一尘不染

Django:ModelMultipleChoiceField不选择初始选择

django

ModelMultipleChoiceField没有选择初始选择,并且在我的示例中,我无法进行以下修复

我的模型和表格:

class Company(models.Model):
    company_name = models.CharField(max_length=200)

class Contact(models.Model):
    company = models.ForeignKey(Company)
    first_name = models.CharField(max_length=100)
    last_name = models.CharField(max_length=100)

class Action(models.Model):
    company = models.ForeignKey(Company, blank=True, null=True)
    from_company = models.ManyToManyField(Contact, verbose_name='Participant(s) from "Company"', blank=True, null=True)

class Action_Form(ModelForm):
    from_company = forms.ModelMultipleChoiceField(queryset=Contact.objects.none(), widget=forms.CheckboxSelectMultiple())
    class Meta:
        model = Action

我的工作和结果:

>>> contacts_from_company = Contact.objects.filter(company__exact=1) # "1" for test, otherwise a variable
>>> form = Action_Form(initial={'from_company': [o.pk for o in contacts_from_company]}) # as suggested in the fix
>>> print form['from_company']
<ul>
</ul>
>>> print contacts_from_company
[<Contact: test person>, <Contact: another person>]

>>> form2 = Action_Form(initial={'from_company': contacts_from_company})
>>> print form2['from_company']
<ul>
</ul>

>>> form3 = Action_Form(initial={'from_company': Contact.objects.all()})
>>> print form3['from_company']
<ul>
</ul>

我希望它可以工作的方式:
1.我的视图从request.GET获取“公司”
2.然后过滤该“公司”的所有“联系人”
3.最后,它创建一个表单并将这些“联系人”作为“初始= {…}”

两个问题:
1. [尚未回答]如何使ModelMultipleChoiceField接受那些“初始”值?
2. [已回答]作为替代,我可以将变量传递给Action_Form(ModelForm)以便在我的ModelForm中可以有:

from_company = forms.ModelMultipleChoiceField(queryset=Contact.objects.filter(company__exact=some_id) # where some_id comes from a view

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2020-04-03

共2个答案

一尘不染

你将需要添加一个__init__方法来Action_Form设置初始值,记住要通过super调用__init__ModelForm类。

class Action_Form(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(Action_Form, self).__init__(*args, **kwargs)
        self.fields['from_company'].queryset = Contact.object.filter(...

如果你打算将过滤器参数作为关键字args传递给Action_Form,则需要在调用super之前将其删除:

myfilter = kwargs['myfilter']
del kwargs['myfilter']

或者,可能更好:

myfilter = kwargs.pop('myfilter')
2020-04-03
一尘不染

1.如何使ModelMultipleChoiceField接受那些“初始”值?
这可以在你的Action_Form __init__方法中使用ModelMultipleChoiceField initial属性来完成。

就像在Django源代码(db / models / fields / related.py)中所说的def formfield(self, **kwargs)

        # If initial is passed in, it's a list of related objects, but the
        # MultipleChoiceField takes a list of IDs.

因此,你需要为其提供ID列表:

class Action_Form(forms.ModelForm):
    def __init__(self, *args, **kwargs):
        super(Action_Form, self).__init__(*args, **kwargs)
        self.fields['from_company'].initial = [c.pk for c in Contact.object.filter()]
2020-04-03