Paperclip how to access instance variables?

Question

Ruby on Rails

Greetings! Help to access object variable inside textmark[:text] stylesheet. I need to make a text watermark with dynamic text.

has_mongoid_attached_file :image,
        path: ':rails_root/public/uploads/:class/cars/:id/:style.:extension',
        url: '/uploads/:class/cars/:id/:style.:extension',
        styles: {
            small: {
              geometry: '640x400#',
              processors: [:watermark, :textmark],
              watermark_path: "#{Rails.root}/public/watermark.png",
              position: 'Center',
              textmark: {
                text: "Вот сюда надо вывести car_id",
                position: "SouthWest",
                offset: "+10+10",
                color: "white",
                size: "20"
              }
            }
        }

Answer 1

Use lambdas ( https://github.com/thoughtbot/paperclip#dynamic-st... You
can use any data from your model inside a lambda. For example:

has_mongoid_attached_file :image,
        path: ':rails_root/public/uploads/:class/cars/:id/:style.:extension',
        url: '/uploads/:class/cars/:id/:style.:extension',
        styles: lambda { |your_model| your_model.generate_styles }

def generate_styles
  {
    small: {
      textmark: {
        text: car_id
      }
    }
  }
end