Django 防止项目的创建者成为项目的成员

在我正在开发的应用程序中创建项目时，可以选择哪些用户应成为项目的成员。但是，我不希望项目的创建者（管理员）出现在您可以选择成为成员的用户列表中

你要么是管理员，要么是会员，而不是两者都是。当然，不添加一个self作为成员是可能的，但我甚至不希望它成为可能

这怎么可能呢

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})

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

class ProjectForm(ModelForm):
class Meta:
    model = Project
    exclude = ('date_added', 'date_updated', 'added_by_user')

项目模型：

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})

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

class ProjectForm(ModelForm):
class Meta:
    model = Project
    exclude = ('date_added', 'date_updated', 'added_by_user')

表格：

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})

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

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:”下选择（这是项目的成员），因为Nisse是创建项目的用户

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

你可能需要稍微按摩一下。它未经测试，但你明白了

---

您如何添加

项目的可能重复。用户

？只需使用如下内容防止用户添加的

添加到
用户中：
如果项目.owned\u由用户（request.user）拥有：返回“您不能将自己作为用户添加到您拥有的项目”；else:users=request.user
@Hedde:No，这绝对不是重复的，因为它与此问题无关。@danhoert:该解决方案仍然可以在模板的用户列表中选择用户，对吗？是否可以在没有项目创建者的情况下从一开始渲染选择框？渲染哪个选择框？您在这里没有提供太多信息。谢谢您的回答。我需要进口什么东西吗？我得到了“异常类型：DoesNotExist”…您可能需要
django.contrib.auth.models.User
和
django.core.exceptions.ValidationError
和
django.forms
在没有更多堆栈跟踪的情况下无法确定错误是什么。