formset并为每个外键输入文本 [英] formset and input text for each foreign key

问题描述

在我的 django formset 中，我试图用外键 >输入而不是选择：

 类MinAttend（models.Model）：
 act = models.ForeignKey（Act）
 country = models.ForeignKey（Country）
 verbatim = models.ForeignKey（verbatim）
 def __unicode __（self）：
 return u％s％self.verbatim 
 $ b $ class MinAttendForm（forms.ModelForm）：
 country = forms.ModelChoiceField（queryset = Country.objects .all（），empty_label =选择一个国家）
 status = forms.ModelChoiceField（queryset = Status.objects.values_list（'status'，flat = True）.distinct（），empty_label =选择一个状态）
 verbatim = forms.CharField（max_length = 300）
 
类Meta：
模型= MinAttend 
用于验证和订单的字段
 fields =（'country'，'status'，'verbatim'）
  

ld，我有一个输入框，而不是一个选择，但是当我想更新一个formset，我有逐字id而不是相应的文本：

这里是我如何初始化表单：


$ < MinAttendForm
nb_extra_forms = 3
$ b $ def post（self，request，* args，** kwargs）：
attendances = MinAttend.objects.filter（...）
＃设置表格的数量到部长的数量+ 3额外的表格来填充，如果需要的话
MinAttendFormSet = modelformset_factory（self.model，form = self.form_class，extra = len（attendances），max_num = len（attendance ）+ self.nb_extra_forms，can_delete = True）
formset = MinAttendFormSet（queryset = attendances）

我试过两件事：

而不是th最后一行我有以下代码：

$ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $ $＃
initials.append（{verbatim：attendances [index] .verbatim.verbatim}）
打印首字母缩写，首字母缩写
formset = MinAttendFormSet（queryset = attendances，initial = initials）

我重写了 init 形式的方法：

 ＃〜＃verbatim text，而不是id 
 def __init __（self，* args，** kwargs）：
 super（MinAttendForm，self）.__ init __（* args，** kwargs）
 instance = kwargs.get（instance ，None）
 if instance！= None：
 printinstance，instance.verbatim.verbatim 
 self.fields [verbatim]。initial = instance.verbatim.verbatim 
  

这些方法都不起作用，我仍然得到数字而不是文本！奇怪的是，我确实在逐字字段中看到了文本，但是只有三种额外的形式。正常？

编辑 - 从Bernd Jerzyna评论

在表格中：

  from django.forms.models import BaseModelFormSet 
 
 class MinAttendFormSet（BaseModelFormSet）：
 def __init __（ 
 super（MinAttendFormSet，self）.__ init __（* args，** kwargs）
 for self.forms中的表单：
 #skip extra forms $（$ args，** kwargs） b $ b如果不是form.empty_permitted：
 form.fields ['verbatim']。initial = form.instance.verbatim 
 printverbatim MinAttendFormSet，form.instance.verbatim 
  

在我的视图中：

<$ p $从表单中导入MinAttendForm，MinAttendFormSet
my_formset = modelformset_factory（self.model，form = self.form_class，formset = MinAttendFormSet）
formset = my_formset（request.POST，queryset =出勤）


当我做每个版本的文本打印巴蒂姆，我看到正确的文字显示。但是，我仍然看到我的网页形式的数字（主键ids）;（。



有什么不对？

作为选择小部件，逐字显示与 __ unicode __ 结果，但是幕后的值是PK / verbatim-id，即 HTML < option> ; 标签有一个值和'label'，当你把它改成一个文本输入部件时，期望你输入PK，所以为什么你看到数字。
$ b

对于解决方案，我不确定，你可以写一些代码来接受逐字文本，而不是pk / verbatim-id，但是这个问题是，如果文本django不会找到匹配，而且，如果超过1个逐字文本具有相同的文本，django将不知道要使用哪一个（除非您已经设置了 unique = true ）。也可以将逐字文本设置为PK。

