[Rails] Symbols not recognized after nesting routes - NoMethodError in Timesheets#new

[Smashing]

For some reason The symbols in my new timesheet form aren't being recognized 
after I nested the routes. 

I go to: http://localhost:3000/users/1/timesheets/new

and receive the error: 

NoMethodError in Timesheets#new

Showing */Rails/timecard/app/views/timesheets/new.html.erb* where line *#8*
 raised:

undefined method `user_id' for #<User:0x00000001eb0748>

Extracted source (around line *#8*):

5: 
6:   <div class="field">
7:     <%= f.label :user_id %><br />
8:     <%= f.text_field :user_id %>
9:   </div>
10:   <div class="field">
11:     <%= f.label :time_in %><br />


I have 2 models, Timesheet and User
Timesheet belongs_to :user
User  has_many :timesheets

routes.rb:
---------------------------------------------------------
Timecard::Application.routes.draw do
  devise_for :users
  
  resources :users do
    resources :timesheets
    collection do
      get 'punch_in'
      get 'punch_out'
      post 'punch_in_now'
      post 'punch_out_now'
    end
  end

  root :to => "users#punch_in"
end
---------------------------------------------------------
timesheets_controller.rb new function:  
def new
    @timesheet = Timesheet.new(:user_id => params[:user_id])

    respond_to do |format|
      format.html # new.html.erb
      format.xml  { render :xml => @timesheet }
    end
  end
----------------------------------------------------------
new.html.erb - new timesheets view:
<h1>New timesheet</h1>

<%= form_for(@timesheet.user, @timesheet) do |f| %>


  <div class="field">
    <%= f.label :user_id %><br />
    <%= f.text_field :user_id %>
  </div>
  <div class="field">
    <%= f.label :time_in %><br />
    <%= f.datetime_select :time_in %>
  </div>
  <div class="field">
    <%= f.label :time_out %><br />
    <%= f.datetime_select :time_out %>
  </div>
  <div class="field">
    <%= f.label :comments %><br />
    <%= f.text_area :comments %>
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>
-------------------------------------------------------------------------------

if I remove <%= f.text_field :user_id %> then it gives the same error on <%= 
f.datetime_select :time_in %>
The view worked fine before I changed the routing to the more restful, 
nested route. I've tried switching up 
the form_for statement to diffrent things like <%= form_for(@user, 
@timesheet) do |f| %> and 
<%= form_for(@timesheet.user, @timesheet.build) do |f| %>  with no success, 
I just dont' understand 
why changing the route would break rails understanding of what :user_id is.

Any help would be much appreciated. 

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