diff --git a/Gemfile b/Gemfile
index a7e2769..aa2c8c9 100644
--- a/Gemfile
+++ b/Gemfile
@@ -2,11 +2,6 @@ source 'https://rubygems.org'
 
 gem 'rails', '3.2.12'
 
-# Bundle edge Rails instead:
-# gem 'rails', :git => 'git://github.com/rails/rails.git'
-
-
-
 # Gems used only for assets and not required
 # in production environments by default.
 group :assets do
@@ -36,11 +31,16 @@ gem 'jquery-rails'
 # To use debugger
 # gem 'debugger'
 
-gem 'mongo_mapper'
-gem 'bson_ext'
 gem 'haml-rails'
-gem 'mm-multi-parameter-attributes'
 gem 'feedzirra'
 gem 'htmlentities'
 gem 'sorcery'
 gem 'will_paginate', '~> 3.0'
+gem 'activerecord-postgresql-adapter'
+gem 'pg'
+
+group :development do
+  gem 'meta_request' 
+  gem 'better_errors'
+  gem 'binding_of_caller'
+end
diff --git a/Gemfile.lock b/Gemfile.lock
index 72ae3f3..269c60d 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -22,6 +22,8 @@ GEM
       activesupport (= 3.2.12)
       arel (~> 3.0.2)
       tzinfo (~> 0.3.29)
+    activerecord-postgresql-adapter (0.0.1)
+      pg
     activeresource (3.2.12)
       activemodel (= 3.2.12)
       activesupport (= 3.2.12)
@@ -30,10 +32,13 @@ GEM
       multi_json (~> 1.0)
     arel (3.0.2)
     bcrypt-ruby (3.0.1)
-    bson (1.8.2)
-    bson_ext (1.8.2)
-      bson (~> 1.8.2)
+    better_errors (0.6.0)
+      coderay (>= 1.0.0)
+      erubis (>= 2.6.6)
+    binding_of_caller (0.7.1)
+      debug_inspector (>= 0.0.1)
     builder (3.0.4)
+    coderay (1.0.9)
     coffee-rails (3.2.2)
       coffee-script (>= 2.2.0)
       railties (~> 3.2.0)
@@ -42,6 +47,7 @@ GEM
       execjs
     coffee-script-source (1.4.0)
     curb (0.7.18)
+    debug_inspector (0.0.2)
     erubis (2.7.0)
     execjs (1.4.0)
       multi_json (~> 1.0)
@@ -81,16 +87,10 @@ GEM
       i18n (>= 0.4.0)
       mime-types (~> 1.16)
       treetop (~> 1.4.8)
+    meta_request (0.2.1)
+      rack-contrib
+      rails
     mime-types (1.21)
-    mm-multi-parameter-attributes (0.2.2)
-      mongo_mapper (>= 0.9.0)
-      tzinfo
-    mongo (1.8.2)
-      bson (~> 1.8.2)
-    mongo_mapper (0.12.0)
-      activemodel (~> 3.0)
-      activesupport (~> 3.0)
-      plucky (~> 0.5.2)
     multi_json (1.6.1)
     multipart-post (1.1.5)
     nokogiri (1.4.7)
@@ -101,12 +101,13 @@ GEM
       jwt (~> 0.1.4)
       multi_json (~> 1.0)
       rack (~> 1.2)
-    plucky (0.5.2)
-      mongo (~> 1.5)
+    pg (0.14.1)
     polyglot (0.3.3)
     rack (1.4.5)
     rack-cache (1.2)
       rack (>= 0.4)
+    rack-contrib (1.1.0)
+      rack (>= 0.9.1)
     rack-ssl (1.3.3)
       rack
     rack-test (0.6.2)
@@ -160,14 +161,16 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
-  bson_ext
+  activerecord-postgresql-adapter
+  better_errors
+  binding_of_caller
   coffee-rails (~> 3.2.1)
   feedzirra
   haml-rails
   htmlentities
   jquery-rails
-  mm-multi-parameter-attributes
-  mongo_mapper
+  meta_request
+  pg
   rails (= 3.2.12)
   sass-rails (~> 3.2.3)
   sorcery
diff --git a/app/assets/javascripts/layers.js.coffee b/app/assets/javascripts/layers.js.coffee
new file mode 100644
index 0000000..7615679
--- /dev/null
+++ b/app/assets/javascripts/layers.js.coffee
@@ -0,0 +1,3 @@
+# Place all the behaviors and hooks related to the matching controller here.
+# All this logic will automatically be available in application.js.
+# You can use CoffeeScript in this file: http://jashkenas.github.com/coffee-script/
diff --git a/app/assets/stylesheets/layers.css.scss b/app/assets/stylesheets/layers.css.scss
new file mode 100644
index 0000000..3a0518b
--- /dev/null
+++ b/app/assets/stylesheets/layers.css.scss
@@ -0,0 +1,3 @@
+// Place all the styles related to the Layers controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/
diff --git a/app/controllers/feeds_controller.rb b/app/controllers/feeds_controller.rb
index 77573f6..28cf6fc 100644
--- a/app/controllers/feeds_controller.rb
+++ b/app/controllers/feeds_controller.rb
@@ -17,8 +17,8 @@ class FeedsController < ApplicationController
   # GET /feeds/1.json
   def show
     @feed = Feed.find(params[:id])
-    @posts = @feed.posts.sort(:published.desc).paginate(:page => params[:page], :per_page => 20)
-
+    @posts = @feed.posts.order("published desc").paginate(:page => params[:page], :per_page => 20)
+    
     respond_to do |format|
       format.html # show.html.erb
       format.json { render json: @feed }
@@ -44,11 +44,27 @@ class FeedsController < ApplicationController
   # POST /feeds
   # POST /feeds.json
   def create
-    @feed = Feed.new(params[:feed])
+    
+
+    Rails.logger.debug "Feed URL: %s" % params['feed']['feed_url']
+
+    if Feed.where(:feed_url => params['feed']['feed_url']).size == 1 # ensure this test returns the values we expect
+      Rails.logger.debug "Adding existing feed to a new layer"
+      @feed = Feed.where(:feed_url => params['feed']['feed_url']).first
+      @layer = Layer.find(params['feed']['new_layer_id']) # assumes that the specified layer exists
+      # Attach the existing feed to the specified layer (making sure we only add each one once)
+      @feed.layers << @layer unless @feed.layers.include?(@layer)
+    else
+      # Create a new feed
+      Rails.logger.debug "Creating a new feed"
+      @feed = Feed.new(params[:feed])
+      @layer = Layer.find(params['feed']['new_layer_id']) # assumes that the specified layer exists
+      @feed.layers << @layer unless @feed.layers.include?(@layer)
+    end
 
