如何過濾用戶作為外鍵 django forms 中的選擇？

Question

我遇到了從 django forms 中的外鍵字段過濾項目經理的問題。 我想排除超級用戶和項目經理以外的其他用戶角色。

模型.py

class Projects(models.Model):

id=models.AutoField(primary_key=True)
project_name=models.CharField(max_length=255)
project_manager=models.ForeignKey(CustomUser,on_delete=models.CASCADE, limit_choices_to={'is_project_manager__eq : 1 '})
client_name=models.ForeignKey(Clients,on_delete=models.CASCADE, null=True)
project_pic=models.ImageField(upload_to='static/website/project-images')
project_start_date=models.DateField(null=True)
project_end_date=models.DateField(null=True)
project_description=models.TextField(null=True)
created_at=models.DateTimeField(auto_now_add=True)
updated_at=models.DateTimeField(auto_now=True)
is_draft = models.BooleanField(default=True)
objects=models.Manager()

class Meta:
    verbose_name_plural = 'Project'

def __str__(self):
    return f'{self.project_name}'

Forms.py

class ProjectForm(forms.ModelForm): 
class Meta: 
    model = Projects
    fields = ['project_name', 'project_manager', 'client_name', 'project_pic', 'project_start_date', 'project_end_date', 'project_description']

視圖.py

def project_list(request):

projects = Projects.objects.all()

if request.method == 'POST':
    form = ProjectForm(request.POST, request.FILES)
    if form.is_valid():
        form.save()
        project_name = form.cleaned_data.get('project_name')
        messages.success(request, f'{project_name} has been successfully added.')
        return redirect('project_list')
else:
    form = ProjectForm()

context = {

    'projects' : projects,
    'form' : form,

}

template_name ='project-admin/project-list.html'
return render(request, template_name, context)

自定義用戶/模型.py

這是他們自己的角色，可將他們設置為項目經理、庫存管理員和客戶

class CustomUser(AbstractUser):

is_inventory_admin = models.BooleanField('Is Inventory Admin', default=False)
is_project_manager = models.BooleanField('Is Project Manager', default=False)
is_client = models.BooleanField('Is Client', default=False)

class Meta:
    db_table = 'auth_user' 

Answer 1

您檢查條件：

class Projects(models.Model):
    # …
    project_manager = models.ForeignKey(
        CustomUser,
        on_delete=models.CASCADE,
        limit_choices_to={'is_project_manager': True}
    )
    # …

您還可以明確排除is_inventory_admin=True和is_client=True （如果CustomUser可以同時是兩個或三個），具有：

class Projects(models.Model):
    # …
    project_manager = models.ForeignKey(
        CustomUser,
        on_delete=models.CASCADE,
        limit_choices_to={'is_project_manager': True, 'is_inventory_admin': False, 'is_client': False}
    )
    # …

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注意：通常使用settings.AUTH_USER_MODEL [Django-doc]引用用戶 model 比直接使用User model [Django-doc] 更好。 有關更多信息，您可以查看參考文檔的User model部分。

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注意：通常 Django model 被賦予一個單數名稱，因此Project而不是Projects 。