[Catalyst] Catalyst $c->request->params

[疾驰者]

Dear friends:  
    I read and follow http://www.catalystframework.org/calendar/2012/8 article, These code
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 $c->request->params 
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in controller Manage.pm, and 
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write_file $database_file, { append => 1 },
      "$id|$params->{first_name}|$params->{last_name}|$params->{email}\n";
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in model DB.pm, 'first_name' and 'last_name' can't get from database_file.txt and  two pm file.

   What's the principle?
   $c is so import and complex, how can I get it from formal pod document or some special article such as http://www.catalystframework.org/calendar/2012/8? 

  Thanks a lot.
                                                                                                                      Thai Heng
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