     respond_to do |format|
       if @feed.save
-        format.html { redirect_to '/', notice: 'Feed added OK' }
+        format.html { redirect_to @layer, notice: 'Feed added OK' }
         format.json { render json: @feed, status: :created, location: @feed }
       else
         format.html { render action: "new" }
@@ -87,12 +103,12 @@ class FeedsController < ApplicationController
   
   def fetch
     @feed = Feed.find(params[:id])
-    @feed.get
+    @feed.fetch
     redirect_to :back, notice: 'Feed fetched OK'
   end
   
   def fetch_all
-    Feed.get_all
+    Feed.fetch_all
     redirect_to :back, notice: 'All feeds fetched OK'
   end
 end
diff --git a/app/controllers/layers_controller.rb b/app/controllers/layers_controller.rb
new file mode 100644
index 0000000..b69537d
--- /dev/null
+++ b/app/controllers/layers_controller.rb
@@ -0,0 +1,85 @@
+class LayersController < ApplicationController
+  # GET /layers
+  # GET /layers.json
+  def index
+    @layers = Layer.all
+
+    respond_to do |format|
+      format.html # index.html.erb
+      format.json { render json: @layers }
+    end
+  end
+
+  # GET /layers/1
+  # GET /layers/1.json
+  def show
+    @layer = Layer.find(params[:id])
+    @feed = Feed.new
+    @feed.new_layer_id = @layer.id
+
+    respond_to do |format|
+      format.html # show.html.erb
+      format.json { render json: @layer }
+    end
+  end
+
+  # GET /layers/new
+  # GET /layers/new.json
+  def new
+    @layer = Layer.new
+
+    respond_to do |format|
+      format.html # new.html.erb
+      format.json { render json: @layer }
+    end
+  end
+
+  # GET /layers/1/edit
+  def edit
+    @layer = Layer.find(params[:id])
+  end
+
+  # POST /layers
+  # POST /layers.json
+  def create
+    @layer = Layer.new(params[:layer])
+
+    respond_to do |format|
+      if @layer.save
+        format.html { redirect_to @layer, notice: 'Layer was successfully created.' }
+        format.json { render json: @layer, status: :created, location: @layer }
+      else
+        format.html { render action: "new" }
+        format.json { render json: @layer.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PUT /layers/1
+  # PUT /layers/1.json
+  def update
+    @layer = Layer.find(params[:id])
+
+    respond_to do |format|
+      if @layer.update_attributes(params[:layer])
+        format.html { redirect_to @layer, notice: 'Layer was successfully updated.' }
+        format.json { head :no_content }
+      else
+        format.html { render action: "edit" }
+        format.json { render json: @layer.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /layers/1
+  # DELETE /layers/1.json
+  def destroy
+    @layer = Layer.find(params[:id])
+    @layer.destroy
+
+    respond_to do |format|
+      format.html { redirect_to layers_url }
+      format.json { head :no_content }
+    end
+  end
+end
diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index c0c12fb..d53db30 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -2,13 +2,13 @@ class PostsController < ApplicationController
   include PostsHelper
   
