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from django.db import migrations
def create_default_system(apps, schema_editor):
GradingSystem = apps.get_model('grades', 'GradingSystem')
GradeRange = apps.get_model('grades', 'GradeRange')
db = schema_editor.connection.alias
default_system = GradingSystem.objects.using(db).create(name='default')
graderanges_objects = [
GradeRange(system=default_system, lower_limit=0, upper_limit=40,
grade='F', description='Fail'),
GradeRange(system=default_system, lower_limit=40, upper_limit=55,
grade='P', description='Pass'),
GradeRange(system=default_system, lower_limit=55, upper_limit=60,
grade='C', description='Average'),
GradeRange(system=default_system, lower_limit=60, upper_limit=75,
grade='B', description='Satisfactory'),
GradeRange(system=default_system, lower_limit=75, upper_limit=90,
grade='A', description='Good'),
GradeRange(system=default_system, lower_limit=90, upper_limit=101,
grade='A+', description='Excellent')
]
GradeRange.objects.using(db).bulk_create(graderanges_objects)
def delete_default_system(apps, schema_editor):
GradingSystem = apps.get_model('grades', 'GradingSystem')
GradeRange = apps.get_model('grades', 'GradeRange')
db = schema_editor.connection.alias
default_system = GradingSystem.objects.using(db).get(creator=None)
GradeRange.object.using(db).filter(system=default_system).delete()
default_system.delete()
class Migration(migrations.Migration):
dependencies = [('grades', '0001_initial'), ]
operations = [migrations.RunPython(create_default_system,
delete_default_system), ]
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