[]Help with form_for

I have this rhtml, that generate a table with the object @evaluations
filled it before. The problem is that i need to get those text_field
with the data loaded, but instead it' filled all text_field whit the
last @evaluation.
What i am doing wrong?

<% form_for( @evaluations ) do |f| %>

  <table>
  <tr>
    <th>Student</th>
    <th>Commission</th>
    <th>Id</th>
    <th>Parcial 1</th>
    <th>Parcial 2</th>
    <th>Final</th>
  </tr>

  <% for evaluation in @evaluations %>
    <%= evaluation.id%>
    <tr>
      <td><%=h evaluation.student.fistName %></td>
      <td><%=h evaluation.commission.code %></td>

      <td><%=f.text_field(:id, :size => 2) %></td>
      <td><%=f.text_field(:first_evaluation, :size => 2) %></td>
      <td><%=f.text_field(:second_evaluation, :size => 2) %></td>
      <td><%=f.text_field(:final_evaluation, :size => 2) %></td>

      <td><%= link_to 'Show', evaluation %></td>
      <td><%= link_to 'Edit', edit_evaluation_path(evaluation) %></td>
      <td><%= link_to 'Destroy', evaluation, :confirm => 'Are you
sure?', :method => :delete %></td>
    </tr>
  <% end %>
  </table>

  <p>
    <%= f.submit "Update" %>
  </p>
<% end %>

Thanks you much for your help.

I have this rhtml, that generate a table with the object @evaluations
filled it before. The problem is that i need to get those text_field
with the data loaded, but instead it' filled all text_field whit the
last @evaluation.
What i am doing wrong?

form_for binds a form builder to one particular object, so trying to
use it to display text_fields for multiple objects isn't going to
work. If you're set on using a single form, you might want to look at
fields_for (fields_for gives you a form builder much like what you
would get from form_for but just generates the input tags.

Fred

Thanks,!
I founded it text_field_tag, i don’t know if is the best way, but in the controller i used:
first_evaluation = params[:first_evaluation]
Then i fill the values with those values.In the view i used:
<%= text_field_tag(“first_evaluation[]”, evaluation.first_evaluation, :size => 2 ). What do you thing about it?

Sallu2…