   def near
-    @posts = Post.near(params[:lat].to_f, params[:lon].to_f, params[:radius].to_f)
+    @posts = Post.near(params[:lat].to_f, params[:lon].to_f, params[:radius].to_f, params[:layer_id])
 
-    ErrorLog.create(
-      :ts => Time.now,
-      :params => params,
-      :pois_returned => @posts.size
-    )
+#     ErrorLog.create(
+#       :ts => Time.now,
+#       :params => params,
+#       :pois_returned => @posts.size
+#     )
 
     layar_response = {
       :layer =>         'hyparlocal',
diff --git a/app/helpers/layers_helper.rb b/app/helpers/layers_helper.rb
new file mode 100644
index 0000000..b8dbc16
--- /dev/null
+++ b/app/helpers/layers_helper.rb
@@ -0,0 +1,2 @@
+module LayersHelper
+end
diff --git a/app/helpers/posts_helper.rb b/app/helpers/posts_helper.rb
index 8325f46..3e77a72 100644
--- a/app/helpers/posts_helper.rb
+++ b/app/helpers/posts_helper.rb
@@ -6,15 +6,15 @@ module PostsHelper
       :imageURL => "%s%s/assets/layar-icons/tal-logo-100.png" % [ request.protocol, request.env['HTTP_HOST'] ],
       :anchor =>  {
         :geolocation => {
-          :lat => post.loc['lat'],
-          :lon => post.loc['lng'],
+          :lat => post.lat,
+          :lon => post.lon,
           :alt => 0
         }
       },
       :text => {
         :title =>       decode_entities(post.title),
         :description => clean_description(post.summary),
-        :footnote =>    "From #{post.feed.title}"
+        :footnote =>    "From #{post.feed_title}"
       },
       :actions => [
         {
diff --git a/app/models/feed.rb b/app/models/feed.rb
index 2838749..e07fc45 100644
--- a/app/models/feed.rb
+++ b/app/models/feed.rb
@@ -1,57 +1,45 @@
-class Feed
-  include MongoMapper::Document
+class Feed < ActiveRecord::Base
+  has_many :posts, :dependent => :destroy
+  has_and_belongs_to_many :layers
+  attr_accessible :title, :url, :description, :generator, :last_fetched, :feed_url
+  attr_accessor :new_layer_id # non model attribute used when creating new feeds from within a layer
 
-  key :title,         String, :default => "[New feed - hasn't been fetched yet]"
-  key :feed_url,      String  # The URL of the RSS feed, not the website that owns it
-  key :url,           String  # The URL of website. Called "link" in RSS 2.0
-  key :description,   String
-  key :guid,          String # Atom id or RSS guid
-  key :generator,     String
-  key :last_fetched,  Time, :default => nil
-  timestamps!
-  
-  ensure_index :title
-
-  many :posts, :dependent => :destroy
-
-  validates :title, :presence => true
   validates_format_of :feed_url, :with => URI::regexp(%w(http https)), :message => "must be a valid URL"
   
-  after_create  :get
+  after_create  :fetch
   
-  # Fetch and parse feed contents from web
-
-  def self.get_all
-    Feed.all.each { |f| f.get }
+  def self.fetch_all
+    Feed.all.each { |f| f.fetch }
   end
 
-  def get
-    puts "Fetching feed: #{@url}"
+  # Fetch and parse feed contents from web
+  def fetch
+    puts "Fetching feed: #{self.feed_url}"
     Feedzirra::Feed.add_common_feed_entry_element('georss:point', :as => :point)
     Feedzirra::Feed.add_common_feed_entry_element('geo:lat', :as => :geo_lat)
     Feedzirra::Feed.add_common_feed_entry_element('geo:long', :as => :geo_long)
     Feedzirra::Feed.add_common_feed_element('generator', :as => :generator)
 
-    feed = Feedzirra::Feed.fetch_and_parse(@feed_url)
+    feed = Feedzirra::Feed.fetch_and_parse(self.feed_url)
 