也许使用类似于 Django-Select2 会给你想要的用户界面吗？

In my django formset, I am trying to display a foreign key field with an input instead of a select:

class MinAttend(models.Model):
    act = models.ForeignKey(Act)
    country = models.ForeignKey(Country)
    verbatim = models.ForeignKey(Verbatim)
    def __unicode__(self):
        return u"%s" % self.verbatim

class MinAttendForm(forms.ModelForm):
    country=forms.ModelChoiceField(queryset=Country.objects.all(), empty_label="Select a country")
    status=forms.ModelChoiceField(queryset=Status.objects.values_list('status', flat = True).distinct(), empty_label="Select a status")
    verbatim=forms.CharField(max_length=300)

    class Meta:
        model=MinAttend
        #fields used for the validation and order
        fields = ('country', 'status', 'verbatim')

For the verbatim field, I do have an input box instead of a select but when I want to update a formset, I have the verbatim id instead of its corresponding text:

Here is how I initialize the form:

class MinAttendUpdate(UpdateView):
    object=None
    model = MinAttend
    form_class=MinAttendForm
    nb_extra_forms=3

    def post(self, request, *args, **kwargs):
        attendances=MinAttend.objects.filter(...)
        #set the number of forms to the number of ministers + 3 extra form to fill if needed
        MinAttendFormSet = modelformset_factory(self.model, form=self.form_class, extra=len(attendances), max_num=len(attendances)+self.nb_extra_forms, can_delete=True)
        formset=MinAttendFormSet(queryset=attendances)

I have tried two things:

Instead of the last line I have the following code:

initials=[]
#display text of verbatim instead of id
for index in range(len(attendances)):
    initials.append({"verbatim": attendances[index].verbatim.verbatim})
print "initials", initials
formset=MinAttendFormSet(queryset=attendances, initial=initials)

I have overridden the init method of the form:

#~ #verbatim text instead of id for the verbatim field
def __init__(self, *args, **kwargs):
    super(MinAttendForm, self).__init__(*args, **kwargs)
    instance = kwargs.get("instance", None)
    if instance!=None:
        print "instance", instance.verbatim.verbatim
        self.fields["verbatim"].initial = instance.verbatim.verbatim

None of these methods works, I still get numbers instead of text! What is curious is that I do see text for the verbatim field but only for the three extra forms. Normal?

EDIT - from Bernd Jerzyna comment

In my form:

from django.forms.models import BaseModelFormSet

class MinAttendFormSet(BaseModelFormSet):
    def __init__(self, *args, **kwargs):
        super(MinAttendFormSet, self).__init__(*args, **kwargs)
        for form in self.forms:
            #skip extra forms
            if not form.empty_permitted:
                form.fields['verbatim'].initial= form.instance.verbatim
                print "verbatim MinAttendFormSet", form.instance.verbatim

In my view:

from forms import MinAttendForm, MinAttendFormSet
my_formset = modelformset_factory(self.model, form=self.form_class, formset=MinAttendFormSet)
formset = my_formset(request.POST, queryset=attendances)

When I do a print of the text of each verbatim, I see the correct text displayed. However, I still see numbers (primary key ids) in the form of my web page ;(.

What's wrong?

解决方案

This is my understanding of it...

As a select widget, the verbatim is displayed with the __unicode__ results, but the value 'behind the scenes' is the PK/verbatim-id, ie the HTML <option> tag has a value and 'label'. When you change it to a text input widget, it is expecting you to enter the PK, hence why you are seeing the numbers.

For the solution, I am not sure. You could write some code to accept the verbatim-text, rather than the pk/verbatim-id. The problem with this though, is that if the text is not written exactly, django won't find a match. Also, if more than 1 verbatim has the same text, django wouldn't know which one to use (unless you have set unique=true on the model field for text). You could also set the verbatim-text as the PK.

Perhaps using something like Django-Select2 will give you the desired UI?

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