Add Paperclip Gem

.gitignore

@@ -20,3 +20,6 @@ doc/
 .project
 .DS_Store
 .idea
+
+# Ignore Paperclip uploaded images
+/public/system

Gemfile

@@ -5,6 +5,7 @@ gem 'rails', '4.0.0'
 gem 'jquery-rails'
 gem 'devise'
 gem 'simple_form', '~> 3.0.0.rc'
+gem "paperclip", "~> 3.0"
 
 group :production do
 	gem 'pg'

Gemfile.lock

@@ -31,6 +31,10 @@ GEM
     bootstrap-sass (2.3.2.2)
       sass (~> 3.2)
     builder (3.1.4)
+    climate_control (0.0.3)
+      activesupport (>= 3.0)
+    cocaine (0.5.1)
+      climate_control (>= 0.0.3, < 1.0)
     coffee-rails (4.0.0)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0.beta, < 5.0)
@@ -61,6 +65,11 @@ GEM
     minitest (4.7.5)
     multi_json (1.8.0)
     orm_adapter (0.4.0)
+    paperclip (3.5.1)
+      activemodel (>= 3.0.0)
+      activesupport (>= 3.0.0)
+      cocaine (~> 0.5.0)
+      mime-types
     pg (0.17.0)
     polyglot (0.3.3)
     protected_attributes (1.0.3)
@@ -135,6 +144,7 @@ DEPENDENCIES
   devise
   jbuilder (= 1.0.2)
   jquery-rails
+  paperclip (~> 3.0)
   pg
   protected_attributes
   rails (= 4.0.0)

app/models/pin.rb

@@ -1,9 +1,13 @@
 class Pin < ActiveRecord::Base
-	attr_accessible :description 
+	attr_accessible :description, :image
+	has_attached_file :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
+	has_attached_file :image, :styles => { :medium => "300x300>" }
 
-	validates :user_id, presence: true
 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

@@ -1,9 +1,10 @@
 
 <tr>
-<td><%= pin.description %></td>
-<td><%= link_to 'Show', pin %></td>
-<% if current_user == pin.user %>
-<td><%= link_to 'Edit', edit_pin_path(pin) %></td>
-<td><%= link_to 'Destroy', pin, method: :delete, data: { confirm: 'Are you sure?' } %></td>
-<% end %>
+	<td><%= image_tag pin.image(:medium) %></td>
+	<td><%= pin.description %></td>
+	<td><%= link_to 'Show', pin %></td>
+	<% if current_user == pin.user %>
+		<td><%= link_to 'Edit', edit_pin_path(pin) %></td>
+		<td><%= link_to 'Destroy', pin, method: :delete, data: { confirm: 'Are you sure?' } %></td>
+	<% end %>
 </tr>

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/20130919053303_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 that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20130919041835) do
+ActiveRecord::Schema.define(version: 20130919053303) do
 
   create_table "pins", force: true do |t|
     t.string   "description"
     t.datetime "created_at"
     t.datetime "updated_at"
     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"