-    self.set(
+    self.update_attributes(
       :title =>         feed.title,
       :url =>           feed.url,
       :description =>   feed.description,
       :generator =>     feed.generator,
-      :last_fetched =>  Time.now
+      :last_fetched =>  DateTime.now
     )
 
     feed.entries.each do |e|
     
       if e.geo_lat && e.geo_long
-        latlng = [e.geo_lat, e.geo_long]
+        latlon = [e.geo_lat, e.geo_long]
       elsif e.point
-        latlng = e.point.split(' ')
+        latlon = e.point.split(' ')
       else
         next
-      end      
-
+      end
+      
       attrs = {
         :title =>     e.title,
         :url =>       e.url,
@@ -60,20 +48,15 @@ class Feed
         :content =>   e.content,
         :published => e.published,
         :guid =>      e.id,
-        :loc => {
-          :lng => latlng[1].to_f,
-          :lat => latlng[0].to_f
-        }
+        :lon =>       latlon[1].to_f,
+        :lat =>       latlon[0].to_f
       }
       
-      if Post.where(:url => e.url).size == 0
-        self.posts << Post.create(attrs)
-      else
-        Post.set({:url => e.url}, attrs)
-      end
-      
+      # Create a new post or update an existing one
+      post = Post.find_or_initialize_by_url(e.url)
+      post.feed = self
+      post.assign_attributes(attrs)
+      post.save
     end
-    
   end
-  
 end
diff --git a/app/models/layer.rb b/app/models/layer.rb
new file mode 100644
index 0000000..86d2ff0
--- /dev/null
+++ b/app/models/layer.rb
@@ -0,0 +1,4 @@
+class Layer < ActiveRecord::Base
+  attr_accessible :name
+  has_and_belongs_to_many :feeds
+end
diff --git a/app/models/post.rb b/app/models/post.rb
index 3841336..598edf4 100644
--- a/app/models/post.rb
+++ b/app/models/post.rb
@@ -1,26 +1,70 @@
-class Post
-  include MongoMapper::Document
-
-  key :title,       String
-  key :url,         String
-  key :author,      String
-  key :summary,     String
-  key :content,     String
-  key :published,   Time
-  key :loc,         Hash # { lng, lat }
-  timestamps!
-
-  ensure_index [[:loc, '2d']]
-
+class Post < ActiveRecord::Base
   belongs_to :feed
   
-  EARTH_RADIUS_M = 6378000
+  EARTH_RADIUS_METRES = 6378000
   
-  def self.near(lat, lng, radius_m)
-    all(
-      :loc => {
-        '$nearSphere' => [ lng, lat ],
-        '$maxDistance' => radius_m / EARTH_RADIUS_M
-    })
+  def self.near(lat, lon, radius_metres, layer_id)
+    # Santize inputs. Is this necessary?
+    lat = lat.to_f
+    lon = lon.to_f
+    radius_metres = radius_metres.to_i
+    layer_id = layer_id.to_i
+
+    # Calculate distance using the Haversine formula  
+    self.find_by_sql(<<-ENDQUERY
+      SELECT
+        p.id,
+        p.title,
+        p.summary,
+        p.url,
+        p.lat,
+        p.lon,
+        p.published,
+        f.title as feed_title,
+        ( #{EARTH_RADIUS_METRES}
+        * acos( cos( radians('#{lat}') )
+        * cos( radians( p.lat ) )
+        * cos( radians( p.lon )
+        - radians('#{lon}') )
+        + sin( radians('#{lat}') )
+        * sin( radians( p.lat ) ) ) )
+        As distance
+
+      FROM posts p
+      INNER JOIN feeds f
+      ON p.feed_id = f.id
+      
+      WHERE
+        p.id IN
+        ( -- Subquery returns a list of post_ids for posts on this layer
+          SELECT p.id
+
+          FROM feeds_layers fl
+          
+          INNER JOIN feeds f
+          ON fl.feed_id = f.id
+
+          INNER JOIN posts p
+          ON p.feed_id = f.id
+
+          WHERE fl.layer_id = #{layer_id}
+        )
+          
+        AND
+        (
+          #{EARTH_RADIUS_METRES}
+          * acos( cos( radians('#{lat}') )
+          * cos( radians( p.lat ) )
+          * cos( radians( p.lon )
+          - radians('#{lon}') )
+          + sin( radians('#{lat}') )
+          * sin( radians( p.lat ) ) )
+        )
+        <= #{radius_metres}
+        
+      ORDER BY distance
+
+      ENDQUERY
+    )
   end
 end
diff --git a/app/models/user.rb b/app/models/user.rb
index 4eeb5b4..1afe6a4 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -1,11 +1,4 @@
-class User
-  include MongoMapper::Document
-
-  key :email, String
-  key :crypted_password, String
-  key :salt, String
-  timestamps!
-  
+class User < ActiveRecord::Base
   authenticates_with_sorcery!
 #   attr_accessible :email, :password, :password_confirmation
 
