Django形成错误'为关键字参数'选择'获得了多个值''

Question

定义我的django表单时出现一个奇怪的错误.我收到错误:

__init__() got multiple values for keyword argument 'choices'

这种情况发生在TestForm和SpeciesForm上(引用如下); 基本上两种形式都带有'choices'关键字参数.永远不会显式调用init(),甚至还没有在视图中实例化表单.有一个ModelForm和一个普通Form.

from django import forms as f
from orders.models import *

class TestForm(f.Form):
    species = f.ChoiceField('Species', choices=Specimen.SPECIES)
    tests = f.MultipleChoiceField('Test', choices=Test.TESTS, widget=f.CheckboxSelectMultiple())
    dna_extraction = f.CharField('DNA extraction', help_text='If sending pre-extracted DNA, we require at least 900 ng')

class SpeciesForm(f.ModelForm):
    TYPE_CHOICES = (
        ('blood', 'Blood'),
        ('dna', 'Extracted DNA'),
    )
    dam_provided = f.BooleanField('DAM', help_text='Is dam for this specimen included in sample shipment?')
    sample_type = f.ChoiceField('Type of sample', choices=TYPE_CHOICES)
    dna_concentration = f.CharField('DNA concentration', help_text='If sending extracted DNA, approximate concentration')

    class Meta:
        exclude = ['order']
        model = Specimen

任何帮助,将不胜感激.不知道为什么会发生这种情况,因为表格非常简单.

Answer 1

http://code.djangoproject.com/browser/django/trunk/django/forms/fields.py#L647

647     def __init__(self, choices=(), required=True, widget=None, label=None,
648                  initial=None, help_text=None, *args, **kwargs):
649         super(ChoiceField, self).__init__(required=required, widget=widget, label=label,
650                                         initial=initial, help_text=help_text, *args, **kwargs)

使用:

species = f.ChoiceField(label='Species', choices=Specimen.SPECIES)
tests = f.MultipleChoiceField(label='Test', choices=Test.TESTS, widget=f.CheckboxSelectMultiple())

和:

sample_type = f.ChoiceField(label='Type of sample', choices=TYPE_CHOICES)

这假设您的选择有效.不确定Specimen.SPECIES和Test.TESTS是什么.那些应该是可以迭代的两元组根据:

ChoiceField.choices

2元组的可迭代(例如,列表或元组),用作此字段的选项.此参数接受与模型字段的choices参数相同的格式.有关详细信息,请参阅有关选项的模型字段参考文档.