CODEWITHSUNDEEP
ruby-on-railsruby-on-rails-4carrierwaveimage-uploading
Nick Shears
Nick Shears

Reputation: 1133

Only validate when an attribute is present with Rails and Carrierwave

Here's the code I have

class FactSheet < ActiveRecord::Base
  mount_uploader :image, ImageUploader
end

And the uploader

class ImageUploader < CarrierWave::Uploader::Base
  def extension_white_list
    %w(jpg jpeg gif png)
  end
end

This is all good, but the problem I'm facing is that in this scenario it's optional for a user to supply an image, so I don't want to be seeing the following validation error if they don't supply one

Image You are not allowed to upload "" files, allowed types: jpg, jpeg, gif, png

What's the best way to only validate/mount the uploader if the image is present?

Upvotes: 0

Views: 250

Answers (1)

uday
uday

Reputation: 8710

In your FactSheet model, you could something like this:

   validates :attachment, allow_blank: true, format: {
    with: %r{\.(gif|jpg|png|jpeg)\Z}i,
    message: 'image must be a GIF, JPEG, PNG format'
   }

Upvotes: 1

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