48 lines
1.4 KiB
Python
48 lines
1.4 KiB
Python
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from django.db import models
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from django.utils import simplejson as json
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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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value = json.loads(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)
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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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value = json.loads(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)
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return super(TupleField, self).get_db_prep_save(value)
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