-
-
Save EricTatua/8ddf68a5895504891b84b86b53a9e811 to your computer and use it in GitHub Desktop.
Example of using a through model in Django and filtering by a value on the custom through model.
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
| class A(models.Model): | |
| things = models.ManyToManyField("B", through=ThroughModel) | |
| class B(models.Model): | |
| text = models.TextField() | |
| class ThroughModel(models.Model): | |
| a = models.ForeignKey(A) | |
| b = models.ForeignKey(B) | |
| extra = models.BooleanField() | |
| #this will return a list of ThroughModel objects | |
| ThroughModel.objects.filter(b=instance_of_b, extra=True) | |
| #this will return a list of A objects based on an extra field on the through table | |
| A.objects.filter(things__ThroughModel__extra=True) | |
| #keep in mind that limiting by one of the foreign keys on the through model is easier | |
| A.objects.filter(things=instance_of_b) |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment