action.rb

class Action < ActiveRecord::Base
  belongs_to :day
  attr_accessible :energy, :mood, :overall
end

actions_controller.rb

class ActionsController < ApplicationController
  
  before_filter :get_day
  
  def get_day
    @day = Day.find(params[:day_id])
  end
  
  def create
    @action = @day.actions.new(params[:action])
    if @action.save
      redirect_to @day
    else
      render "day/show"
    end
  end
  

end

day.rb

class Day < ActiveRecord::Base
  attr_accessible :sleep, :wake
  has_one :action
end

days_controller.rb

class DaysController < ApplicationController
  
  before_filter :get_day, :only => [:show, :edit, :update, :destroy]
  
  def get_day
    @day = Day.find(params[:id])
  end
  
  def index
    @days = Day.all
  end
  
  def show
    @action = @day.action.new
  end

  def new
    @day = Day.new
  end

  def create
    @day = Day.new(params[:day])
    if @day.save
      redirect_to days_path
    else
      render "new"
    end
  end
  
  def edit
    @day = Day.find(params[:id])
  end
  
  def update
    if @day.update_attributes(params[:day])
      redirect_to days_path
    else
      render "edit"
    end
  end
  
  def destroy
    @day.destroy
    redirect_to days_path
  end
  
  
end

routes.rb

Life::Application.routes.draw do

  resources :days do
    resources :actions
  end
  
  root :to => "Days#index"

end

show.html.erb

<%= link_to "Back", days_path %>

<table id="days-list">
  <thead>
    <tr>
	  <th>Date</th>
	  <th>Wake</th>
	  <th>Sleep</th>
	</tr>
  </thead>
 
  <tbody>
	<tr>
	  <td><%= @day.created_at.strftime("%x")  %></td>
	  <td><%= @day.wake  %></td>
	  <td><%= @day.sleep  %></td>
	  <td><%= link_to "Edit", edit_day_path(@day) %></td>
	  <td><%= link_to "Delete", @day, :confirm => "Sure?", :method => :delete  %></td>
	</tr>
  </tbody>

</table>

<%= render "actions/new_action" %>