Question

我目前正在建立一个帮助台票务系统作为学校项目。我正在使用内置的django auth系统，我想从auth系统引用用户ID。例如，票证将分配给某个帮助台员工。我模特的一部分：

class Ticket(models.Model):
    category = models.ManyToManyField(Category)
    title = models.CharField(max_length=30)
    submitted = models.DateTimeField(editable=False)
    submitter = #reference to user
    assignedTo = #reference to helpdesk employee

用户位于群组user中，帮助台员工位于django auth系统的群组helpdeskemployee中。

我已找到this和this

所以我尝试了这个：

class Ticket(models.Model):
    category = models.ManyToManyField(Category)
    title = models.CharField(max_length=30)
    submitted = models.DateTimeField(editable=False)
    submitter = models.OneToOneField(User)
    assignedTo = user = models.OneToOneField(User)

但是在运行python manage.py syncdb时会出现以下错误：

CommandError: One or more models did not validate:
deskman.ticket: Accessor for field 'submitter' clashes with related field 'User.ticket'. Add a related_name argument to the definition for 'submitter'.
deskman.ticket: Reverse query name for field 'submitter' clashes with related field 'User.ticket'. Add a related_name argument to the definition for 'submitter'.
deskman.ticket: Accessor for field 'assignedTo' clashes with related field 'User.ticket'. Add a related_name argument to the definition for 'assignedTo'.
deskman.ticket: Reverse query name for field 'assignedTo' clashes with related field 'User.ticket'. Add a related_name argument to the definition for 'assignedTo'.
deskman.ticket: Accessor for field 'assignedTo' clashes with related field 'User.ticket'. Add a related_name argument to the definition for 'assignedTo'.
deskman.ticket: Reverse query name for field 'assignedTo' clashes with related field 'User.ticket'. Add a related_name argument to the definition for 'assignedTo'.

Answer 1

首先，您可能不想使用OneToOneField。这意味着用户只能拥有一张单票。 ForeignKey关系会更好。

class Ticket(models.Model):
    category = models.ManyToManyField(Category)
    title = models.CharField(max_length=30)
    submitted = models.DateTimeField(editable=False)
    submitter = models.ForeignKey(User)
    assignedTo = models.ForeignKey(User)

您收到错误的原因是您与Ticket的同一模型有两种关系。这意味着如果你有一个User对象并且你试图反转它，那么你想要使用哪种关系并不清楚：

 user.ticket_set.all() 
 # Do you want `submitter` tickets, or `assignedTo` tickets? It's not clear

要解决此问题，请为每个字段添加related_name属性

class Ticket(models.Model):
    category = models.ManyToManyField(Category)
    title = models.CharField(max_length=30)
    submitted = models.DateTimeField(editable=False)
    submitter = models.ForeignKey(User, related_name="tickets_submitter")
    assignedTo = models.ForeignKey(User, related_name="tickets_assignedto")

现在你可以分别得到两种反向关系：

 user.tickets_submitter.all()
 user.tickets_assignedto.all()

Django模型：用户ID

1 个答案: