Ruby on Rails

I have in my view a select <td><%= select :nomdefaut, @mydefaut,
@ndefaut%></td>

I see the different values of @ndefaut but then but then @mydefaut is
supposed to contain the selected value in the list but when I display
@mydefaut in the view my text field is blank.

I see that we can use collection_tag too but they never show how to
recover the selected value.

Somebody can help me?

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