@@ -14,5 +7,4 @@ class User
   validates_uniqueness_of :email
   validates_length_of :password, :minimum => 3, :message => "password must be at least 3 characters long", :if => :password
   validates_confirmation_of :password, :message => "should match confirmation", :if => :password
-
 end
diff --git a/app/views/feeds/_form.html.haml b/app/views/feeds/_form.html.haml
index 70a4b73..60e59dc 100644
--- a/app/views/feeds/_form.html.haml
+++ b/app/views/feeds/_form.html.haml
@@ -15,6 +15,7 @@
   .field
     = f.label "URL"
     = f.text_field :feed_url, :size => 120
+    = f.hidden_field :new_layer_id, :value => @feed.new_layer_id
     = f.submit 'Save', :id => 'submit'
   -#
     .field
diff --git a/app/views/feeds/show.html.haml b/app/views/feeds/show.html.haml
index fe65166..4863bc5 100644
--- a/app/views/feeds/show.html.haml
+++ b/app/views/feeds/show.html.haml
@@ -28,7 +28,7 @@
   - @posts.each do |p|
     %tr
       %td= link_to p.title, p.url
-      %td= link_to "Map", "https://maps.google.co.uk/maps?q=%s,%s&hl=en&z=18" % [ p.loc['lat'], p.loc['lng'] ], :target => "_blank"
+      %td= link_to "Map", "https://maps.google.co.uk/maps?q=%s,%s&hl=en&z=18" % [ p.lat, p.lon ], :target => "_blank"
       %td
         - unless p.published.nil?
           = p.published.strftime("%d %b %Y %H:%M")
diff --git a/app/views/layers/_form.html.haml b/app/views/layers/_form.html.haml
new file mode 100644
index 0000000..27bc898
--- /dev/null
+++ b/app/views/layers/_form.html.haml
@@ -0,0 +1,13 @@
+= form_for @layer do |f|
+  - if @layer.errors.any?
+    #error_explanation
+      %h2= "#{pluralize(@layer.errors.count, "error")} prohibited this layer from being saved:"
+      %ul
+        - @layer.errors.full_messages.each do |msg|
+          %li= msg
+
+  .field
+    = f.label :name
+    = f.text_field :name
+  .actions
+    = f.submit 'Save'
diff --git a/app/views/layers/edit.html.haml b/app/views/layers/edit.html.haml
new file mode 100644
index 0000000..9c013b7
--- /dev/null
+++ b/app/views/layers/edit.html.haml
@@ -0,0 +1,7 @@
+%h1 Editing layer
+
+= render 'form'
+
+= link_to 'Show', @layer
+\|
+= link_to 'Back', layers_path
diff --git a/app/views/layers/index.html.haml b/app/views/layers/index.html.haml
new file mode 100644
index 0000000..1b773c5
--- /dev/null
+++ b/app/views/layers/index.html.haml
@@ -0,0 +1,10 @@
+%h1 Layers
+
+= link_to 'New Layer', new_layer_path, :class => 'button'
+
+%table
+  - @layers.each do |layer|
+    %tr
+      %td= link_to layer.name, layer
+      %td= link_to 'Edit', edit_layer_path(layer)
+      %td= link_to 'Delete', layer, :method => :delete, :data => { :confirm => 'Are you sure?' }
diff --git a/app/views/layers/new.html.haml b/app/views/layers/new.html.haml
new file mode 100644
index 0000000..73ddc96
--- /dev/null
+++ b/app/views/layers/new.html.haml
@@ -0,0 +1,5 @@
+%h1 New layer
+
+= render 'form'
+
+= link_to 'Back', layers_path
diff --git a/app/views/layers/show.html.haml b/app/views/layers/show.html.haml
new file mode 100644
index 0000000..546aaeb
--- /dev/null
+++ b/app/views/layers/show.html.haml
@@ -0,0 +1,51 @@
+%h1
+  Layer: 
+  = @layer.name
+
+%p
+  API URL:
+  = "#{request.protocol}#{request.host_with_port}/posts/near.json?layer_id=#{@layer.id}"
+  
+
+%h2 Feeds
+
+#new_feed
+  = render 'feeds/form'
+
+%p= link_to "Fetch all", :fetch_all, :class => "button"
+
+%table
+  %tr
+    %th
+    %th Posts
+    %th Fetched
+    %th
+    %th
+    %th
+
+  - @layer.feeds.each do |f|
+    %tr
+      %td
+        .feed_title
+          = link_to f.title, f
+      %td.right= f.posts.count
+      %td
+        - if f.last_fetched.nil?
+          never
+        - else
+          = (time_ago_in_words(f.last_fetched) + " ago").gsub(/ +/, "&nbsp;").html_safe
+      %td= link_to "Fetch", fetch_feed_url(f), :class => "button"
+      %td= link_to 'Edit', edit_feed_path(f), :class => "button"
+      %td= link_to 'Delete', f, :confirm => "Delete #{f.title} and all its posts?", :method => :delete, :class => "button"
+
+  %tr
+    %td
+    %td.right [number of posts in this layer]
+    %td
+    %td
+    %td
+    %td
+
+= link_to 'Edit', edit_layer_path(@layer)
+\|
+= link_to 'Back', layers_path
diff --git a/app/views/posts/near.html.haml b/app/views/posts/near.html.haml
index 3a14668..f967592 100644
--- a/app/views/posts/near.html.haml
+++ b/app/views/posts/near.html.haml
@@ -1,11 +1,20 @@
 %h1 Posts#near
 
