IntegerField和必需的验证器不直观？总是要求？

Question

当我使用wtforms.IntegerField带required验证器时,我只收到消息"此字段是必需的".

另一方面,它似乎IntegerField只能被要求,我不应该使用必需的验证器.

这里的逻辑是什么？这个字段只是添加一个整数验证器是否有意义,它仍然可以用作必填字段(但必须是int)或不是必需字段？

只是想在这里发现一些模式.

更新:

• WTForms版本是 __version__ = '1.0.5'
• Flask_WTF版本是 __version__ = '0.9.3'

形成

class OrderForm(Form):
    order_number = wtforms.IntegerField('Order Number', validators=[validators.Required()])

视图

    def render_response(self):
        ctx = {}
        order_form = OrderForm()
        ctx['order_form'] = order_form

        if order_form.validate_on_submit(): pass
            # stuff.
        return render_template('support/warranty_form.html', **ctx)

模板

{% macro render_field(field) %}
    <div class="form-field-wrapper">
        <div class="form-field">
            {{ field(**kwargs) }}
        </div>
        {{ render_field_errors(field) }}
    </div>
{% endmacro %}

{{ render_field(order_form.order_number, placeholder="ORDER NUMBER") }}

如果我删除了所需的验证器,我的表单仍然需要该值.

我刚刚在文本字段上使用了自定义验证器.

Answer 1

问题#14可能会让您感兴趣.用户希望尝试创建"NullableIntegerField".提出的一个想法是使用可选的验证器.您可以在下面的脚本中看到它的工作原理:

from werkzeug import MultiDict
from wtforms import Form, IntegerField, validators

class MyDefaultForm(Form):
    my_field = IntegerField('My Field')

class MyRequiredForm(Form):
    my_field = IntegerField('My Field', [validators.required()])

class MyOptionalForm(Form):
    my_field = IntegerField('My Field', [validators.optional()])

input_data = MultiDict({
    'my_field' : ''
})

default_form = MyDefaultForm(input_data)
required_form = MyRequiredForm(input_data)
optional_form = MyOptionalForm(input_data)

print 'Default Form Validation: {0}'.format(default_form.validate())
print 'Default Form Errors: {0}'.format(default_form.errors)
print 'Default Data: {0}'.format(default_form.data)
print

print 'Required Form Validation: {0}'.format(required_form.validate())
print 'Required Form Errors: {0}'.format(required_form.errors)
print 'Required Data: {0}'.format(required_form.data)
print

print 'Optional Form Validation: {0}'.format(optional_form.validate())
print 'Optional Form Errors: {0}'.format(optional_form.errors)
print 'Optional Data: {0}'.format(optional_form.data)
print

结果:

Default Form Validation: False
Default Form Errors: {'my_field': [u'Not a valid integer value']}
Default Data: {'my_field': None}

Required Form Validation: False
Required Form Errors: {'my_field': [u'This field is required.']}
Required Data: {'my_field': None}

Optional Form Validation: True
Optional Form Errors: {}
Optional Data: {'my_field': None}

我用整数字段创建三个表单.一个没有验证器,一个带有所需的验证器,另一个带有可选的验证器.您可能希望使用可选的验证器,以便结果为None.