0
@@ -91,4 +91,34 @@ before_filter :log_in!,
0
   :only => [:new, :create],
0
   :unless => :logged_in?
0
 
0
+What When does NOT support
0
+==========================
0
+
0
+# ActiveRecord String callbacks
0
+before_create 'self.password = password.to_sha1',
0
+  :unless => lambda {|user| user.password_confirmation.blank?}
0
+
0
+# ActiveRecord Class callbacks
0
+before_create PasswordEncryptor,
0
+  :unless => lambda {|user| user.password_confirmation.blank?}
0
+
0
+# ActiveRecord Block callbacks
0
+before_create(:unless => lambda {|user| user.password_confirmation.blank?}) do |record|
0
+  record.password = record.password.to_sha1
0
+end	
0
+
0
+# ActionController Block filters
0
+before_filter(:unless => :logged_in?) do |controller|
0
+  redirect_to new_session_path
0
+end
0
+
0
+# ActionController Class filters
0
+before_filter Authorizer,
0
+  :unless => :logged_in?
0
+
0
+When will not work if your code contains any of these.
0
+
0
+In our experience we've never used any of these types of callbacks and filters.  By using Symbols, i.e. methods,
0
+the resulting code is much more intention revealing.  Class callbacks and filters we feel are most of the time overkill.
0
+
0
 Copyright (c) 2008 Jared Carroll and Dan Croak, released under the MIT license