 %table
+  %thead
+    %tr
+      %th
+      %th Latitude
+      %th Longitude
+      %th Distance (metres)
+      %th Published
+  %tbody
   - @posts.each do |p|
     %tr
       %td= link_to p.title, p.url
-      %td= p.loc['lat']
-      %td= p.loc['lng']
+      %td= p.lat
+      %td= p.lon
+      %td= p.distance.to_i
       %td
         - unless p.published.nil?
           = p.published.strftime("%d %b %Y %H:%M")
diff --git a/config/application.rb b/config/application.rb
index 426326e..57fa486 100644
--- a/config/application.rb
+++ b/config/application.rb
@@ -1,12 +1,13 @@
 require File.expand_path('../boot', __FILE__)
 
 # Pick the frameworks you want:
+require 'rails/all'
 # require "active_record/railtie"
-require "action_controller/railtie"
-require "action_mailer/railtie"
-require "active_resource/railtie"
-require "sprockets/railtie"
-require "rails/test_unit/railtie"
+# require "action_controller/railtie"
+# require "action_mailer/railtie"
+# require "active_resource/railtie"
+# require "sprockets/railtie"
+# require "rails/test_unit/railtie"
 
 if defined?(Bundler)
   # If you precompile assets before deploying to production, use this line
@@ -15,7 +16,6 @@ if defined?(Bundler)
   # Bundler.require(:default, :assets, Rails.env)
 end
 
-
 module Apollo
   class Application < Rails::Application
     config.action_mailer.default_url_options = { :host => ENV['APOLLO_HOSTNAME'] }
@@ -72,10 +72,7 @@ module Apollo
     # http://mongomapper.com/documentation/getting-started/rails.html
     config.generators do |g|
       g.template_engine :haml
-      g.orm :mongo_mapper
     end
-    
-    MongoMapper::Document.plugin(MongoMapper::Plugins::MultiParameterAttributes)
 #     Time.zone = 'London'
   end
 end
diff --git a/config/database.yml b/config/database.yml
new file mode 100644
index 0000000..4904f45
--- /dev/null
+++ b/config/database.yml
@@ -0,0 +1,26 @@
+development:
+  adapter: postgresql
+  encoding: unicode
+  database: apollo_development
+  pool: 5
+  username: postgres
+  password:
+  port: 5433
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test:
+  adapter: postgresql
+  encoding: unicode
+  database: apollo_test
+  pool: 5
+  username: postgres
+  password: 
+  port: 5433
+
+production:
+  adapter: sqlite3
+  database: db/production.sqlite3
+  pool: 5
+  timeout: 5000
diff --git a/config/mongo.yml b/config/mongo.yml
deleted file mode 100644
index 5f11e48..0000000
--- a/config/mongo.yml
+++ /dev/null
@@ -1,15 +0,0 @@
-defaults: &defaults
-  host: 127.0.0.1
-  port: 27017
-
-development:
-  <<: *defaults
-  database: apollo_development
-
-test:
-  <<: *defaults
-  database: apollo_test
-
-# set these environment variables on your prod server
-production:
-  uri: <%= ENV['MONGOLAB_URI'] %>
diff --git a/config/routes.rb b/config/routes.rb
index 6cbea69..81b3caa 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -2,6 +2,7 @@ Apollo::Application.routes.draw do
   get "logout" => "sessions#destroy", :as => "logout"
   get "login" => "sessions#new", :as => "login"
 
