Keeping uploaded files between deployments

kosmas — Mon, 26 Nov 2007 15:58:59 +0000

Problem
You are using file_column plugin (or maybe another plugin?), to upload files in your ruby on rails application. Because the files are big you don’t want to have a different copy stored in your subversion repository for each different deployment version. You want to keep a common folder with all your uploaded files, and use it with every different deployment version.

Solution
For the example, we will have a numbers table that has two file_column uploadable columns (intro,voice_mail), with the following migration:

class CreateNumbers < ActiveRecord::Migration
  def self.up
    create_table :numbers do |t|
      t.column :customer_id, :int, :null => false
      t.column :phone_no, :string, :null => false
      t.column :intro, :string
      t.column :vmail, :string
      t.column :created_at, :datetime
      t.column :updated_at, :datetime
    end

  def self.down
    drop_table :numbers
  end
end

If you already have used cap deploy or cap setup you should have a shared folder in your deployment server.
You should copy the intro and vmail folders that should be located on your public/number folder on your local development client, on a folder called number in your development server in your shared folder.
Create a file in your local pc in lib/cap_recipes.rb:
```
Capistrano.configuration(:must_exist).load do

  desc "Keep generated uploaded files between deployments"
    task :after_symlink do
       run "rm -drf #{deploy_to}/#{current_dir}/public/number"
       sudo "ln -nfs #{shared_path}/number #{deploy_to}/#{current_dir}/public"
    end
  end
```
Be careful with the naming of the task as (at least for capistrano 1.4 that I’m using), it must have a special name as after_symlink.
Also be careful that if you try to use before_symlink, it won’t work as the current symlink won’t be setup.
In your config/deploy.rb file add at the top the following:
```
require 'lib/cap_recipes'
```
Now you should be ready to deploy your new version so:
```
svn -m "added customised capistrano recipes" commit
```
make sure that you check in your version in subversion, and then:
```
cap deploy
```
you should be able to see a link in your current/public folder called number that points to the shared/number folder that hold all the uploaded files.

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Keeping uploaded files between deployments