Module: SimplyCouch::HasAttachment::ClassMethods

Defined in:
lib/simply_couch/has_attachment.rb

Instance Method Summary collapse

Instance Method Details

#attachment_registry ⇒ Object

Registry of all attachments defined on this class



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# File 'lib/simply_couch/has_attachment.rb', line 220

def attachment_registry
  @_has_attachment_registry ||= {}
end

#has_attachment(name, styles: {}, default_url: nil, default_style: :original) ⇒ Object 



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# File 'lib/simply_couch/has_attachment.rb', line 91

def has_attachment(name, styles: {}, default_url: nil, default_style: :original)
  # Auto-declare CouchDB properties for attachment metadata
  property :"#{name}_file_name"
  property :"#{name}_content_type"
  property :"#{name}_file_size", type: Integer
  property :"#{name}_updated_at", type: Time

  # Register configuration
  attachment_registry[name] = {
    styles: styles,
    default_url: default_url,
    default_style: default_style,
  }

  # ---- Setter: model.file = uploaded_file ----
  define_method(:"#{name}=") do |uploaded|
    # Handle clearing: nil, empty string
    if uploaded.nil? || (uploaded.respond_to?(:empty?) && uploaded.empty?)
      send(:"#{name}_file_name=", nil)
      send(:"#{name}_content_type=", nil)
      send(:"#{name}_file_size=", nil)
      send(:"#{name}_updated_at=", nil)
      return
    end

    config = self.class.attachment_registry[name]

    # Extract file info
    original_filename = if uploaded.respond_to?(:original_filename)
                          uploaded.original_filename
                        elsif uploaded.respond_to?(:path)
                          File.basename(uploaded.path)
                        else
                          "file"
                        end
    ext = File.extname(original_filename)
    ext = ".bin" if ext.blank?

    content_type = uploaded.respond_to?(:content_type) ? uploaded.content_type : nil
    file_size    = uploaded.respond_to?(:size) ? uploaded.size : nil

    # Read content (handle multiple upload types)
    content = if uploaded.respond_to?(:read)
                data = uploaded.read
                uploaded.rewind if uploaded.respond_to?(:rewind)
                data
              elsif uploaded.respond_to?(:path) && File.exist?(uploaded.path)
                File.binread(uploaded.path)
              elsif uploaded.respond_to?(:tempfile)
                uploaded.tempfile.read
              else
                uploaded.to_s
              end

    # Build storage path
    record_id = respond_to?(:id) && id.present? ? id.to_s : "tmp"
    base_dir = Rails.root.join("public", "system", name.to_s, record_id)
    FileUtils.mkdir_p(base_dir)

    begin
      # Write original file
      original_path = base_dir.join("original#{ext}")
      File.binwrite(original_path, content)

      # Generate thumbnail styles
      config[:styles].each do |style_name, geometry|
        style_path = base_dir.join("#{style_name}#{ext}")
        begin
          image = MiniMagick::Image.open(original_path.to_s)
          image.resize(geometry)
          image.write(style_path.to_s)
        rescue StandardError => e
          # If ImageMagick fails, copy original as fallback
          Rails.logger.warn(
            "[HasAttachment] Could not generate #{style_name} for #{name}: #{e.message}"
          )
          FileUtils.cp(original_path, style_path)
        end
      end

      # Store metadata as CouchDB properties
      send(:"#{name}_file_name=", original_filename)
      send(:"#{name}_content_type=", content_type)
      send(:"#{name}_file_size=", file_size || content.bytesize)
      send(:"#{name}_updated_at=", Time.current)
    rescue StandardError => e
      errors.add(name, "could not be processed: #{e.message}")
      Rails.logger.error("[HasAttachment] Error processing #{name}: #{e.message}")
    end
  end

  # ---- Getter: model.file → Proxy ----
  define_method(name) do
    Proxy.new(self, name)
  end

  # ---- URL helper: model.file_url(:thumb) ----
  define_method(:"#{name}_url") do |style_name = nil|
    config = self.class.attachment_registry[name]
    style_name ||= config[:default_style]

    fname = send(:"#{name}_file_name")
    if fname.blank?
      return config[:default_url] if config[:default_url]
      return nil
    end

    ext = File.extname(fname)
    record_id = respond_to?(:id) && id.present? ? id.to_s : "tmp"

    "/system/#{name}/#{record_id}/#{style_name}#{ext}"
  end

  # ---- Backward compat: *_path for Paperclip migrations ----
  define_method(:"#{name}_path") do |style_name = nil|
    config = self.class.attachment_registry[name]
    style_name ||= config[:default_style]

    fname = send(:"#{name}_file_name")
    return nil if fname.blank?

    ext = File.extname(fname)
    record_id = respond_to?(:id) && id.present? ? id.to_s : "tmp"

    Rails.root.join("public", "system", name.to_s, record_id, "#{style_name}#{ext}").to_s
  end
end