cache homepage latest contribution

app/controllers/outfits_controller.rb

@@ -61,8 +61,10 @@ class OutfitsController < ApplicationController
       @newest_items = Item.newest.select([:id, :name, :thumbnail_url]).limit(9)
     end
     
-    @latest_contribution = Contribution.recent.first
-    Contribution.preload_contributeds_and_parents([@latest_contribution])
+    unless fragment_exist?('outfits#new latest_contribution')
+      @latest_contribution = Contribution.recent.first
+      Contribution.preload_contributeds_and_parents([@latest_contribution])
+    end
   end
 
   def show

app/models/contribution_observer.rb

@@ -0,0 +1,11 @@
+class ContributionObserver < ActiveRecord::Observer
+  def after_create(contribution)
+    controller.expire_fragment('outfits#new latest_contribution')
+  end
+
+  private
+  
+  def controller
+    @controller ||= ActionController::Base.new
+  end
+end

app/views/outfits/new.html.haml

@@ -74,17 +74,17 @@
         = pet_name_tag :placeholder => raw('model a pet…')
         = submit_tag 'submit'
 
-#latest-contribution
-  = link_to 'Contributions:', contributions_path, :id => 'recent-contributions-link'
-  = link_to @latest_contribution.user.name, user_contributions_path(@latest_contribution.user)
-  showed us
-  = succeed '.' do
-    = contributed_description @latest_contribution.contributed, false
-  Thanks,
-  = succeed '!' do
+- cache 'outfits#new latest_contribution' do
+  #latest-contribution
+    = link_to 'Contributions:', contributions_path, :id => 'recent-contributions-link'
     = link_to @latest_contribution.user.name, user_contributions_path(@latest_contribution.user)
-  %span#latest-contribution-created-at{:title => @latest_contribution.created_at.to_s}
-    #{time_ago_in_words @latest_contribution.created_at} ago
+    showed us
+    = succeed '.' do
+      = contributed_description @latest_contribution.contributed, false
+    Thanks,
+    = succeed '!' do
+      = link_to @latest_contribution.user.name, user_contributions_path(@latest_contribution.user)
+    %abbr#latest-contribution-created-at{:title => @latest_contribution.created_at.getutc.iso8601}
 
 
 #whats-new

config/application.rb

@@ -20,7 +20,7 @@ module OpenneoImpressItems
     # config.plugins = [ :exception_notification, :ssl_requirement, :all ]
 
     # Activate observers that should always be running
-    config.active_record.observers = :item_observer, :user_sweeper
+    config.active_record.observers = :contribution_observer, :item_observer, :user_sweeper
 
     # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
     # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.

config/assets.yml

@@ -14,6 +14,7 @@ javascripts:
     - public/javascripts/outfits/edit.js
   
   new_outfit_package:
+    - public/javascripts/jquery.timeago.js
     - public/javascripts/pet_query.js
     - public/javascripts/outfits/new.js
   

