"""

Many-to-many and many-to-one relationships to the same table

Make sure to set ``related_name`` if you use relationships to the same table.

"""

from django.db import models

class User(models.Model):

    username = models.CharField(max_length=20)

class Issue(models.Model):

    num = models.IntegerField()

    cc = models.ManyToManyField(User, blank=True, related_name="test_issue_cc")

    client = models.ForeignKey(User, models.CASCADE, related_name="test_issue_client")

    class Meta:

        ordering = ("num",)

    def __str__(self):

        return str(self.num)

class StringReferenceModel(models.Model):

    others = models.ManyToManyField("StringReferenceModel")