76 lines
2.3 KiB
Python
76 lines
2.3 KiB
Python
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"""
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Interfaces for serializing Django objects.
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Usage::
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>>> from django.core import serializers
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>>> json = serializers.serialize("json", some_query_set)
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>>> objects = list(serializers.deserialize("json", json))
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To add your own serializers, use the SERIALIZATION_MODULES setting::
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SERIALIZATION_MODULES = {
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"csv" : "path.to.csv.serializer",
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"txt" : "path.to.txt.serializer",
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}
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"""
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from django.conf import settings
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# Built-in serializers
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BUILTIN_SERIALIZERS = {
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"xml" : "django.core.serializers.xml_serializer",
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}
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_serializers = {}
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def register_serializer(format, serializer_module):
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"""Register a new serializer by passing in a module name."""
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module = __import__(serializer_module, '', '', [''])
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_serializers[format] = module
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def unregister_serializer(format):
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"""Unregister a given serializer"""
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del _serializers[format]
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def get_serializer(format):
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if not _serializers:
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_load_serializers()
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return _serializers[format].Serializer
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def get_deserializer(format):
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if not _serializers:
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_load_serializers()
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return _serializers[format].Deserializer
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def serialize(format, queryset, **options):
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"""
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Serialize a queryset (or any iterator that returns database objects) using
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a certain serializer.
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"""
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s = get_serializer(format)()
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s.serialize(queryset, **options)
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return s.getvalue()
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def deserialize(format, stream_or_string):
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"""
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Deserialize a stream or a string. Returns an iterator that yields ``(obj,
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m2m_relation_dict)``, where ``obj`` is a instantiated -- but *unsaved* --
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object, and ``m2m_relation_dict`` is a dictionary of ``{m2m_field_name :
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list_of_related_objects}``.
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"""
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d = get_deserializer(format)
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return d(stream_or_string)
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def _load_serializers():
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"""
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Register built-in and settings-defined serializers. This is done lazily so
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that user code has a chance to (e.g.) set up custom settings without
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needing to be careful of import order.
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"""
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for format in BUILTIN_SERIALIZERS:
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register_serializer(format, BUILTIN_SERIALIZERS[format])
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if hasattr(settings, "SERIALIZATION_MODULES"):
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for format in settings.SERIALIZATION_MODULES:
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register_serializer(format, settings.SERIALIZATION_MODULES[format])
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