public/javascripts/jquery.timeago.js

@@ -0,0 +1,152 @@
+/**
+ * Timeago is a jQuery plugin that makes it easy to support automatically
+ * updating fuzzy timestamps (e.g. "4 minutes ago" or "about 1 day ago").
+ *
+ * @name timeago
+ * @version 0.11.4
+ * @requires jQuery v1.2.3+
+ * @author Ryan McGeary
+ * @license MIT License - http://www.opensource.org/licenses/mit-license.php
+ *
+ * For usage and examples, visit:
+ * http://timeago.yarp.com/
+ *
+ * Copyright (c) 2008-2012, Ryan McGeary (ryan -[at]- mcgeary [*dot*] org)
+ */
+(function($) {
+  $.timeago = function(timestamp) {
+    if (timestamp instanceof Date) {
+      return inWords(timestamp);
+    } else if (typeof timestamp === "string") {
+      return inWords($.timeago.parse(timestamp));
+    } else if (typeof timestamp === "number") {
+      return inWords(new Date(timestamp));
+    } else {
+      return inWords($.timeago.datetime(timestamp));
+    }
+  };
+  var $t = $.timeago;
+
+  $.extend($.timeago, {
+    settings: {
+      refreshMillis: 60000,
+      allowFuture: false,
+      strings: {
+        prefixAgo: null,
+        prefixFromNow: null,
+        suffixAgo: "ago",
+        suffixFromNow: "from now",
+        seconds: "less than a minute",
+        minute: "about a minute",
+        minutes: "%d minutes",
+        hour: "about an hour",
+        hours: "about %d hours",
+        day: "a day",
+        days: "%d days",
+        month: "about a month",
+        months: "%d months",
+        year: "about a year",
+        years: "%d years",
+        wordSeparator: " ",
+        numbers: []
+      }
+    },
+    inWords: function(distanceMillis) {
+      var $l = this.settings.strings;
+      var prefix = $l.prefixAgo;
+      var suffix = $l.suffixAgo;
+      if (this.settings.allowFuture) {
+        if (distanceMillis < 0) {
+          prefix = $l.prefixFromNow;
+          suffix = $l.suffixFromNow;
+        }
+      }
+
+      var seconds = Math.abs(distanceMillis) / 1000;
+      var minutes = seconds / 60;
+      var hours = minutes / 60;
+      var days = hours / 24;
+      var years = days / 365;
+
+      function substitute(stringOrFunction, number) {
+        var string = $.isFunction(stringOrFunction) ? stringOrFunction(number, distanceMillis) : stringOrFunction;
+        var value = ($l.numbers && $l.numbers[number]) || number;
+        return string.replace(/%d/i, value);
+      }
+
+      var words = seconds < 45 && substitute($l.seconds, Math.round(seconds)) ||
+        seconds < 90 && substitute($l.minute, 1) ||
+        minutes < 45 && substitute($l.minutes, Math.round(minutes)) ||
+        minutes < 90 && substitute($l.hour, 1) ||
+        hours < 24 && substitute($l.hours, Math.round(hours)) ||
+        hours < 42 && substitute($l.day, 1) ||
+        days < 30 && substitute($l.days, Math.round(days)) ||
+        days < 45 && substitute($l.month, 1) ||
+        days < 365 && substitute($l.months, Math.round(days / 30)) ||
+        years < 1.5 && substitute($l.year, 1) ||
+        substitute($l.years, Math.round(years));
+
+      var separator = $l.wordSeparator === undefined ?  " " : $l.wordSeparator;
+      return $.trim([prefix, words, suffix].join(separator));
+    },
+    parse: function(iso8601) {
+      var s = $.trim(iso8601);
+      s = s.replace(/\.\d+/,""); // remove milliseconds
+      s = s.replace(/-/,"/").replace(/-/,"/");
+      s = s.replace(/T/," ").replace(/Z/," UTC");
+      s = s.replace(/([\+\-]\d\d)\:?(\d\d)/," $1$2"); // -04:00 -> -0400
+      return new Date(s);
+    },
+    datetime: function(elem) {
+      var iso8601 = $t.isTime(elem) ? $(elem).attr("datetime") : $(elem).attr("title");
+      return $t.parse(iso8601);
+    },
+    isTime: function(elem) {
+      // jQuery's `is()` doesn't play well with HTML5 in IE
+      return $(elem).get(0).tagName.toLowerCase() === "time"; // $(elem).is("time");
+    }
+  });
+
+  $.fn.timeago = function() {
+    var self = this;
+    self.each(refresh);
+
+    var $s = $t.settings;
+    if ($s.refreshMillis > 0) {
+      setInterval(function() { self.each(refresh); }, $s.refreshMillis);
+    }
+    return self;
+  };
+
+  function refresh() {
+    var data = prepareData(this);
+    if (!isNaN(data.datetime)) {
+      $(this).text(inWords(data.datetime));
+    }
+    return this;
+  }
+
+  function prepareData(element) {
+    element = $(element);
+    if (!element.data("timeago")) {
+      element.data("timeago", { datetime: $t.datetime(element) });
+      var text = $.trim(element.text());
+      if (text.length > 0 && !($t.isTime(element) && element.attr("title"))) {
+        element.attr("title", text);
+      }
+    }
+    return element.data("timeago");
+  }
+
+  function inWords(date) {
+    return $t.inWords(distance(date));
+  }
+
+  function distance(date) {
+    return (new Date().getTime() - date.getTime());
+  }
+
+  // fix for IE6 suckage
+  document.createElement("abbr");
+  document.createElement("time");
+}(jQuery));

public/javascripts/outfits/new.js

@@ -182,3 +182,4 @@ function addDisqusCount() {
   (document.getElementsByTagName('HEAD')[0] || document.getElementsByTagName('BODY')[0]).appendChild(s);}
 })();
 
+$('#latest-contribution-created-at').timeago();