Get url for current page, but with a different format

Question

Using rails 2. I want a link to the current page (whatever it is) that keeps all of the params the same but changes the format to \'csv\'. (setting the format can be done b

Answer 1

<%= link_to "This page in CSV", {:format => :csv } %>
<%= link_to "This page in PDF", {:format => :pdf } %>
<%= link_to "This page in JPEG", {:format => :jpeg } %>

EDIT

Add helper

def current_url(new_params)
  url_for :params => params.merge(new_params)
end

then use this

<%= link_to "This page in CSV", current_url(:format => :csv ) %>

EDIT 2

Or improve your hack:

def current_url(new_params)
  params.merge!(new_params)
  string = params.map{ |k,v| "#{k}=#{v}" }.join("&")
  request.uri.split("?")[0] + "?" + string
end

EDIT

IMPORTANT! @floor - your approach above has a serious problem - it directly modifies params, so if you've got anything after a call to this method which uses params (such as will_paginate links for example) then that will get the modified version which you used to build your link. I changed it to call .dup on params and then modify the duplicated object rather than modifying params directly. – @Max Williams