Rails - Oct 2007 - why I can't update data, but I can insert data into new model

why I can''t update data, but I can insert data into new model.
like this:
if File.find_by_id(id)
file=File.find_by_id(id)
else
file=File.new

file.name=name
file.save

there is a problem, when there don''t find id, there is no problem, But
when find id, update the field,
there is Error,  there said: undefined method ''name=''
why? who can help me? Thanks!!


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