added ability save and show point on the google map

Gemfile

@@ -22,6 +22,8 @@ group :assets do
 end
 
 gem 'jquery-rails'
+gem 'rgeo'
+gem 'activerecord-postgis-adapter'
 
 # To use ActiveModel has_secure_password
 # gem 'bcrypt-ruby', '~> 3.0.0'

Gemfile.lock

@@ -22,6 +22,9 @@ GEM
       activesupport (= 3.2.3)
       arel (~> 3.0.2)
       tzinfo (~> 0.3.29)
+    activerecord-postgis-adapter (0.4.3)
+      pg (>= 0.11.0)
+      rgeo-activerecord (~> 0.4.5)
     activeresource (3.2.3)
       activemodel (= 3.2.3)
       activesupport (= 3.2.3)
@@ -80,6 +83,11 @@ GEM
     rake (0.9.2.2)
     rdoc (3.12)
       json (~> 1.4)
+    rgeo (0.3.15)
+    rgeo-activerecord (0.4.5)
+      activerecord (>= 3.0.3)
+      arel (>= 2.0.6)
+      rgeo (>= 0.3.10)
     sass (3.1.20)
     sass-rails (3.2.5)
       railties (~> 3.2.0)
@@ -103,10 +111,12 @@ PLATFORMS
   ruby
 
 DEPENDENCIES
+  activerecord-postgis-adapter
   coffee-rails (~> 3.2.1)
   jquery-rails
   json
   pg
   rails (= 3.2.3)
+  rgeo
   sass-rails (~> 3.2.3)
   uglifier (>= 1.0.3)

app/assets/javascripts/application.js

@@ -13,3 +13,17 @@
 //= require jquery
 //= require jquery_ujs
 //= require_tree .
+
+
+function findMe() {
+    if(navigator.geolocation) {
+        navigator.geolocation.getCurrentPosition(function(position) {
+            document.getElementById('checkin_latitude').value = position.coords.latitude;
+            document.getElementById('checkin_longitude').value = position.coords.longitude;
+        }, function() {
+            alert('We couldn\'t find your position.');
+        });
+    } else {
+        alert('Your browser doesn\'t support geolocation.');
+    }
+}

app/assets/javascripts/checkins.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/

app/assets/stylesheets/checkins.css.scss

@@ -0,0 +1,3 @@
+// Place all the styles related to the checkins controller here.
+// They will automatically be included in application.css.
+// You can use Sass (SCSS) here: http://sass-lang.com/

app/assets/stylesheets/scaffolds.css.scss

@@ -0,0 +1,56 @@
+body {
+  background-color: #fff;
+  color: #333;
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px; }
+
+p, ol, ul, td {
+  font-family: verdana, arial, helvetica, sans-serif;
+  font-size: 13px;
+  line-height: 18px; }
+
+pre {
+  background-color: #eee;
+  padding: 10px;
+  font-size: 11px; }
+
+a {
+  color: #000;
+  &:visited {
+    color: #666; }
+  &:hover {
+    color: #fff;
+    background-color: #000; } }
+
+div {
+  &.field, &.actions {
+    margin-bottom: 10px; } }
+
+#notice {
+  color: green; }
+
+.field_with_errors {
+  padding: 2px;
+  background-color: red;
+  display: table; }
+
+#error_explanation {
+  width: 450px;
+  border: 2px solid red;
+  padding: 7px;
+  padding-bottom: 0;
+  margin-bottom: 20px;
+  background-color: #f0f0f0;
+  h2 {
+    text-align: left;
+    font-weight: bold;
+    padding: 5px 5px 5px 15px;
+    font-size: 12px;
+    margin: -7px;
+    margin-bottom: 0px;
+    background-color: #c00;
+    color: #fff; }
+  ul li {
+    font-size: 12px;
+    list-style: square; } }

app/controllers/checkins_controller.rb

@@ -0,0 +1,90 @@
+class CheckinsController < ApplicationController
+  # GET /checkins
+  # GET /checkins.json
+  def index
+    @checkins = Checkin.all
+
+    respond_to do |format|
+      format.html # index.html.erb
+      format.json { render json: @checkins }
+    end
+  end
+
+  # GET /checkins/1
+  # GET /checkins/1.json
+  def show
+    @checkin = Checkin.find(params[:id])
+
+    @nearby_checkins = Checkin.nearby_to(@checkin, 1000)
+
+    respond_to do |format|
+      format.html # show.html.erb
+      format.json { render json: @checkin }
+    end
+  end
+
+  # GET /checkins/new
+  # GET /checkins/new.json
+  def new
+    @checkin = Checkin.new
+
+    respond_to do |format|
+      format.html # new.html.erb
+      format.json { render json: @checkin }
+    end
+  end
+
+  # GET /checkins/1/edit
+  def edit
+    @checkin = Checkin.find(params[:id])
+  end
+
+  # POST /checkins
+  # POST /checkins.json
+  def create
+    @checkin = Checkin.new(params[:checkin])
+
+    if @checkin.valid?
+      puts '---controller'
+      puts @checkin.inspect
+    end
+
+    respond_to do |format|
+      if @checkin.save
+        format.html { redirect_to @checkin, notice: 'Checkin was successfully created.' }
+        format.json { render json: @checkin, status: :created, location: @checkin }
+      else
+        format.html { render action: "new" }
+        format.json { render json: @checkin.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # PUT /checkins/1
+  # PUT /checkins/1.json
+  def update
+    @checkin = Checkin.find(params[:id])
+
+    respond_to do |format|
+      if @checkin.update_attributes(params[:checkin])
+        format.html { redirect_to @checkin, notice: 'Checkin was successfully updated.' }
+        format.json { head :no_content }
+      else
+        format.html { render action: "edit" }
+        format.json { render json: @checkin.errors, status: :unprocessable_entity }
+      end
+    end
+  end
+
+  # DELETE /checkins/1
+  # DELETE /checkins/1.json
+  def destroy
+    @checkin = Checkin.find(params[:id])
+    @checkin.destroy
+
+    respond_to do |format|
+      format.html { redirect_to checkins_url }
+      format.json { head :no_content }
+    end
+  end
+end

