CODEWITHSUNDEEP
pythondjangodjango-models
alireza sadeghpour
alireza sadeghpour

Reputation: 689

Order of defining models in django

I have some problem with order of defining models in django,so i want some thing like this :

class Album(models.Model):
   mainTrack = models.OneToOneField(Track)


class Track(models.Model):
   albumID = models.ForeignKey(Album)

and in this way when i want run makemigration command,django give this error:

Track is not defined

there is exist any way to solve that??

Upvotes: 2

Views: 85

Answers (2)

gamer
gamer

Reputation: 5873

You should add related_name="track" to your ForeignKey call.

class Album(models.Model):
    mainTrack = models.OneToOneField(Track)

class Track(models.Model):
    albumID = models.ForeignKey('Album', related_name="track")

Upvotes: 0

Leistungsabfall
Leistungsabfall

Reputation: 6488

As you already noticed this line

mainTrack = models.OneToOneField(Track)

references Track but obviously Track is not defined at this time.

Solution:

Reference to the Track model using a string:

mainTrack = models.OneToOneField('Track')

This is also mentioned in the docs:

If you need to create a relationship on a model that has not yet been defined, you can use the name of the model, rather than the model object itself.

Upvotes: 2

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