Django - 以 init 形式更改 min_length？

【问题标题】：Django - change min_length in form __init__?Django - 以 __init__ 形式更改 min_length？
【发布时间】：2012-02-07 17:58:59
【问题描述】：

有什么方法可以在表单构造函数中更改字段的 *min_length* 参数？这不起作用：

def __init__(self, *args, **kwargs):
    super(CreateTeamForm, self).__init__(*args, **kwargs)
    self.fields['primary_color'].min_length = 4

【问题讨论】：

标签： django forms multi-model-forms

【解决方案1】：

尝试在__init__ 方法中设置字段的validators 属性。

from django.core.validators import MinLengthValidator

class MyForm(forms.Form):
    primary_color = forms.CharField()
    def __init__(self, *args, **kwargs):
        super(MyForm, self).__init__(*args, **kwargs)
        # get all the validators on the field which are not MinLengthValidator
        validators = [v for v in self.fields['primary_color'].validators if not isinstance(v, MinLengthValidator)]
        min_length = 10
        validators.append(MinLengthValidator(min_length))
        self.fields['primary_color'].validators = validators

【讨论】：