Django 'QuerySet' 对象没有使用 modelform 的属性'split'

Question

我无法让我的视图更新多对多字段。提交表单后返回。

Traceback:
File "/usr/local/lib/python2.7/dist-packages/django/core/handlers/base.py" in get_response
  111.                         response = callback(request, *callback_args, **callback_kwargs)
File "/home/footbook/Ubuntu One/webapps/fb/poc/../poc/activity/views.py" in activity_save_page
  44.             group_names = form.cleaned_data['groups'].split()

Exception Type: AttributeError at /activity_save/
Exception Value: 'QuerySet' object has no attribute 'split'

这里是文件。 模型.py

class Group (models.Model):
    group_nm = models.CharField(max_length=64)
    group_desc = models.CharField(max_length=250)
    created = models.DateTimeField(auto_now_add=True)
    active_yn = models.BooleanField(default=True)
    def __unicode__(self):
        return self.group_nm



class Activity(models.Model):
    activity_nm = models.CharField(max_length=60)  
    activity_desc = models.CharField(max_length=250)
    startdt = models.DateField()
    enddt = models.DateField()
    crdt = models.DateTimeField(auto_now_add=True,editable=False)
    groups =  models.ManyToManyField(Group)
    upddt = models.DateTimeField(editable=False)
    def  save(self, *args, **kwargs):
        if not self.id:
            self.crdt = datetime.date.today()
        self.upddt = datetime.datetime.today()
        super(Activity, self).save(*args, **kwargs)
    def __unicode__(self):
        return self.name     

forms.py

def make_custom_datefield(f):
    formfield = f.formfield()
    if isinstance(f, models.DateField):
        formfield.widget.format = '%m/%d/%Y'
        formfield.widget.attrs.update({'class':'datePicker', 'readonly':'true'})
    return formfield


class ActivitySaveForm(forms.ModelForm):
    formfield_callback = make_custom_datefield
    def __init__(self, *args, **kwargs):
        super(ActivitySaveForm, self).__init__(*args, **kwargs)
        self.fields['activity_nm'].label = "Activity Name"
        self.fields['activity_desc'].label = "Describe It"
        self.fields['startdt'].label = "Start Date"
        self.fields['enddt'].label = "End Date"
        self.fields['groups'].label ="Group"
    class Meta:
        model = Activity

views.py

def activity_save_page(request):
    if request.method == 'POST':
        form = ActivitySaveForm(request.POST)
        if form.is_valid():
            act, created = Activity.objects.get_or_create(
                activity_nm = form.cleaned_data['activity_nm']
            )
            act.activity_desc = form.cleaned_data['activity_desc']
            if not created:
                act.group_set.clear()
            group_names = form.cleaned_data['groups'].split()
            for group_name in group_names:
                group, dummy = Group.objects.get_or_create(group_nm=group_name)
                act.group_set.add(group)
            act.save()
            return HttpResponseRedirect('/activity/')
    else:
        form = ActivitySaveForm()
    variables = RequestContext(request, {
        'form': form
    })
    return render_to_response('activity_save.html', variables)

我认为如果我不使用模型表单它会起作用，但我需要它来实现this datepicker. 因为它是一个多对多字段，我想在它们输入数据库时​​将它们拆分，但我的查询集失败了。我试过用很多不同的方式改变它，但我被卡住了。我见过很多类似的问题，但它们要么有外键，要么没有模型形式。

谢谢。

编辑： activity_save.html

{% extends "base.html" %}
{% block title %}Save Activity{% endblock %}
{% block head %}Save Activty{% endblock %}
<input class="datePicker" readonly="true" type="text" id="id_startdt" />
<input class="datePicker" readonly="true" type="text" id="id_enddt" />
{% block content %}


<form action="{% url activity.views.activity_save_page act_id%}" method="post">{% csrf_token %}

{{ form.as_p }} 

<input type="submit" value="save it" />
</form>
{% endblock %}

Answer 1

正如错误描述的那样：QuerySet 没有split 方法。你不能打电话给my_qs.split()。

form.cleaned_data['groups'] 返回清理数据；它已经为您处理了字符串到python对象的形式转换，在ManyToManyField的情况下，最终由python中的QuerySet表示。

日期字段返回日期对象，IntegerField 一个整数，CharFields 一个字符串，等等。通过表单清理以相同的方式。

如果您想要group_names 的列表，您需要显式地遍历QuerySet 中的对象并提取它们的group_nm 属性。

            group_names = [x.group_nm for x in form.cleaned_data['groups']]

Answer 2

我不确定您是否需要按照您的观点执行所有这些操作。您可以直接将表单保存在视图中，而无需手动创建对象并对其进行操作。

另外，您需要获取活动的 id，以便您可以更新现有活动实例。

更新urls.py 以使这些网址具有act_id：

url(r'^activity_app/save/(?P<act_id>\d+)/$', 'activity_app.views.activity_save_page'),
url(r'^activity_app/save/$', 'activity_app.views.activity_save_page'),

我会将视图更改为：

def activity_save_page(request, act_id=None):
    act_inst = None
    try:
        if act_id:
           act_inst = Activity.objects.get(id=act_id)
    except Exception:
        pass
    if request.method == 'POST':
        form = ActivitySaveForm(request.POST, instance=act_inst)
        if form.is_valid():
            return HttpResponseRedirect('/activity/')
    else:
        form = ActivitySaveForm(instance=act_inst)
    variables = RequestContext(request, {
        'form': form
        })
    return render_to_response('activity_save.html', variables)