WTForms未验证类型

Question

我试图使用wtforms来检查字典中的数据是否符合所需的类型。在下面的示例中，我希望确保字典中的some_field是一个整数。文档让我相信，如果我使用IntegerField，数据将被强制为整数，StringField将强制字符串，等等。然而，即使some_field的类型不是整数，foo.validate()仍然返回True。这是预期的行为吗?为什么？如果是预期的行为，是否可以使用wtforms按需要进行类型验证？

>>> from wtforms import Form, IntegerField, validators

>>> class Foo(Form):
...     some_field = IntegerField(validators=[validators.Required()])

>>> foo = Foo(**{'some_field':'some text input'})

>>> foo.data
{'some_field': 'some text input'}

>>> foo.validate()
True

>>> IntegerField?
Type:            type
String form:     <class 'wtforms.fields.core.IntegerField'>
File:            c:\users\appdata\local\continuum\anaconda\envs\env\lib\site-packages\wtforms\fields\core.py
Init definition: IntegerField(self, label=None, validators=None, **kwargs)
Docstring:
A text field, except all input is coerced to an integer.  Erroneous input
is ignored and will not be accepted as a value.

Answer 1

数据需要传递给表单的formdata参数，以强制类型强制。为了将数据传递给formdata，请使用MultiDict。

In [2]: from wtforms import Form, IntegerField, validators

In [3]: class Foo(Form):
   ...:     some_field = IntegerField(validators=[validators.Required()])

In [4]: from werkzeug.datastructures import MultiDict

In [5]: foo = Foo(formdata=MultiDict({'some_field':'some text input'}))

In [6]: foo.data
Out[6]: {'some_field': None}

In [7]: foo.validate()
Out[7]: False

感谢Max在评论中指出了这个链接的答案和更多细节：WTForms: IntegerField skips coercion on a string value