I have two custom validators that check the dimensions of attachments set on my Model using Paperclip. For some reason, the second validator (promotion_image_dimensions) does not run when I manually upload an image that has invalid dimensions. It saves it to the database no problem. Oddly enough, my test show that this validation is being ran, a…

promotion_attachment.rb

class PromotionAttachment < ActiveRecord::Base
  belongs_to :promotion

	attr_accessible :like_gate_image, :promotion_image


  [:like_gate_image, :promotion_image].each do |file_name|
    options = {
      styles: {
        medium: "300x300>}",
        thumb: "100x100>"
      },
      :url => "/system/:attachment/:id/:style.:extension",
    }

    # If ENABLE_S3 returns TRUE (config/initializers/_tmg.rb) then files will be sent to s3 otherwise they will be stored locally
    options.update({
      storage: :s3,
      s3_credentials: "#{::Rails.root}/config/aws.yml"
    }) if ENABLE_S3

    has_attached_file file_name, options
  end

 

  validate :like_gate_image_dimensions

  validate :promotion_image_dimensions


  def like_gate_image_dimensions
    if like_gate_image.present? && !like_gate_image.exists?
      dimensions = Paperclip::Geometry.from_file(like_gate_image.queued_for_write[:original].path)
      if dimensions.width != 810 && dimensions.height > 199
        errors.add(:like_gate_image,'width must be equal to 810px, and the height must be atleast 200px.')
      end
      puts "ran from 1"
    end
  end

  def promotion_image_dimensions
    if promotion_image.present?  && !promotion_image.exists?
      dimensions = Paperclip::Geometry.from_file(promotion_image.queued_for_write[:original].path)
      if dimensions.width != 810 && dimensions.height > 199
        errors.add(:promotion_image,'width must be equal to 810px, and the height must be atleast 200px.')
      end
      puts "ran from 2"
    end
  end


end

promotion_attachment_spec.rb

  describe "validate the size of promotion_image" do
		let(:promotion_attachment) {FactoryGirl.build(:promotion_attachment)}

		subject { promotion_attachment }

		context "Does not allow width smaller than 810px" do

			before { promotion_attachment.promotion_image = File.new(Rails.root.join('spec', 'factories', 'width_to_small.png'))}

			it { should have(1).error_on(:promotion_image)}
		end
	end