ruby - create a unique number using Rails 3 -


i need create random number each time page loaded. have view page below.

index.html.erb:

<th style="width: 30%; text-align:left; vertical-align: top;">date: <%= date.today.to_s %><br />                     bill no.: </th>

in file, want create new unique bill number each time page loaded. please me resolve error.

<th style="width: 30%; text-align:left; vertical-align: top;">date: <%= date.today.to_s %><br />                 bill no.: <%= rand(10000) %></th>

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