77 lines
2.7 KiB
Python
77 lines
2.7 KiB
Python
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import time
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from django.db import models
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from django.utils import simplejson as json
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def to_json(python_object):
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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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if isinstance(python_object, bytes):
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return {'__class__': 'bytes',
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'__value__': list(python_object)}
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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__'] == 'time.asctime':
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return time.strptime(json_object['__value__'])
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if json_object['__class__'] == 'bytes':
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return bytes(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 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):
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"""Convert our JSON object to a string before we save"""
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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)
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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):
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"""Convert our JSON object to a string before we save"""
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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)
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try:
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from south.modelsinspector import add_introspection_rules
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add_introspection_rules([], ["^oxdjango\.fields\.DictField"])
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add_introspection_rules([], ["^oxdjango\.fields\.TupleField"])
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except:
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pass
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