108 lines
3.9 KiB
Python
108 lines
3.9 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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import time
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import datetime
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from django.db import models
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from django.utils import datetime_safe
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from ox.utils import json
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def to_json(python_object):
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if isinstance(python_object, datetime.datetime):
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if python_object.year < 1900:
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tt = python_object.timetuple()
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value = '%d-%02d-%02dT%02d:%02d%02dZ' % tuple(list(tt)[:6])
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else:
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value = python_object.strftime('%Y-%m-%dT%H:%M:%SZ')
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return {'__class__': 'datetime.datetime',
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'__value__': value}
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if isinstance(python_object, datetime_safe.datetime):
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return {'__class__': 'datetime.datetime',
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'__value__': python_object.strftime('%Y-%m-%dT%H:%M:%SZ')}
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if isinstance(python_object, time.struct_time):
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return {'__class__': 'time.asctime',
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'__value__': time.asctime(python_object)}
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try:
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if isinstance(python_object, bytes):
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return {'__class__': 'bytes',
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'__value__': list(python_object)}
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except:
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pass
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raise TypeError(repr(python_object) + ' is not JSON serializable')
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def from_json(json_object):
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if '__class__' in json_object:
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if json_object['__class__'] == 'bytes':
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return bytes(json_object['__value__'])
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if json_object['__class__'] == 'datetime_safe.datetime' \
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or json_object['__class__'] == 'datetime.datetime':
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return datetime_safe.datetime.strptime(json_object['__value__'], '%Y-%m-%dT%H:%M:%SZ')
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if json_object['__class__'] == 'time.asctime':
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return time.strptime(json_object['__value__'])
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return json_object
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class DictField(models.TextField):
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"""DictField is a textfield that contains JSON-serialized dictionaries."""
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# Used so to_python() is called
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__metaclass__ = models.SubfieldBase
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def to_python(self, value):
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"""Convert our string value to python after we load it from the DB"""
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if value == None:
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return value
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if isinstance(value, dict):
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return value
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try:
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value = json.loads(value, object_hook=from_json)
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except: #this is required to load fixtures
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value = eval(value)
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assert isinstance(value, dict)
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return value
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def get_db_prep_save(self, value, connection):
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"""Convert our JSON object to a string before we save"""
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if value == None:
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return value
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if isinstance(value, basestring):
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value = eval(value)
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assert isinstance(value, dict)
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value = json.dumps(value, default=to_json)
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return super(DictField, self).get_db_prep_save(value, connection=connection)
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class TupleField(models.TextField):
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"""TupleField is a textfield that contains JSON-serialized tuples."""
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# Used so to_python() is called
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__metaclass__ = models.SubfieldBase
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def to_python(self, value):
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"""Convert our string value to JSON after we load it from the DB"""
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if isinstance(value, tuple):
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return value
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try:
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value = json.loads(value, object_hook=from_json)
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except: #this is required to load fixtures
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value = eval(value)
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assert isinstance(value, list)
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return tuple(value)
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def get_db_prep_save(self, value, connection):
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"""Convert our JSON object to a string before we save"""
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if isinstance(value, basestring):
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value = eval(value)
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if isinstance(value, list):
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value = tuple(value)
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assert isinstance(value, tuple)
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value = json.dumps(value, default=to_json)
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return super(TupleField, self).get_db_prep_save(value, connection=connection)
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try:
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from south.modelsinspector import add_introspection_rules
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add_introspection_rules([], ["^ox.django\.fields\.DictField"])
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add_introspection_rules([], ["^ox.django\.fields\.TupleField"])
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except:
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pass
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