Rails - Apr 2008 - Modify an AR model attribute before reading into form_for

Hi,

I''m trying to modify an AR model''s foo attribute before
reading into
the model''s edit form. I''ve tried the following:

class Model
  def foo
    "the foo attribute is " + read_attribute(:foo)
  end
end

If I use a form_for on the edit view with the following code, I get
the plain database value inside the text field and the AR value next
to it:

<% form_for(@model) do |f| %>
  <%= f.text_field, :foo %> <%= @model.foo %>
<% end %>

It seems like they should show the same value but they don''t. What am
I missing?

Thanks,
Harry
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More on this topic. If I use a plain HTML input tag like so:

<input type="text" id="model_foo"
name="model[foo]" value="<%@model.foo %>"/>

I get the correct value in the input box.

Does anyone know how FormBuilder gets its values? Is this a bug or is
it expected?

Harry
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