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from django.db import models
def mutable_from_db(value):
if value == '':
return None
try:
if isinstance(value, (str,)):
return [int(i) for i in value.split(',')]
except ValueError:
pass
return value
def mutable_to_db(value):
if value is None:
return ''
if isinstance(value, list):
value = ','.join(str(i) for i in value)
return str(value)
class MutableField(models.TextField):
def to_python(self, value):
return mutable_from_db(value)
def from_db_value(self, value, expression, connection):
return mutable_from_db(value)
def get_db_prep_save(self, value, connection):
value = super().get_db_prep_save(value, connection)
return mutable_to_db(value)
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