cache recent_posts and recent_plantings partials

Gemfile

@@ -17,14 +17,11 @@ gem 'activemerchant', '1.33.0',
 gem 'active_utils', '1.0.5',
   :path => 'vendor/gems/active_utils-1.0.5'
 
-
-# Bundle edge Rails instead:
-# gem 'rails', :git => 'git://github.com/rails/rails.git'
-
 group :production, :staging do
   gem 'pg'
   gem 'newrelic_rpm'
   gem 'unicorn'
+  gem 'dalli'
 end
 
 # Gems used only for assets and not required

Gemfile.lock

@@ -74,6 +74,7 @@ GEM
       compass (>= 0.12.2, < 0.14)
     daemon_controller (1.1.2)
     daemons (1.1.9)
+    dalli (2.6.4)
     debugger (1.5.0)
       columnize (>= 0.3.1)
       debugger-linecache (~> 1.2.0)
@@ -256,6 +257,7 @@ DEPENDENCIES
   capistrano-ext
   coffee-rails (~> 3.2.1)
   compass-rails (~> 1.0.3)
+  dalli
   debugger
   devise
   diff-lcs

app/controllers/plantings_controller.rb

@@ -1,5 +1,8 @@
 class PlantingsController < ApplicationController
   load_and_authorize_resource
+
+  cache_sweeper :planting_sweeper
+
   # GET /plantings
   # GET /plantings.json
   def index

app/controllers/posts_controller.rb

@@ -1,5 +1,8 @@
 class PostsController < ApplicationController
   load_and_authorize_resource
+
+  cache_sweeper :post_sweeper
+
   # GET /posts
   # GET /posts.json
 

app/models/planting_sweeper.rb

@@ -0,0 +1,21 @@
+class PlantingSweeper < ActionController::Caching::Sweeper
+  observe Planting
+
+  def after_create(planting)
+    expire_cache_for(planting)
+  end
+
+  def after_update(planting)
+    expire_cache_for(planting)
+  end
+
+  def after_destroy(planting)
+    expire_cache_for(planting)
+  end
+
+  private
+  def expire_cache_for(planting)
+    expire_fragment('recent_plantings')
+  end
+end
+

app/models/post_sweeper.rb

@@ -0,0 +1,16 @@
+class PostSweeper < ActionController::Caching::Sweeper
+  observe Post
+
+  def after_create(post)
+    expire_fragment('recent_posts')
+  end
+
+  def after_update(post)
+    expire_fragment('recent_posts')
+  end
+
+  def after_destroy(post)
+    expire_fragment('recent_posts')
+  end
+
+end

app/views/shared/_recent_plantings.html.haml

@@ -1,12 +1,14 @@
-- if @plantings
-  %ul
-    - @plantings.each do |p|
-      %li
-        = link_to "#{p.crop_system_name} in #{p.location}", p
-        - if p.planted_at
-          on
-          = p.planted_at
-- else
-  %p None yet.
+- cache('recent_plantings') do
+  - if @plantings
+    %ul
+      - @plantings.each do |p|
+        %li
+          = link_to "#{p.crop_system_name} in #{p.location}", p
+          - if p.planted_at
+            on
+            = p.planted_at
+  - else
+    %p None yet.
+
 - if can? :create, Planting
   %p= link_to "Plant something", new_planting_path, :class => 'btn btn-primary'

app/views/shared/_recent_posts.html.haml

@@ -1,17 +1,19 @@
-- if @posts
-  %ul
-    - @posts.each do |p|
-      %li
-        = link_to p.subject, p
-        - unless @member
-          posted by
-          = link_to p.author, p.author
-        - if p.forum
-          in
-          = link_to p.forum.name, p.forum
-        on
-        = p.created_at.to_s(:date)
-- else
-  %p None yet.
+- cache('recent_posts') do
+  - if @posts
+    %ul
+      - @posts.each do |p|
+        %li
+          = link_to p.subject, p
+          - unless @member
+            posted by
+            = link_to p.author, p.author
+          - if p.forum
+            in
+            = link_to p.forum.name, p.forum
+          on
+          = p.created_at.to_s(:date)
+  - else
+    %p None yet.
+
 - if can? :create, Post
   %p= link_to "Post something", new_post_path, :class => 'btn btn-primary'

config/environments/development.rb

@@ -11,7 +11,10 @@ Growstuff::Application.configure do
 
   # Show full error reports and disable caching
   config.consider_all_requests_local       = true
-  config.action_controller.perform_caching = false
+
+  # cache for testing/experimentation - turn off for normal dev use
+  config.action_controller.perform_caching = true
+  config.cache_store = :memory_store
 
   # Don't care if the mailer can't send
   config.action_mailer.raise_delivery_errors = false

config/environments/production.rb

@@ -40,7 +40,7 @@ Growstuff::Application.configure do
   # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
   # Use a different cache store in production
-  # config.cache_store = :mem_cache_store
+  config.cache_store = :dalli_store
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server
   # config.action_controller.asset_host = "http://assets.example.com"

config/environments/staging.rb

@@ -40,7 +40,7 @@ Growstuff::Application.configure do
   # config.logger = ActiveSupport::TaggedLogging.new(SyslogLogger.new)
 
   # Use a different cache store in production
-  # config.cache_store = :mem_cache_store
+  config.cache_store = :dalli_store
 
   # Enable serving of images, stylesheets, and JavaScripts from an asset server
   # config.action_controller.asset_host = "http://assets.example.com"