python - Django 无法识别 forms.Form 子项上的关键字空白

Question

我正在尝试创建一个表单，该表单将在其某些值中接收空字符串。此表单不受模型对象支持。我这样定义它:

class SearchForm(forms.Form):
    device = fields.CharField(blank=True)
    min_release_date = fields.CharField(blank=True)
    price_range = fields.CharField(blank=True)
    has_in_app_purchases = fields.CharField(blank=True)

除非我尝试运行测试:

def test_valid_no_data(self):
    from webanalytics.web.search import ANY_PRICE, DEFAULT_DATES, HAS_IAP_IDS
    form_data = {
        'price_range': ANY_PRICE[0],
        'min_release_date': DEFAULT_DATES[0],
        'has_in_app_purchases': HAS_IAP_IDS[0]
    }
    search = SearchForm(form_data)
    self.assertTrue(search.is_valid())

我得到以下异常:

ERROR: Failure: TypeError (__init__() got an unexpected keyword argument 'blank')
----------------------------------------------------------------------
Traceback (most recent call last):
  File "/usr/local/lib/python2.7/dist-packages/nose/loader.py", line 411, in loadTestsFromName
    addr.filename, addr.module)
  File "/usr/local/lib/python2.7/dist-packages/nose/importer.py", line 47, in importFromPath
    return self.importFromDir(dir_path, fqname)
  File "/usr/local/lib/python2.7/dist-packages/nose/importer.py", line 94, in importFromDir
    mod = load_module(part_fqname, fh, filename, desc)
  File "/workspace/aa/tests/ci/unit/webanalytics/web/test_forms.py", line 5, in <module>
    from webanalytics.forms import SearchForm
  File "/workspace/aa/webanalytics/forms.py", line 8, in <module>
    class SearchForm(forms.Form):
  File "/workspace/aa/webanalytics/forms.py", line 15, in SearchForm
    device = fields.CharField(blank=True)
  File "/usr/local/lib/python2.7/dist-packages/django/forms/fields.py", line 187, in __init__
    super(CharField, self).__init__(*args, **kwargs)
TypeError: __init__() got an unexpected keyword argument 'blank'

根据文档，这应该没问题。我错过了什么吗？

Answer 1

这是因为 Django 表单字段不接受 blank 参数。

core parameters Django 表单字段接受的是:

• 必须

• 标签

• 标签后缀

• 初始

• 小工具

• 帮助文本

• 错误消息

• 验证者

• 本地化

  您可以传递一个 required 参数，其值为 False。因此，如果您传递一个空值——None 或空字符串 ""，表单将不会引发验证错误。