Rails 2.0 deprecated warning

and, how do i fix this, in newbie terms...?!

You need to do exactly what the deprecation message says: don't use
has_avatar?

<% if @user.has_avatar? %>
...

becomes

<% if @user.avatar %>

There are a couple other things deprecated in 2.0 that cause compiler
crashes (although they work in 1.2): namely "@params" and "@request",
which should be replaced with "params" and "request".

It's mentioned in an article here:
http://www.railsrocket.com/migrating-to-rails-20

i want to full coding in on or more project
what about i have lot of things in ruby on rails place help me

Oi want to full coding in on or more project
what about i have lot of things in ruby on rails place help me