form_tag not routing correctly
<%= form_tag search_post_path, method: :get do %>
    <br />
    <fieldset>
      <legend>Search</legend>
      <%= text_field_tag :search, params[:search], :id => 'search_field' %>
      <%= submit_tag "Search", :name => nil %>
      <%= link_to_function "Clear", "$('search_field').clear()" %>
    </fieldset>
    <br />
  <% end %>

post 'search' => 'posts#search'

  resources :posts do
    member do
      post 'search'
      get 'search'
    end
  end

resources :posts do
  collection do
    get 'search'
  end
end