File upload field

gistfile1.txt

        self.form_extra_fields = {
                                    'image_file': FileUploadField(label="Upload Image",
                                                                  base_path=self.base_path + "/images",
                                                                  allowed_extensions=['jpg', 'JPG', 'jpeg', 'JPEG'],
                                                                  validators=[validate_image])
                                 }