48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
from django.db import models
|
|
from django.utils import simplejson as json
|
|
|
|
|
|
class DictField(models.TextField):
|
|
"""DictField is a textfield that contains JSON-serialized dictionaries."""
|
|
|
|
# Used so to_python() is called
|
|
__metaclass__ = models.SubfieldBase
|
|
|
|
def to_python(self, value):
|
|
"""Convert our string value to python after we load it from the DB"""
|
|
if isinstance(value, dict):
|
|
return value
|
|
|
|
value = json.loads(value)
|
|
assert isinstance(value, dict)
|
|
return value
|
|
|
|
def get_db_prep_save(self, value):
|
|
"""Convert our JSON object to a string before we save"""
|
|
assert isinstance(value, dict)
|
|
value = json.dumps(value)
|
|
return super(DictField, self).get_db_prep_save(value)
|
|
|
|
|
|
class TupleField(models.TextField):
|
|
"""TupleField is a textfield that contains JSON-serialized tuples."""
|
|
|
|
# Used so to_python() is called
|
|
__metaclass__ = models.SubfieldBase
|
|
|
|
def to_python(self, value):
|
|
"""Convert our string value to JSON after we load it from the DB"""
|
|
if isinstance(value, tuple):
|
|
return value
|
|
|
|
value = json.loads(value)
|
|
assert isinstance(value, list)
|
|
return tuple(value)
|
|
|
|
def get_db_prep_save(self, value):
|
|
"""Convert our JSON object to a string before we save"""
|
|
assert isinstance(value, tuple)
|
|
value = json.dumps(value)
|
|
return super(TupleField, self).get_db_prep_save(value)
|
|
|