Form验证

在使用wtforms 的时候，依然需要继承 wtform 针对tornado重写一下里面的一些方法

参考

from wtforms.ext.i18n.form import Form as wtFormclass Form(wtForm):    """    Using this Form instead of wtforms.Form    Example::        class SigninForm(Form):            email = EmailField('email')            password = PasswordField('password')        class SigninHandler(RequestHandler):            def get(self):                form = SigninForm(self.request.arguments)    """    LANGUAGES = ['zh']    def __init__(self, formdata=None, obj=None, prefix='', **kwargs):        super(Form, self).__init__(formdata, obj, prefix, **kwargs)    def process(self, formdata=None, obj=None, **kwargs):        if formdata is not None and not hasattr(formdata, 'getlist'):            formdata = TornadoArgumentsWrapper(formdata)        super(Form, self).process(formdata, obj, **kwargs)class TornadoArgumentsWrapper(dict):    def __getattr__(self, key):        try:            return self[key]        except KeyError:            #raise AttributeError            return None    def __setattr__(self, key, value):        self[key] = value    def __delattr__(self, key):        try:            del self[key]        except KeyError:            raise AttributeError    def getlist(self, key):        try:            values = []            for v in self[key]:                v = to_unicode(v)                #if isinstance(v, unicode):                v = re.sub(r"[\x00-\x08\x0e-\x1f]", " ", v)                values.append(v)            return values        except KeyError:            #raise AttributeError            return []

这里的基类用的是i18n的，目地是为了让wtforms的内制验证错误能本地化

LANGUAGES = ['zh']

初始化Form的时候，传入 tornado 的 request.arguments,

像这样

class LoginForm(Form):    name = TextField('user', [Required('用户名不能为空'), ])    pwd = PasswordField('pwd', [Required('密码不能为空'), ])    remember = BooleanField('rem')

form = LoginForm(self.request.arguments)

取 数据 可以: name = form.name.data

error的话: form.name.error