Rails - Aug 2007 - Can't update due to validation limitation.

I''ve got an odd case where the certain models doesn''t want to
either
update and/or create a new one.  The problem, as I later found out,
was due to validation errors (which is great, actually) except for
some reason, <%= error_messages_for ''some_model'' %>
doesn''t print
anything.  This is problematic, because as it turns out, one of my
user models won''t update because I have to provide a new password,
each time.

Long story short, I have two problems:

error_messages_for method doesn''t seem to print anything.  Does this
have to do with how I''m bringing up the code in my controller?  A
typical update method in my controllers look like this:
-------------------------------------
def edit_user
  @user=User.find(params[:id])
end

def update_user
  @user=User.find(params[:id])
  if !params[:user]
    flash[:notice]=nil
    render :action => ''edit_user''
  elsif @user.update_attributes(params[:user])
    flash[:notice] = "#{@user.username} was successfully updated."
    redirect_to #someplace.
  else
    flash[:notice]="Failed to update user.  Please try again."
    render :action => ''edit_user''
  end
end
--------------------------------------
Does flash[:notice] prevent error_messages_for from showing up?  Last
time I tried taking off that line, error_messages_for gave me nothing!

The second problem is how do I update only portions of the model
(preferably some method that accepts an :except parameter) given by
the text field in the view forms that''s supposed to update the model.
I''m currently using the method update_attributes(params[:user]), and I
DON''T want it to update the password if the password field is empty,
which this method seems to be doing.


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> The second problem is how do I update only portions of the model
> (preferably some method that accepts an :except parameter) given by
> the text field in the view forms that''s supposed to update the
model.
> I''m currently using the method update_attributes(params[:user]),
and I
> DON''T want it to update the password if the password field is
empty,
> which this method seems to be doing.
I forgot to mention that I want the method to update portions of the
Model while, at the same time, passes through the validation filter.
I also realized half the problem also lies on how some parameters are
required in the user model.  By using singular update method, do I
have to pass through those validation filters as well?


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