Renaming to CouchRest Model

Refactored basic directory structure.
Moved to ActiveSupport for Validations and Callbacks.
Cleaned up older code, and removed support for text property types.

lib/couchrest/model/extended_attachments.rb

@@ -0,0 +1,73 @@
+module CouchRest
+  module Model
+    module ExtendedAttachments
+
+      # Add a file attachment to the current document. Expects
+      # :file and :name to be included in the arguments.
+      def create_attachment(args={})
+        raise ArgumentError unless args[:file] && args[:name]
+        return if has_attachment?(args[:name])
+        self['_attachments'] ||= {}
+        set_attachment_attr(args)
+      rescue ArgumentError => e
+        raise ArgumentError, 'You must specify :file and :name'
+      end
+
+      # reads the data from an attachment
+      def read_attachment(attachment_name)
+        database.fetch_attachment(self, attachment_name)
+      end
+
+      # modifies a file attachment on the current doc
+      def update_attachment(args={})
+        raise ArgumentError unless args[:file] && args[:name]
+        return unless has_attachment?(args[:name])
+        delete_attachment(args[:name])
+        set_attachment_attr(args)
+      rescue ArgumentError => e
+        raise ArgumentError, 'You must specify :file and :name'
+      end
+
+      # deletes a file attachment from the current doc
+      def delete_attachment(attachment_name)
+        return unless self['_attachments']
+        self['_attachments'].delete attachment_name
+      end
+
+      # returns true if attachment_name exists
+      def has_attachment?(attachment_name)
+        !!(self['_attachments'] && self['_attachments'][attachment_name] && !self['_attachments'][attachment_name].empty?)
+      end
+
+      # returns URL to fetch the attachment from
+      def attachment_url(attachment_name)
+        return unless has_attachment?(attachment_name)
+        "#{database.root}/#{self.id}/#{attachment_name}"
+      end
+      
+      # returns URI to fetch the attachment from
+      def attachment_uri(attachment_name)
+        return unless has_attachment?(attachment_name)
+        "#{database.uri}/#{self.id}/#{attachment_name}"
+      end
+      
+      private
+      
+        def get_mime_type(path)
+          return nil if path.nil?
+          type = ::MIME::Types.type_for(path)
+          type.empty? ? nil : type.first.content_type
+        end
+
+        def set_attachment_attr(args)
+          content_type = args[:content_type] ? args[:content_type] : get_mime_type(args[:file].path)
+          content_type ||= (get_mime_type(args[:name]) || 'text/plain')
+          self['_attachments'][args[:name]] = {
+            'content_type' => content_type,
+            'data'         => args[:file].read
+          }
+        end
+      
+    end # module ExtendedAttachments
+  end
+end