Rails の paperclip で画像を扱う場合のメモ

(Rails3.2.13)

• thoughtbot/paperclip · GitHub

paperclip 試してみる

ImageMagick をインストールしておく

sudo port install ImageMagick

下準備

$ rails new paperclip_app -T --skip-bundle
$ cd paperclip_app

Gemfile

gem "paperclip"

$ bundle install
$ rails g scaffold User name

db/migrate/20130430160550_create_users.rb

    create_table :users do |t|
      t.string :name
      t.attachment :avatar

$ rake db:migrate

app/models/user.rb

画像を正方形にしてみる（"300x300>" -> "300x300#"）

• ruby on rails - Simple cropping with Paperclip - Stack Overflow

class User < ActiveRecord::Base
  attr_accessible :name, :avatar
  has_attached_file :avatar, :styles => { :medium => "300x300#", :thumb => "100x100#" }, :default_url => "/images/:style/missing.png"
end

app/views/users/_form.html.erb

  <div class="field">
    <%= f.label :name %><br />
    <%= f.text_field :name %>
  </div>
  <div>
    <%= f.label :avatar %><br />
    <%= f.file_field :avatar %>
  </div>

app/views/users/show.html.erb

<%= image_tag @user.avatar.url %>
<%= image_tag @user.avatar.url(:medium) %>
<%= image_tag @user.avatar.url(:thumb) %>

rails s

• http://localhost:3000/users/