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models/attachment.rb class Attachment < ApplicationRecord attr_accessor :base64 has_one_attached :file after_initialize :set_file private def set_file return if self . base64 . blank? decoded_data = Base64 . decode64 ( self . base64 . split ( ',' )[ 1 ]) self . file = { io: StringIO . new ( decoded_data ), content_type: 'image/jpeg' , filename: 'image.jpg' } end # end of private end