app/helpers/checkins_helper.rb

@@ -0,0 +1,2 @@
+module CheckinsHelper
+end

app/models/checkin.rb

@@ -0,0 +1,24 @@
+class Checkin < ActiveRecord::Base
+  attr_accessible :location, :title, :latitude, :longitude
+
+  scope :nearby_to,
+        lambda { |checkin, max_distance|
+          where("ST_DWithin(location, ?, ?) AND id != ?", checkin.location, max_distance, checkin.id)
+        }
+
+  def latitude
+    self.location.nil? ? 0 : self.location.y
+  end
+
+  def latitude=(value)
+    self.location = "POINT(#{longitude} #{value})"
+  end
+
+  def longitude
+    self.location.nil? ? 0 : self.location.x
+  end
+
+  def longitude=(value)
+    self.location = "POINT(#{value} #{latitude})"
+  end
+end

app/views/checkins/_form.html.erb

@@ -0,0 +1,35 @@
+<%= form_for(@checkin) do |f| %>
+  <% if @checkin.errors.any? %>
+    <div id="error_explanation">
+      <h2><%= pluralize(@checkin.errors.count, "error") %> prohibited this checkin from being saved:</h2>
+
+      <ul>
+        <% @checkin.errors.full_messages.each do |msg| %>
+          <li><%= msg %></li>
+        <% end %>
+      </ul>
+    </div>
+  <% end %>
+
+  <div class="field">
+    <%= f.label :title %>
+    <br/>
+    <%= f.text_field :title %>
+  </div>
+  <div class="field">
+    <%= f.label :latitude %>
+    <br/>
+    <%= f.text_field :latitude %>
+  </div>
+  <div class="field">
+    <%= f.label :longitude %>
+    <br/>
+    <%= f.text_field :longitude %>
+  </div>
+  <div class="actions">
+    <%= f.submit %>
+  </div>
+<% end %>
+
+
+<input type="button" value="Find me!" onclick="findMe();" />

app/views/checkins/edit.html.erb

@@ -0,0 +1,6 @@
+<h1>Editing checkin</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Show', @checkin %> |
+<%= link_to 'Back', checkins_path %>

app/views/checkins/index.html.erb

@@ -0,0 +1,62 @@
+<script type="text/javascript" src="http://maps.googleapis.com/maps/api/js?sensor=false"></script>
+
+<div id="map" style="width: 600px; height: 500px;"></div>
+
+<h1>Listing checkins</h1>
+
+<table>
+  <tr>
+    <th>Title</th>
+    <th>Location</th>
+    <th></th>
+    <th></th>
+    <th></th>
+  </tr>
+
+<% @checkins.each do |checkin| %>
+  <tr>
+    <td><%= checkin.title %></td>
+    <td><%= checkin.location %></td>
+    <td><%= link_to 'Show', checkin %></td>
+    <td><%= link_to 'Edit', edit_checkin_path(checkin) %></td>
+    <td><%= link_to 'Destroy', checkin, confirm: 'Are you sure?', method: :delete %></td>
+  </tr>
+<% end %>
+</table>
+
+<br />
+
+<%= link_to 'New Checkin', new_checkin_path %>
+
+<script type="text/javascript">
+  // Create the map
+  var map = new google.maps.Map(document.getElementById("map"), {
+    mapTypeId: google.maps.MapTypeId.ROADMAP
+  });
+
+  // Initialize the bounds container
+  var bounds = new google.maps.LatLngBounds();
+
+  <% @checkins.each do |checkin| %>
+  // Create the LatLng
+  var latLng = new google.maps.LatLng(<%= checkin.latitude %>, <%= checkin.longitude %>);
+
+  // Create the marker
+  var marker = new google.maps.Marker({
+    position: latLng,
+    map: map,
+    title: '<%= escape_javascript(checkin.title) %>'
+  });
+
+  // Add click event
+  google.maps.event.addListener(marker, 'click', function() {
+    document.location = '<%= checkin_path(checkin) %>';
+  });
+
+  // Extend the bounds
+  bounds.extend(latLng);
+  <% end %>
+
+  // Fit to bounds
+  map.fitBounds(bounds);
+</script>

app/views/checkins/new.html.erb

@@ -0,0 +1,5 @@
+<h1>New checkin</h1>
+
+<%= render 'form' %>
+
+<%= link_to 'Back', checkins_path %>

app/views/checkins/show.html.erb

@@ -0,0 +1,22 @@
+<p id="notice"><%= notice %></p>
+
+<p>
+  <b>Title:</b>
+  <%= @checkin.title %>
+</p>
+
+<p>
+  <b>Location:</b>
+  <%= @checkin.location %>
+</p>
+
+
+<%= link_to 'Edit', edit_checkin_path(@checkin) %> |
+<%= link_to 'Back', checkins_path %>
+
+<h2>Nearby check-ins</h2>
+<ul>
+  <% @nearby_checkins.each do |checkin| %>
+    <li><%= link_to checkin.title, checkin %></li>
+  <% end %>
+</ul>

config/application.rb

@@ -1,6 +1,8 @@
 require File.expand_path('../boot', __FILE__)
 
 require 'rails/all'
+#require 'spatial_adapter/postgresql'
+require 'active_record/connection_adapters/postgis_adapter/railtie'
 
 if defined?(Bundler)
   # If you precompile assets before deploying to production, use this line