From d5ddc762b730aa8b2034043200de2925752ec3d5 Mon Sep 17 00:00:00 2001
From: Daniela Soares Feitosa <danielafeitosa@colivre.coop.br>
Date: Thu, 2 Sep 2010 15:44:51 -0300
Subject: [PATCH] Added libs to create thumbnails in background

---
 config/initializers/delayed_attachment_fu.rb |  1 +
 lib/create_thumbnails_job.rb                 |  6 ++++++
 lib/delayed_attachment_fu.rb                 | 53 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/unit/create_thumbnails_job_test.rb      | 27 +++++++++++++++++++++++++++
 4 files changed, 87 insertions(+), 0 deletions(-)
 create mode 100644 config/initializers/delayed_attachment_fu.rb
 create mode 100644 lib/create_thumbnails_job.rb
 create mode 100644 lib/delayed_attachment_fu.rb
 create mode 100644 test/unit/create_thumbnails_job_test.rb

diff --git a/config/initializers/delayed_attachment_fu.rb b/config/initializers/delayed_attachment_fu.rb
new file mode 100644
index 0000000..650338a
--- /dev/null
+++ b/config/initializers/delayed_attachment_fu.rb
@@ -0,0 +1 @@
+require 'delayed_attachment_fu'
diff --git a/lib/create_thumbnails_job.rb b/lib/create_thumbnails_job.rb
new file mode 100644
index 0000000..bbe99db
--- /dev/null
+++ b/lib/create_thumbnails_job.rb
@@ -0,0 +1,6 @@
+class CreateThumbnailsJob < Struct.new(:class_name, :file_id)
+  def perform
+    file = class_name.constantize.find(file_id)
+    file.create_thumbnails
+  end
+end
diff --git a/lib/delayed_attachment_fu.rb b/lib/delayed_attachment_fu.rb
new file mode 100644
index 0000000..5193245
--- /dev/null
+++ b/lib/delayed_attachment_fu.rb
@@ -0,0 +1,53 @@
+module DelayedAttachmentFu
+
+  module ClassMethods
+    def delay_attachment_fu_thumbnails
+      include DelayedAttachmentFu::InstanceMethods
+      after_create do |file|
+        if file.image?
+          Delayed::Job.enqueue CreateThumbnailsJob.new(file.class.name, file.id)
+        end
+      end
+    end
+  end
+
+  module InstanceMethods
+    # skip processing with RMagick
+    def process_attachment
+    end
+
+    def after_process_attachment
+      save_to_storage
+      @temp_paths.clear
+      @saved_attachment = nil
+      callback :after_attachment_saved
+    end
+
+    def create_thumbnails
+      if thumbnailable?
+        self.class.with_image(full_filename) do |img|
+          self.width = img.columns
+          self.height = img.rows
+          self.save!
+        end
+        self.class.attachment_options[:thumbnails].each do |suffix, size|
+          self.create_or_update_thumbnail(self.full_filename, suffix, size)
+        end
+        self.update_attributes!(:thumbnails_processed => true)
+      end
+    end
+
+    def public_filename(size=nil)
+      if self.thumbnails_processed
+        super(size)
+      else
+        size ||= 'thumb'
+        '/images/icons-app/image-loading-%s.png' % size
+      end
+    end
+
+
+  end
+end
+
+ActiveRecord::Base.send(:extend, DelayedAttachmentFu::ClassMethods)
diff --git a/test/unit/create_thumbnails_job_test.rb b/test/unit/create_thumbnails_job_test.rb
new file mode 100644
index 0000000..8842222
--- /dev/null
+++ b/test/unit/create_thumbnails_job_test.rb
@@ -0,0 +1,27 @@
+require File.dirname(__FILE__) + '/../test_helper'
+
+class CreateThumbnailsJobTest < ActiveSupport::TestCase
+
+  should 'create thumbnails to uploaded files' do
+    person = create_user('test_user').person
+    file = UploadedFile.create!(:uploaded_data => fixture_file_upload('/files/rails.png', 'image/png'), :profile => person)
+
+    assert_equal [], file.thumbnails
+    job = CreateThumbnailsJob.new(file.class.name, file.id)
+    job.perform
+    file.reload
+    assert_not_equal [], file.thumbnails
+  end
+
+  should 'set thumbnails_processed to true after finished' do
+    person = create_user('test_user').person
+    file = UploadedFile.create!(:uploaded_data => fixture_file_upload('/files/rails.png', 'image/png'), :profile => person)
+
+    job = CreateThumbnailsJob.new(file.class.name, file.id)
+    job.perform
+
+    file.reload
+    assert file.thumbnails_processed
+  end
+
+end
--
libgit2 0.21.2