关于Dcat admin 动态表单的问题?

用的Dcat admin动态表单,遇到一下问题
1.字段名称不能是同一个, 必须不相同才行,我用的笨方法编辑可以新增不行
2.保存字段提示内容不存在

$type = $form->model()->type;

$form->radio('type')
                ->when(Config::INPUT_TYPE, function (Form $form) use ($type) {
                    $form->textarea($type == Config::INPUT_TYPE ? 'content' : 'content' . Config::INPUT_TYPE);
                })
                ->when(Config::EDITOR_TYPE, function (Form $form) use ($type) {
                    Admin::script(<<<JS
  $('.layui-layer-page').css('z-index', '1');
JS
                    );

                    $form->editor($type == Config::EDITOR_TYPE ? 'content' : 'content' . Config::EDITOR_TYPE);
                })
                ->when(Config::IMAGE_TYPE, function (Form $form) use($type) {
                    $form->image($type == Config::IMAGE_TYPE ? 'content' : 'content' . Config::IMAGE_TYPE)->accept('png,jpeg,jpg')
                        ->maxSize(1024 * 5)
                        ->removable(false)
                        ->retainable()
                        ->uniqueName()
                        ->autoUpload();
                })
                ->options(Config::TYPE_MAPPING)
                ->default(Config::INPUT_TYPE);

            $form->saving(function (Form $form) {

                foreach (Config::TYPE_MAPPING as $k => $item) {
                    $content = $form->{'content'.$k};
                    if ($content) {
                        $form->content = $content;
                        break;
                    }
                }

                $form->deleteInput(['content1','content2', 'content3']);
                dd($form->input());
            });

打印结果

array:7 [
  "key" => "keywords"
  "description" => "seo"
  "type" => "1"
  "_file_" => null
  "_previous_" => "http://test.my_site.com/admin/configs"
  "_token" => "YMBTtTtFWm8QFimCPk5gYavtsU3oJEur3Nr3dJez"
  "content" => "high refractive glass beads,all weather glass beads,MMA resin,liquid reflective film,reflective marking paint supplier"
]

但是还是报

 General error: 1364 Field 'content' doesn't have a default value

各位有什么好办法来实现这个动态表单的设置吗？