Reform + Paperclip + S3

[rapides]

Let's consider following example:

  # .../pitches_controller.rb

  def upload_avatar
    pitch = Pitch.find(params[:id])
    form = PitchAvatarForm.new(pitch)
    if form.validate(pitch_avatar_params)
      form.save
      on_pitch_avatar_upload_succeeded(form)
    else
      on_pitch_avatar_upload_fialed(form)
    end
  end

# .../forms/pitch_avatar_form.rb

class PitchAvatarForm < Reform::Form
  model :pitch

  property :image
  property :image_file_name
  property :image_content_type
  property :image_file_size

  validates :image,
            file_content_type: { allow: ['image/jpeg', 'image/jpg', 'image/png'] },
            file_size:  { less_than: 2.megabytes }
end

On each form#save execution it couses following error:

form.save
NoMethodError: undefined method `sub' for nil:NilClass
from /Users/rapide/.rvm/gems/ruby-2.3.0@bttf/gems/paperclip-4.2.2/lib/paperclip/storage/s3.rb:255:in `s3_object'

I fixed this issue by assigning attributes to the pitch before creating the form but it looks like an ugly hack. Any idea how to solve this in better way?

[musaffa]

Does this work without the validations of image attributes?

[rapides]

Nope, still get the same error.

[musaffa]

Then it's not probably related to file_validators gem. For file uploading I highly recommend Shrine over Paperclip.