couchrest_model/lib/couchrest/mixins/extended_attachments.rb

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module CouchRest
module Mixins
module ExtendedAttachments
# creates a file attachment to the current doc
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)
Base64.decode64(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 encode_attachment(data)
::Base64.encode64(data).gsub(/\r|\n/,'')
end
def get_mime_type(file)
::MIME::Types.type_for(file.path).empty? ?
'text\/plain' : MIME::Types.type_for(file.path).first.content_type.gsub(/\//,'\/')
end
def set_attachment_attr(args)
content_type = args[:content_type] ? args[:content_type] : get_mime_type(args[:file])
self['_attachments'][args[:name]] = {
'content_type' => content_type,
'data' => encode_attachment(args[:file].read)
}
end
end # module ExtendedAttachments
end
end