Add Paperclip Gem

.gitignore

@@ -18,4 +18,7 @@ doc/
 *~
 .project
 .DS_Store
-.idea
+.idea
+
+# Ignore Paperclip uploaded files
+/public/system

Gemfile

@@ -4,6 +4,7 @@ gem 'rails', '3.2.13'
 gem 'jquery-rails'
 gem 'devise'
 gem 'simple_form'
+gem "paperclip", "~> 3.4.2"
 
 group :production do
 	gem 'pg'

Gemfile.lock

@@ -34,6 +34,10 @@ GEM
     bootstrap-sass (2.3.2.0)
       sass (~> 3.2)
     builder (3.0.4)
+    climate_control (0.0.3)
+      activesupport (>= 3.0)
+    cocaine (0.5.1)
+      climate_control (>= 0.0.3, < 1.0)
     coffee-rails (3.2.2)
       coffee-script (>= 2.2.0)
       railties (~> 3.2.0)
@@ -62,6 +66,12 @@ GEM
     mime-types (1.23)
     multi_json (1.7.6)
     orm_adapter (0.4.0)
+    paperclip (3.4.2)
+      activemodel (>= 3.0.0)
+      activerecord (>= 3.0.0)
+      activesupport (>= 3.0.0)
+      cocaine (~> 0.5.0)
+      mime-types
     pg (0.14.1)
     pg (0.14.1-x86-mingw32)
     polyglot (0.3.3)
@@ -125,6 +135,7 @@ DEPENDENCIES
   coffee-rails (~> 3.2.1)
   devise
   jquery-rails
+  paperclip (~> 3.4.2)
   pg
   rails (= 3.2.13)
   sass-rails (~> 3.2.3)

app/models/pin.rb

@@ -1,8 +1,13 @@
 class Pin < ActiveRecord::Base
-  attr_accessible :description
+  attr_accessible :description, :image
 
   validates :description, presence: true
+	validates :user_id, presence: true
+	validates_attachment :image, presence: true,
+															 content_type: { content_type: ['image/jpeg', 'image/jpg', 'image/png', 'image/gif'] },
+															 size: { less_than: 5.megabytes }
 
   belongs_to :user
-  validates :user_id, presence: true
+  has_attached_file :image, styles: { medium: "320x240>" }
+
 end

app/views/pins/_form.html.erb

@@ -1,6 +1,9 @@
 <%= simple_form_for(@pin, html: { class: "form-horizontal" }) do |f| %>
   <%= f.error_notification %>
+  <%= f.full_error :image_file_size, class: "alert alert-error" %>
+  <%= f.full_error :image_content_type, class: "alert alert-error" %>
 
+  <%= f.input :image, label: "Upload an image" %>
   <%= f.input :description, as: :text, input_html: { rows: "3" } %>
 
   <div class="form-actions">

app/views/pins/_pin.html.erb

@@ -1,4 +1,5 @@
 <tr>
+<td><%= image_tag pin.image(:medium) %></td>
 <td><%= pin.description %></td>
 <td><%= link_to 'Show', pin %></td>
 <% if current_user == pin.user %>

app/views/pins/index.html.erb

@@ -3,6 +3,7 @@
 <table class="table table-striped">
   <thead>
     <tr>
+      <th>Image</th>
       <th>Description</th>
       <th></th>
       <th></th>

app/views/pins/show.html.erb

@@ -1,6 +1,7 @@
 <div class="row">
 	<div class="span6 offset3">
 		<div class="well">
+			<%= image_tag @pin.image %>
 			<p>
 			  <%= @pin.description %>
 			</p>

db/migrate/20130723160107_add_attachment_image_to_pins.rb

@@ -0,0 +1,11 @@
+class AddAttachmentImageToPins < ActiveRecord::Migration
+  def self.up
+    change_table :pins do |t|
+      t.attachment :image
+    end
+  end
+
+  def self.down
+    drop_attached_file :pins, :image
+  end
+end

db/schema.rb

@@ -11,13 +11,17 @@
 #
 # It's strongly recommended to check this file into your version control system.
 
-ActiveRecord::Schema.define(:version => 20130722190751) do
+ActiveRecord::Schema.define(:version => 20130723160107) do
 
   create_table "pins", :force => true do |t|
     t.string   "description"
-    t.datetime "created_at",  :null => false
-    t.datetime "updated_at",  :null => false
+    t.datetime "created_at",         :null => false
+    t.datetime "updated_at",         :null => false
     t.integer  "user_id"
+    t.string   "image_file_name"
+    t.string   "image_content_type"
+    t.integer  "image_file_size"
+    t.datetime "image_updated_at"
   end
 
   add_index "pins", ["user_id"], :name => "index_pins_on_user_id"