Storing & retrieving a serialized hash in the DB is not working.

Hey all,

I am trying to find a way to store an hash of variable size (could be
3 pairs, could by 8 pairs) in a text field in the database. I have
the following [simplified] setup:

# model
  serialize :content

# controller
  [all the normal create, edit, etc. stuf]

# view
<% form_for @grading_scale do |f| %>
    <%= f.text_field 'content[1][letter]' %>
    <%= f.text_field 'content[1][grade]' %>
    <%= f.text_field 'content[2][letter]' %>
    <%= f.text_field 'content[2][grade]' %>
      ...
  <% end %>

This actually stores the correct data in the database and it even
shows up in the view when I show <%= debug @scale %>. However, no
matter how hard I try I cannot get it to display the data from the
database in the text fields. I can change/add new data without
problems but I can't show the user the data. What am I doing wrong?

Thanx!
  Richard