add paperclip

Gemfile

@@ -3,6 +3,9 @@ source 'https://rubygems.org'
 
 # Bundle edge Rails instead: gem 'rails', github: 'rails/rails'
 gem 'rails', '4.2.4'
+
+gem "paperclip"
+
 # Use sqlite3 as the database for Active Record
 gem 'sqlite3'
 # Use SCSS for stylesheets
@@ -44,4 +47,3 @@ group :development do
   # Spring speeds up development by keeping your application running in the background. Read more: https://github.com/rails/spring
   gem 'spring'
 end
-

Gemfile.lock

@@ -41,6 +41,10 @@ GEM
       debug_inspector (>= 0.0.1)
     builder (3.2.2)
     byebug (6.0.2)
+    climate_control (0.0.3)
+      activesupport (>= 3.0)
+    cocaine (0.5.7)
+      climate_control (>= 0.0.3, < 1.0)
     coffee-rails (4.1.0)
       coffee-script (>= 2.2.0)
       railties (>= 4.0.0, < 5.0)
@@ -67,11 +71,18 @@ GEM
     mail (2.6.3)
       mime-types (>= 1.16, < 3)
     mime-types (2.6.2)
+    mimemagic (0.3.0)
     mini_portile (0.6.2)
     minitest (5.8.0)
     multi_json (1.11.2)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
+    paperclip (4.3.0)
+      activemodel (>= 3.2.0)
+      activesupport (>= 3.2.0)
+      cocaine (~> 0.5.5)
+      mime-types
+      mimemagic (= 0.3.0)
     rack (1.6.4)
     rack-test (0.6.3)
       rack (>= 1.0)
@@ -143,6 +154,7 @@ DEPENDENCIES
   coffee-rails (~> 4.1.0)
   jbuilder (~> 2.0)
   jquery-rails
+  paperclip
   rails (= 4.2.4)
   sass-rails (~> 5.0)
   sdoc (~> 0.4.0)

app/controllers/conferences_controller.rb

@@ -14,7 +14,7 @@ def index
     elsif params[:sort] == "attendees_count"
       @events = @events.order("attendees_count desc")
     elsif params[:sort] == "last_registered_at"
-      @events = @events.order("last_registered_at desc")            
+      @events = @events.order("last_registered_at desc")
     end
 
     if params[:event_id]
@@ -41,6 +41,11 @@ def create
 
   def update
     @event = Event.find(params[:id])
+
+    if params[:destroy_logo] == "1"
+      @event.logo = nil
+    end
+
     if @event.update(event_params)
       redirect_to conferences_path
     else
@@ -59,7 +64,7 @@ def destroy
   private
 
   def event_params
-    params.require(:event).permit(:name, :description, :url, :category_id, :group_ids => [] )
+    params.require(:event).permit(:name, :description, :url, :category_id, :logo, :group_ids => [] )
   end
 
 end

app/models/event.rb

@@ -1,5 +1,8 @@
 class Event < ActiveRecord::Base
 
+  has_attached_file :logo, styles: { medium: "300x300>", thumb: "100x100>" }, default_url: "/images/:style/missing.png"
+  validates_attachment_content_type :logo, content_type: /\Aimage\/.*\Z/
+
   validates_presence_of :name
 
   belongs_to :category

app/views/conferences/index.html.erb

@@ -48,6 +48,16 @@
 
   <%= f.label :description %>
   <%= f.text_area :description %>
+
+  <div class="form-group">
+    <%= f.label :logo, "LOGO檔案" %>
+    <%= f.file_field :logo %>
+
+    <% if @event.logo.exists? %>
+      <%= check_box_tag "destroy_logo", "1" %> 刪除檔案
+    <% end %>
+  </div>
+
   <%= f.submit "送出" %>
 
 <% end %>

app/views/conferences/show.html.erb

@@ -1,5 +1,10 @@
 <%= @event.name %>
 
+<% if @event.logo.exists? %>
+  <%= link_to image_tag(@event.logo.url(:thumb)),
+            @event.logo.url %>
+<% end %>
+
 <%= simple_format( @event.description ) %>
 
 <%= link_to "Back to index", conferences_path %>

db/migrate/20151005021311_add_paperclip_to_event.rb

@@ -0,0 +1,7 @@
+class AddPaperclipToEvent < ActiveRecord::Migration
+
+  def change
+    add_attachment :events, :logo
+  end
+
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20150930041524) do
+ActiveRecord::Schema.define(version: 20151005021311) do
 
   create_table "attendees", force: :cascade do |t|
     t.integer  "event_id"
@@ -37,6 +37,10 @@
     t.integer  "category_id"
     t.integer  "attendees_count",    default: 0
     t.datetime "last_registered_at"
+    t.string   "logo_file_name"
+    t.string   "logo_content_type"
+    t.integer  "logo_file_size"
+    t.datetime "logo_updated_at"
   end
 
   add_index "events", ["category_id"], name: "index_events_on_category_id"