app/models/template.rb
class Template
include Mongoid::Document
include Mongoid::Timestamps::Short
include Mongoid::Slug
field :name, type: String
field :font_color, type: String, default: '#000000'
slug :name
mount_uploader :image, TemplateImageUploader
validates_presence_of :name, :font_color
validates_length_of :name, maximum: 100
validates_length_of :font_color, maximum: 7
belongs_to :user
has_many :certificates, dependent: :restrict_with_error
def destroy_image
image_file = image.file
ImageFile.remove(image_file) if image_file
image_cached = Rails.root.join('tmp', 'templates', id.to_s)
File.delete(image_cached) if File.exist?(image_cached)
end
end