How would I check if a value is found in an array of values

I want to perform an if condition where, if linkedpub.LPU_ID is found in an array of values(@associated_linked_pub), do some action.

I tried the following but the syntax is not correct.

Any suggestion is most welcomed..Thanks a lot

<% for linkedpub in Linkedpub.find(:all) %>
   <% if linkedpub.LPU_ID IN @associated_linked_pub  %>
       # do action
   <%end%>
<%end%>