Module: Attach::ModelExtension::ClassMethods

Defined in:
lib/attach/model_extension.rb

Instance Method Summary collapse

Instance Method Details

#attachment(name, options = {}, &block) ⇒ Object 



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# File 'lib/attach/model_extension.rb', line 79

def attachment(name, options = {}, &block)
  unless self.reflect_on_all_associations(:has_many).map(&:name).include?(:attachments)
    has_many :attachments, :as => :owner, :dependent => :destroy, :class_name => 'Attach::Attachment'
  end

  if block_given?
    Processor.register(self, name, &block)
  end

  define_method name do
    instance_variable_get("@#{name}") || begin
      attachment = self.attachments.where(:role => name, :parent_id => nil).first
      instance_variable_set("@#{name}", attachment)
    end
  end

  define_method "#{name}_file" do
    instance_variable_get("@#{name}_file")
  end

  define_method "#{name}_file=" do |file|
    instance_variable_set("@#{name}_file", file)
    if file.is_a?(ActionDispatch::Http::UploadedFile)
      @pending_attachments ||= []
      @pending_attachments << {:role => name, :file => file, :options => options}
    else
      nil
    end
  end

  define_method "#{name}_delete" do
    instance_variable_get("@#{name}_delete")
  end

  define_method "#{name}_delete=" do |delete|
    delete = delete.to_i
    instance_variable_set("@#{name}_delete", delete)
    if delete == 1
      @pending_attachment_deletions ||= []
      @pending_attachment_deletions << name
    end
  end
end

#includes_attachments(*options) ⇒ Object 



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# File 'lib/attach/model_extension.rb', line 31

def includes_attachments(*options)
  manipulate do |records|
    if records.empty?
      # Nothing to do
    else
      if options.first.is_a?(Hash)
        options = options.first
      else
        options = options.each_with_object({}) do |role, hash|
          hash[role.to_sym] = []
        end
      end

      options.keys.each do |key|
        if options[key].is_a?(Symbol)
          options[key] = [options[key]]
        end
      end

      root_attachments = {}
      Attachment.where(:owner_id => records.map(&:id), :owner_type => records.first.class.to_s, :role => options.keys).each do |attachment|
        root_attachments[[attachment.owner_id, attachment.role]] = attachment
      end

      child_attachments = {}
      child_roles = options.values.flatten
      Attachment.where(:parent_id => root_attachments.values.map(&:id), :role => child_roles).each do |attachment|
        child_attachments[[attachment.id, attachment.role]] = attachment
      end

      root_attachments.values.each do |attachment|
        options[attachment.role.to_sym].each do |role|
          attachment.instance_variable_set("@cached_children", {}) if attachment.instance_variable_get("@cached_children").nil?
          attachment.instance_variable_get("@cached_children")[role.to_sym] = attachment
        end
      end

      records.each do |record|
        options.keys.each do |role|
          if a = root_attachments[[record.id, role.to_s]]
            record.instance_variable_set("@#{role}", a)
          end
        end
      end
    end
  end
end