public static ScopedHtmlHelper <TPostModel> FormFor <TViewModel, TPostModel>(this HtmlHelper <TViewModel> helper, TPostModel postModel, Action <FormTag> mutator = null)
{
var form = new FormTag();
form.AddClasses("sg-form").NoClosingTag();
if (mutator != null)
{
mutator(form);
}
helper.ViewContext.Writer.Write(form.ToHtmlString());
return(helper.ForModel(postModel, () =>
{
helper.ViewContext.Writer.Write($"</{form.TagName()}>");
}));
}