Module: GridAttachment::Mongomatic::ClassMethods

Defined in:
lib/grid_attachment/mongomatic.rb

Instance Method Summary collapse

Instance Method Details

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

Declare an attachment for the object

eg: attachment :image



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# File 'lib/grid_attachment/mongomatic.rb', line 31

def attachment(name,options={})
  prefix = options[:prefix] ||= :grid

  ##
  # Add this name to the attachment_types
  attachment_types.push(name).uniq!

  ##
  # Return the Grid object.
  # eg: image.filename, image.read
  define_method(name) do
    grid.get(self["#{name}_id"]) if self["#{name}_id"]
  end

  ##
  # Create a method to set the attachment
  # eg: object.image = File.open('/tmp/somefile.jpg')
  define_method("#{name}=") do |file|
    # delete the old file if it exists
    unless self["#{name}_id"].blank?
      send(:delete_attachment, name, self["#{name}_id"])
    end
    case
    when file.is_a?(Hash) && file[:tempfile]
      send(:create_attachment, name, file)
    when file.respond_to?(:read)
      send(:create_attachment, name, file)
    end
  end

  ##
  # Create a method to set the attachment for binary string.
  # eg: object.set_image(binary_string, "generated_filename.png")
  define_method("set_#{name}") do |binary, filename|
    if !binary.nil?
      send(:create_attachment_raw, name, binary, filename)
    else
      send(:delete_attachment, name, self["#{name}_id"])
    end
  end

  ##
  # Unset the attachment, queue for removal
  define_method("unset_#{name}") do
    send(:delete_attachment, name, self["#{name}_id"])
  end

  ##
  # Return the relative URL to the attachment for use with Rack::Grid
  # eg: /grid/4ba69fde8c8f369a6e000003/somefile.png
  define_method("#{name}_url") do
    _id   = self["#{name}_id"]
    _name = self["#{name}_name"]
    URI.escape(["/#{prefix}", _id, _name].join('/')) if _id && _name
  end

  ##
  # Return the relative URL to the thumbnail for use with Rack::GridThumb
  # eg: /grid/4ba69fde8c8f369a6e000003/somefile_50x.png
  define_method("#{name}_thumb") do |thumb|
    _id   = self["#{name}_id"]
    _name = self["#{name}_name"]
    _ext  = File.extname(_name)
    _base = File.basename(_name,_ext)
    _name = "#{_base}_#{thumb}#{_ext}"
    URI.escape(["/#{prefix}", _id, _name].join('/')) if _id && _name
  end
end

#attachment_types ⇒ Object

All the attachments types for this class



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# File 'lib/grid_attachment/mongomatic.rb', line 108

def attachment_types
  @attachment_types ||= []
end

#grid ⇒ Object

Accessor to Grid



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# File 'lib/grid_attachment/mongomatic.rb', line 102

def grid
  @grid ||= Mongo::Grid.new(::Mongomatic.db)
end