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import django
from django.db import models
class Company(models.Model):
name = models.CharField(max_length=100)
main_project = models.ForeignKey(
"Project", null=True, blank=True, on_delete=models.CASCADE
)
class Meta:
ordering = ("name",)
class Project(models.Model):
company = models.ForeignKey(
Company,
null=True,
blank=True,
on_delete=models.CASCADE,
related_name="projects",
)
topic = models.CharField(max_length=30)
artist = models.CharField(max_length=30, blank=True)
supervisor = models.CharField(max_length=30, blank=True)
research_notes = models.TextField(blank=True)
class Meta:
constraints = (
models.CheckConstraint(
**(
{ # type: ignore[arg-type]
"condition": (models.Q(artist="") | models.Q(supervisor=""))
& (~models.Q(topic="") | ~models.Q(topic=""))
}
if django.VERSION >= (5, 1)
else {
"check": (models.Q(artist="") | models.Q(supervisor=""))
& (~models.Q(topic="") | ~models.Q(topic=""))
}
),
name="artist_xor_supervisor",
),
)
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