[Ruby] How do I add a selection dropdown to a default scaffold form

[Bob Marley]

Say I have this form _form.rhtml, how do I turn the product ID into a drop
down selection instead of a text field?

I am having difficulty finding documentation on how to use the from.select,
this combined w/my noobness of rails
makes it tough to make work.

Do I need to replace the <!--[form:watch]-->/<!--[eoform:watch]--> with a <%
form_for :watches %> / <% end %> ?

thanks for any help offered.
miene

Here's my controller: watch_controller.rb
def new
    @watch = Watch.new
    @watch.watchdate = Time.now

    @productOptions = {"ProductA"=>25, "ProductB"=>32}
end

the view _form.rhtml

<%= error_messages_for 'watch' %>

<!--[form:watch]-->
<p><label for="watch_status">Status</label><br/>
<%= @watch.status  %></p>

....lots of scaffold code

<p><label for="watch_archivenumber">Archivenumber</label><br/>
<%= text_field 'watch', 'archivenumber'  %></p>

<p><label for="watch_productid">Productid</label><br/>
<%= @productOptions.each{|x| print x.to_s } %><br/>  #test to verify hash
prints (it does)
<%= form.select(:productid, @productOptions) %>   #How do I turn this into a
drop down selection??? Instead of a text field

<!--[eoform:watch]-->

database looks like this:
drop table if exists watches;
create table watches(
    id                     int            not null auto_increment,
    status                 varchar(100)   not null default 'set watch',
    watchdate              DATETIME       not null,
    buildURL               varchar(255)   not null, #Horton Report for Build
URL link
    installername          varchar(100)   not null default 'RhapsodyReal.exe
',
    extras                 varchar(255)   null default 'pyrhapsody.exe',
#files to copy to viper.qa in comma sep format
    archivename            varchar(100)   null,
    archivenumber          varchar(100)   null,
    productid              int            not null,
    primary key(id)
) engine=InnoDB;

if you read this far, again huge thanks for any help,
miene