db = DAL("sqlite://storage.db")

db.define_table('comment',
   Field('file', 'upload', requires=[IS_NOT_EMPTY(error_message="Please select a file to upload"), IS_UPLOAD_FILENAME(extension='ta', error_message="Must be a Turtle Art file")]),
   Field('title', requires=[IS_NOT_EMPTY(error_message="You must include a title"), IS_NOT_IN_DB(db, 'comment.title', error_message="Title is already taken")]),
   Field('image_id'),
   Field('creator', requires=IS_NOT_EMPTY(error_message="You must include your name")),
   Field('description', 'text'),
   Field('newimage'))