我正在创建一个包含Person和Membership的Group模型,所有这些都在Django docs中描述。
class Person(models.Model):
name = models.CharField(max_length=128)
def __str__(self):
return self.name
class Group(models.Model):
name = models.CharField(max_length=128)
members = models.ManyToManyField(Person, through='Membership')
def __str__(self):
return self.name
class Membership(models.Model):
person = models.ForeignKey(Person)
leader = models.BooleanField(default=False)
group = models.ForeignKey(Group)
我只是将这一切都放在视图中,因为我想在我的网络应用程序中将这个“创建组”作为一个功能。
views.py:
@login_required
def groups(request):
user = request.user
if request.method == "POST":
form = GroupForm(request.POST)
if form.is_valid():
formm = form.save(commit=False)
g = Group.objects.create(name = formm.name)
p = Person.objects.create(name=request.user)
m = Membership.objects.create(person=p, group=g, leader=True)
gr = Group.objects.all()
per = Person.objects.all()
mem = Membership.objects.all()
context = {
'gr': gr,
'per':per,
'mem':mem,
'form': form,
}
return render(request, 'groups.html', context )
else:
gr = Group.objects.all()
per = Person.objects.all()
mem = Membership.objects.all()
form = GroupForm()
context = {
'gr': gr,
'per':per,
'mem':mem,
'form': form,
}
return render(request, 'groups.html', context)
groups.html:
{% block profile %}
<div class="jumbotron">
<h4>Create a new group here:</h4>
<form method="POST" class="post-form">
{% csrf_token %}
{{ form.as_p }}
<button type="submit" class="save btn btn-default">Go!</button>
</form>
</div>
{% for m in mem %}
<div class="jumbotron">
<br>
<p><b>Name of group:</b> {{ m.group }} </p>
<p><b>Member:</b> {{ m.person }} </p>
<br>
</div>
{% endfor %}
{% endblock %}
问题在于我想使用
Membership.objects.filter(person=request.user)
并收到错误:
ValueError at /groups/
Cannot query "damian": Must be "Person" instance.
其中damian是request.user
我只想过滤此内容,仅在模板中显示所选的会员资格,群组等......
任何人都知道如何解决这个问题?
答案 0 :(得分:0)
这样做,
Membership.objects.filter(person__name=request.user)
或
p = Person.objects.get(name=request.user)
Membership.objects.filter(person=p)
您必须在Person
过滤器查询中将person
类实例传递给Membership
参数。