Tornado Web 开发 框架搭建 (3)

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http://lepture.com/work/tornado-ext

from wtforms.ext.i18n.form import Form as wtForm
class 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']

Form类里面也需要加上这句话，基本报错信息会变成中文的

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)

之后调用 form.validate() 验证结果就出来了。

取 数据 可以: name = form.name.data

error的话: form.name.error