+  resources :layers
   resources :users
   resources :sessions
   resources :password_resets
@@ -65,7 +66,7 @@ Apollo::Application.routes.draw do
 
   # You can have the root of your site routed with "root"
   # just remember to delete public/index.html.
-  root :to => 'feeds#index'
+  root :to => 'layers#index'
 
   # See how all your routes lay out with "rake routes"
 
diff --git a/db/migrate/20130222112030_sorcery_core.rb b/db/migrate/20130222112030_sorcery_core.rb
new file mode 100644
index 0000000..24956fe
--- /dev/null
+++ b/db/migrate/20130222112030_sorcery_core.rb
@@ -0,0 +1,16 @@
+class SorceryCore < ActiveRecord::Migration
+  def self.up
+    create_table :users do |t|
+      t.string :username,         :null => false  # if you use another field as a username, for example email, you can safely remove this field.
+      t.string :email,            :default => nil # if you use this field as a username, you might want to make it :null => false.
+      t.string :crypted_password, :default => nil
+      t.string :salt,             :default => nil
+
+      t.timestamps
+    end
+  end
+
+  def self.down
+    drop_table :users
+  end
+end
\ No newline at end of file
diff --git a/db/migrate/20130222120002_remove_user_username.rb b/db/migrate/20130222120002_remove_user_username.rb
new file mode 100644
index 0000000..4bf89bd
--- /dev/null
+++ b/db/migrate/20130222120002_remove_user_username.rb
@@ -0,0 +1,9 @@
+class RemoveUserUsername < ActiveRecord::Migration
+  def up
+    remove_column :users, :username
+  end
+
+  def down
+    add_column :users, :username, :string, :null => false
+  end
+end
diff --git a/db/migrate/20130222123224_add_guid_to_posts_remove_guid_from_feeds.rb b/db/migrate/20130222123224_add_guid_to_posts_remove_guid_from_feeds.rb
new file mode 100644
index 0000000..d2a4d35
--- /dev/null
+++ b/db/migrate/20130222123224_add_guid_to_posts_remove_guid_from_feeds.rb
@@ -0,0 +1,6 @@
+class AddGuidToPostsRemoveGuidFromFeeds < ActiveRecord::Migration
+  def change
+    remove_column :feeds, :guid
+    add_column :posts, :guid, :string
+  end
+end
diff --git a/db/migrate/20130222123833_feeds_change_last_fetched_to_datetime.rb b/db/migrate/20130222123833_feeds_change_last_fetched_to_datetime.rb
new file mode 100644
index 0000000..22aabf0
--- /dev/null
+++ b/db/migrate/20130222123833_feeds_change_last_fetched_to_datetime.rb
@@ -0,0 +1,11 @@
+class FeedsChangeLastFetchedToDatetime < ActiveRecord::Migration
+  def up
+    remove_column :feeds, :last_fetched
+    add_column :feeds, :last_fetched, :datetime
+  end
+
+  def down
+    remove_column :feeds, :last_fetched
+    add_column :feeds, :last_fetched, :time
+  end
+end
diff --git a/db/migrate/20130222125833_post_published_change_to_datetime.rb b/db/migrate/20130222125833_post_published_change_to_datetime.rb
new file mode 100644
index 0000000..3e27fbf
--- /dev/null
+++ b/db/migrate/20130222125833_post_published_change_to_datetime.rb
@@ -0,0 +1,11 @@
+class PostPublishedChangeToDatetime < ActiveRecord::Migration
+  def up
+    remove_column :posts, :published
+    add_column :posts, :published, :datetime
+  end
+
+  def down
+    remove_column :posts, :published
+    add_column :posts, :published, :time
+  end
+end
diff --git a/db/migrate/20130228150425_create_layers.rb b/db/migrate/20130228150425_create_layers.rb
new file mode 100644
index 0000000..4ad96d7
--- /dev/null
+++ b/db/migrate/20130228150425_create_layers.rb
@@ -0,0 +1,15 @@
+class CreateLayers < ActiveRecord::Migration
+  def change
+    create_table :layers do |t|
+      t.string :name
+      t.timestamps
+    end
+
+    create_table :feeds_layers, :id => false do |t|
+    	t.integer :feed_id
+    	t.integer :layer_id
+   	end
+
+   	add_index :feeds_layers, [ :feed_id, :layer_id ]
+  end
+end
diff --git a/db/schema.rb b/db/schema.rb
new file mode 100644
index 0000000..f6c1318
--- /dev/null
+++ b/db/schema.rb
@@ -0,0 +1,63 @@
+# encoding: UTF-8
+# This file is auto-generated from the current state of the database. Instead
+# of editing this file, please use the migrations feature of Active Record to
