Can I Make a foreignKey to same model in django?

问题:

Assume I have this model :

class Task(models.Model):     title = models.CharField() 

Now I would like that a task may be relates to another task. So I wanted to do this :

class Task(models.Model):     title = models.CharField()     relates_to = ForeignKey(Task) 

however I have an error which states that Task is note defined. Is this "legal" , if not, how should I do something similar to that ?

回答1:

class Task(models.Model):     title = models.CharField()     relates_to = models.ForeignKey('self') 

https://docs.djangoproject.com/en/dev/ref/models/fields/#foreignkey

回答2:

Yea you can do that, make the ForeignKey attribute a string:

class Task(models.Model):     title = models.CharField()     relates_to = ForeignKey('Task') 

In depth, you can also cross reference an app's model by using the dot notation, e.g.

class Task(models.Model):     title = models.CharField()     relates_to = ForeignKey('<app_name>.Task')  # e.g. 'auth.User' 

文章来源: Can I Make a foreignKey to same model in django?