Modify an AR model attribute before reading into form_for

rubyonrails-talk
1

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

2

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