+# incrementally modify your database, and then regenerate this schema definition.
+#
+# Note that this schema.rb definition is the authoritative source for your
+# database schema. If you need to create the application database on another
+# system, you should be using db:schema:load, not running all the migrations
+# from scratch. The latter is a flawed and unsustainable approach (the more migrations
+# you'll amass, the slower it'll run and the greater likelihood for issues).
+#
+# It's strongly recommended to check this file into your version control system.
+
+ActiveRecord::Schema.define(:version => 20130228150425) do
+
+  create_table "feeds", :force => true do |t|
+    t.string   "title"
+    t.string   "feed_url"
+    t.string   "url"
+    t.string   "description"
+    t.string   "generator"
+    t.datetime "created_at",   :null => false
+    t.datetime "updated_at",   :null => false
+    t.datetime "last_fetched"
+  end
+
+  create_table "feeds_layers", :id => false, :force => true do |t|
+    t.integer "feed_id"
+    t.integer "layer_id"
+  end
+
+  add_index "feeds_layers", ["feed_id", "layer_id"], :name => "index_feeds_layers_on_feed_id_and_layer_id"
+
+  create_table "layers", :force => true do |t|
+    t.string   "name"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+  end
+
+  create_table "posts", :force => true do |t|
+    t.string   "title"
+    t.string   "url"
+    t.string   "author"
+    t.text     "summary"
+    t.text     "content"
+    t.decimal  "lat"
+    t.decimal  "lon"
+    t.integer  "feed_id"
+    t.datetime "created_at", :null => false
+    t.datetime "updated_at", :null => false
+    t.string   "guid"
+    t.datetime "published"
+  end
+
+  create_table "users", :force => true do |t|
+    t.string   "email"
+    t.string   "crypted_password"
+    t.string   "salt"
+    t.datetime "created_at",       :null => false
+    t.datetime "updated_at",       :null => false
+  end
+
+end
diff --git a/test/fixtures/layers.yml b/test/fixtures/layers.yml
new file mode 100644
index 0000000..0227c60
--- /dev/null
+++ b/test/fixtures/layers.yml
@@ -0,0 +1,7 @@
+# Read about fixtures at http://api.rubyonrails.org/classes/ActiveRecord/Fixtures.html
+
+one:
+  name: MyString
+
+two:
+  name: MyString
diff --git a/test/functional/layers_controller_test.rb b/test/functional/layers_controller_test.rb
new file mode 100644
index 0000000..d6dc765
--- /dev/null
+++ b/test/functional/layers_controller_test.rb
@@ -0,0 +1,49 @@
+require 'test_helper'
+
+class LayersControllerTest < ActionController::TestCase
+  setup do
+    @layer = layers(:one)
+  end
+
+  test "should get index" do
+    get :index
+    assert_response :success
+    assert_not_nil assigns(:layers)
+  end
+
+  test "should get new" do
+    get :new
+    assert_response :success
+  end
+
+  test "should create layer" do
+    assert_difference('Layer.count') do
+      post :create, layer: { name: @layer.name }
+    end
+
+    assert_redirected_to layer_path(assigns(:layer))
+  end
+
+  test "should show layer" do
+    get :show, id: @layer
+    assert_response :success
+  end
+
+  test "should get edit" do
+    get :edit, id: @layer
+    assert_response :success
+  end
+
+  test "should update layer" do
+    put :update, id: @layer, layer: { name: @layer.name }
+    assert_redirected_to layer_path(assigns(:layer))
+  end
+
+  test "should destroy layer" do
+    assert_difference('Layer.count', -1) do
+      delete :destroy, id: @layer
+    end
+
+    assert_redirected_to layers_path
+  end
+end
diff --git a/test/unit/helpers/layers_helper_test.rb b/test/unit/helpers/layers_helper_test.rb
new file mode 100644
index 0000000..ad81667
--- /dev/null
+++ b/test/unit/helpers/layers_helper_test.rb
@@ -0,0 +1,4 @@
+require 'test_helper'
+
+class LayersHelperTest < ActionView::TestCase
+end
diff --git a/test/unit/layer_test.rb b/test/unit/layer_test.rb
new file mode 100644
index 0000000..29c3aa3
--- /dev/null
+++ b/test/unit/layer_test.rb
@@ -0,0 +1,7 @@
+require 'test_helper'
+
+class LayerTest < ActiveSupport::TestCase
+  # test "the truth" do
+  #   assert true
+  # end
+end