当您在应用程序中创建项目时,我正在处理它可以选择哪些用户应该成为项目的成员。但是,我不希望项目的创建者(作为管理员)位于您可以选择成为成员的用户列表中。
您是管理员或成员,而不是两者。当然可以不添加一个自我作为成员,但我甚至不希望它成为可能。
怎么可以这样做?
查看:
def project_add(request):
if request.method == "POST":
form = ProjectForm(request.POST)
if form.is_valid():
form.instance.date_added = datetime.date.today()
form.instance.date_updated = datetime.date.today()
form.instance.added_by_user = request.user
form.save()
return redirect(project_list)
else:
form = ProjectForm()
return render(request, 'projects/add.html', {"form" : form})
项目模型:
class Project(models.Model):
...rest of the fields...
added_by_user = models.ForeignKey(User)
users = models.ManyToManyField(User, related_name='projects')
def __unicode__(self):
return self.name
def owned_by_user(self, user):
return self.added_by_user == user
表单:
class ProjectForm(ModelForm):
class Meta:
model = Project
exclude = ('date_added', 'date_updated', 'added_by_user')
...
为了更清楚,我在下面提供了一张图片。我不希望“Nisse”可以在下面的“Users:”下面选择(这是项目的成员),因为Nisse是创建项目的用户。
答案 0 :(得分:2)
试试这个:
class ProjectForm(ModelForm):
...
users = forms.ModelMultipleChoiceField(queryset=User.objects.all())
# change the queryset for the modelform `users` field to exclude `instance.added_by_user`
def __init__(self, *args, **kwargs):
super(ProjectForm, self).__init__(self, *args, **kwargs)
if self.instance:
self.fields['users'].queryset = self.fields['users'].queryset.exclude(self.instance.added_by_user)
# custom clean method to not allow the `added_by_user`
def clean(self):
cleaned_data = super(ProjectForm, self).clean()
if self.instance.added_by_user in cleaned_data.get('users'):
raise ValidationError("OH NOES")
return cleaned_data
你可能需要按摩一下。它未经测试但你明白了
https://docs.djangoproject.com/en/dev/topics/forms/modelforms/#overriding-the-clean-method