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django-update-manager / update_manager / models / software_package.py

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from django.db import models

class SoftwarePackage(models.Model):
    name = models.CharField(max_length=100, unique=True)
    default_release_version = models.ForeignKey('ReleaseVersion', 
        null=True, blank=True
    )
    
    class Meta:
        app_label = 'update_manager'