Module: Mongoid::PaperclipQueue

Defined in:
lib/mongoid_paperclip_queue.rb

Defined Under Namespace

Modules: InstanceMethods, Redis Classes: Queue

Instance Method Summary collapse

Instance Method Details

#has_queued_attached_file(field, options = {}) ⇒ Object 



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# File 'lib/mongoid_paperclip_queue.rb', line 64

def has_queued_attached_file(field, options = {})


  # Include Paperclip and Paperclip::Glue for compatibility
  unless self.ancestors.include?(::Paperclip)
    include ::Paperclip
    include ::Paperclip::Glue
  end
  
  #send :include, InstanceMethods
  include InstanceMethods

  # Invoke Paperclip's #has_attached_file method and passes in the
  # arguments specified by the user that invoked Mongoid::Paperclip#has_mongoid_attached_file
  if options[:logger].nil? && Mongoid::Config.logger.present?
    options[:logger] = Mongoid::Config.logger
  end
  has_attached_file(field, options)
  
  # halt processing initially, but allow override for reprocess!
  self.send :"before_#{field}_post_process", :halt_processing
  
  define_method "#{field}_processing!" do 
    true
  end
  
  self.send :after_save do
    if self.changed.include? "#{field}_updated_at"
      # add a Redis key for the application to check if we're still processing
      # we don't need it for the processing, it's just a helpful tool
      Mongoid::PaperclipQueue::Redis.server.sadd(self.class.name, "#{field}:#{self.id.to_s}")

      # check if the document is embedded. if so, we need that to find it later
      if self.embedded?
        parents = []
        path = self
        associations = path.reflect_on_all_associations(:embedded_in)
        until associations.empty?
          # there should only be one :embedded_in per model, correct me if I'm wrong
          association = associations.first
          path = path.send(association.name.to_sym)
          parents << [association.class_name,association.name, path.id.to_s]
          associations = path.reflect_on_all_associations(:embedded_in)

        end
        # we need the relation name, not the class name
        args = [ self.metadata.name, field, self.id.to_s] + parents.reverse
      else 
        # or just use our default params like any other Paperclip model
        args = [self.class.name, field, self.id.to_s]
      end

      # then queue up our processing
      Mongoid::PaperclipQueue::Queue.enqueue(*args)
    end
  end
  
  ## 
  # Define the necessary collection fields in Mongoid for Paperclip
  field(:"#{field}_file_name", :type => String)
  field(:"#{field}_content_type", :type => String)
  field(:"#{field}_file_size", :type => Integer)
  field(:"#{field}_updated_at", :type => DateTime)
end