Can I Make a foreignKey to same model in django?

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 ?

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最佳答案

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

小开

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

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