anyone suggest a resource where I can learn more about how to
> properly upgrade from 2.0.2 to 2.2.2
>
You''d probably find it easier to go to 2.1.2 first, find/fix
deprecated stuff and then move to 2.2.2

Fred
> I have read some of the what has changed stuff but I get some weird
> errors that I reckon relates to something else like for example a simple
> line such as the following:
>
> @about = Content.find_by_permalink(''about'')
>
> throwing and error such as the following:
>
> ArgumentError (NULL pointer given):
>      (eval):3:in `each_hash''
>      (eval):3:in `all_hashes''
>
> C:/InstantRails/ruby/lib/ruby/gems/1.8/gems/activerecord-2.2.2/lib/active_r
ecord/connection_adapters/mysql_adapter.rb:564:in
> `select''
>
> Thank you in advance,
> Schalk
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