function calling in RoR

i m new in RoR..I have created a function in my controller
def create_by
.how can i call this one by using a link from my view this
function should be called when clicking on some field like name...

  so in my index how can i call this function using a link
.<th><%= link_to _created_by 'name' %></th>..
i have used this..but getting errors...can anybody help me...

u can call like
<%= link_to “Name” controller_path %>

or in other words

:link_to, :controller => 'controllername', :action =>

controller functions dont accept arguments. so calling your function
like link_to _created_by 'name' is wrong for several reasons:

1) you misspelled your function name _create_by instead of create_by
2) you passed name as an argument (you should use params)