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Edit File: 143_malware_hit_cascade_delete.py

import peewee

class MalwareScan(peewee.Model):
    class Meta:
        db_table = "malware_scans"

scanid = peewee.CharField(primary_key=True)

class MalwareHit(peewee.Model):
    class Meta:
        db_table = "malware_hits"

id = peewee.PrimaryKeyField()
    scanid = peewee.ForeignKeyField(
        MalwareScan, null=False, related_name="hits", on_delete="CASCADE"
    )
    user = peewee.CharField(null=False)
    orig_file = peewee.BlobField(null=False)
    type = peewee.CharField(null=False)
    malicious = peewee.BooleanField(null=False, default=False)
    vendor = peewee.CharField(null=False, default="ai-bolit")
    hash = peewee.CharField(null=True)
    size = peewee.CharField(null=True)
    timestamp = peewee.FloatField(null=True)
    status = peewee.CharField(default="found")
    cleaned_at = peewee.FloatField(null=True)

@classmethod
    def get_field_names(cls):
        return map(lambda field: field.column_name, cls._meta.sorted_fields)

def migrate(migrator, database, fake=False, **kwargs):
    migrator.sql("ALTER TABLE malware_hits RENAME TO malware_hits_old;")
    migrator.create_model(MalwareHit)
    # specify fields order directly, because '*' doesnt guarantee order
    malware_hit_fields = ",".join(MalwareHit.get_field_names())
    migrator.sql(
        "INSERT INTO malware_hits ({0}) SELECT {0} FROM malware_hits_old;"
        .format(malware_hit_fields)
    )
    migrator.sql("DROP TABLE malware_hits_old;")

def rollback(migrator, database, fake=False, **kwargs):
    pass

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