CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-3paperclipattachment
Lucamug
Lucamug

Reputation: 802

File attachment and handling validation errors with Rails and Paperclip

I have a form to send a message with attachments.

Is there a simple way to make rails to remember the already uploaded files? (I have been using paperclip)

Upvotes: 3

Views: 1851

Answers (2)

galatians
galatians

Reputation: 918

I had to fix this on a recent project using PaperClip. It's a bit hacky but it works. I've tried calling cache_images() using after_validation and before_save in the model but it fails on create for some reason that I can't determine so I just call it from the controller instead. Hopefully this saves someone else some time!

model:

class Shop < ActiveRecord::Base    
  attr_accessor :logo_cache

  has_attached_file :logo

  def cache_images
    if logo.staged?
      if invalid?
        FileUtils.cp(logo.queued_for_write[:original].path, logo.path(:original))
        @logo_cache = encrypt(logo.path(:original))
      end
    else
      if @logo_cache.present?
        File.open(decrypt(@logo_cache)) {|f| assign_attributes(logo: f)}
      end
    end
  end

  private

  def decrypt(data)
    return '' unless data.present?
    cipher = build_cipher(:decrypt, 'mypassword')
    cipher.update(Base64.urlsafe_decode64(data).unpack('m')[0]) + cipher.final
  end

  def encrypt(data)
    return '' unless data.present?
    cipher = build_cipher(:encrypt, 'mypassword')
    Base64.urlsafe_encode64([cipher.update(data) + cipher.final].pack('m'))
  end

  def build_cipher(type, password)
    cipher = OpenSSL::Cipher::Cipher.new('DES-EDE3-CBC').send(type)
    cipher.pkcs5_keyivgen(password)
    cipher
  end

end

controller:

def create
  @shop = Shop.new(shop_params)
  @shop.user = current_user
  @shop.cache_images

  if @shop.save
    redirect_to account_path, notice: 'Shop created!'
  else
    render :new
  end
end

def update
  @shop = current_user.shop
  @shop.assign_attributes(shop_params)
  @shop.cache_images

  if @shop.save
    redirect_to account_path, notice: 'Shop updated.'
  else
    render :edit
  end
end

view:

= f.file_field :logo
= f.hidden_field :logo_cache

- if @shop.logo.file?
  %img{src: @shop.logo.url, alt: ''}

Upvotes: 0

iwasrobbed
iwasrobbed

Reputation: 46703

One way would be to create the Message object initially with default (passing) values when you start uploading the file and then just issue a PUT request to update the message object using the form.

This way, the Message object is valid upon creation and the only thing you're validating is that the update information is valid as well (if it's not, the message will just have the default value and the user won't have to re-upload the file).

You can set up the database attribute (via a Rails migration) to have a set default value so you don't have to do this in the controller.

change_column_default(:messages, :content, "You have a new message!")

Upvotes: 1

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