Module: LocusFocus::Acts::PolymorphicPaperclip::ClassMethods

Defined in:
lib/sga/acts_as_polymorphic_paperclip.rb

Instance Method Summary collapse

Instance Method Details

#acts_as_polymorphic_paperclip(options = {}) ⇒ Object

Extends the model to afford the ability to associate other records with the receiving record.

This module needs the paperclip plugin to work www.thoughtbot.com/projects/paperclip



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# File 'lib/sga/acts_as_polymorphic_paperclip.rb', line 16

def acts_as_polymorphic_paperclip(options = {})
  write_inheritable_attribute(:acts_as_polymorphic_paperclip_options, {
    :counter_cache => options[:counter_cache],
    :styles => options[:styles]
  })

  class_inheritable_reader :acts_as_polymorphic_paperclip_options

  has_many :attachings, :as => :attachable, :dependent => :destroy

  has_many :assets, :through => :attachings do
    def attach(asset_id)
      asset_id = extract_id(asset_id)
      asset = Asset.find(asset_id)
      @owner.assets << asset
      @owner.assets(true)
    end
    
    def detach(asset_id, delete_if_no_attachings = false)
      asset_id = extract_id(asset_id)
      attaching = @owner.attachings.find(:first, :conditions => ['asset_id = ?', asset_id])
      attachable = attaching.attachable
      raise ActiveRecord::RecordNotFound unless attaching
      result = attaching.destroy
      
      asset = Asset.find(asset_id)
      if asset.attachings.empty? && delete_if_no_attachings# delete if no longer attached to anything
        override_default_styles, normalised_styles = attachable.override_default_styles?(asset.name)
        asset.data.instance_variable_set("@styles", normalised_styles) if override_default_styles
        asset.data.send(:queue_existing_for_delete)
        asset.data.send(:flush_deletes)
        asset.save # needed to permanently remove file name and urls 
      end
      result
    end
    
    protected
    def extract_id(obj)
      return obj.id unless obj.class == Fixnum || obj.class == String
      obj.to_i if obj.to_i > 0
    end
  end

  # Virtual attribute for the ActionController::UploadedStringIO
  # which consists of these attributes "content_type", "original_filename" & "original_path"
  # content_type: image/png
  # original_filename: 64x16.png
  # original_path: 64x16.png
  attr_accessor :data
    
  include LocusFocus::Acts::PolymorphicPaperclip::InstanceMethods

  include LocusFocus::Acts::PolymorphicPaperclip::ExtentionMethods if options[:with_extention]

  write_inheritable_attribute(:wuid_host, options[:wuid_host]) if options[:wuid_host]

  class_inheritable_reader :wuid_host

end