author | Lennard de Rijk <ljvderijk@gmail.com> |
Mon, 16 Mar 2009 15:33:27 +0000 | |
changeset 1889 | 4356a9201d20 |
parent 323 | ff1a9aa48cfd |
permissions | -rw-r--r-- |
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""" |
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Interfaces for serializing Django objects. |
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|
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Usage:: |
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|
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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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|
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To add your own serializers, use the SERIALIZATION_MODULES setting:: |
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|
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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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|
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from django.conf import settings |
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|
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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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"python" : "django.core.serializers.python", |
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"json" : "django.core.serializers.json", |
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} |
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# Check for PyYaml and register the serializer if it's available. |
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try: |
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import yaml |
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BUILTIN_SERIALIZERS["yaml"] = "django.core.serializers.pyyaml" |
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except ImportError: |
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pass |
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_serializers = {} |
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def register_serializer(format, serializer_module, serializers=None): |
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""""Register a new serializer. |
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``serializer_module`` should be the fully qualified module name |
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for the serializer. |
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|
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If ``serializers`` is provided, the registration will be added |
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to the provided dictionary. |
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If ``serializers`` is not provided, the registration will be made |
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directly into the global register of serializers. Adding serializers |
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directly is not a thread-safe operation. |
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""" |
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module = __import__(serializer_module, {}, {}, ['']) |
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if serializers is None: |
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_serializers[format] = module |
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else: |
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serializers[format] = module |
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def unregister_serializer(format): |
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"Unregister a given serializer. This is not a thread-safe operation." |
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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_serializer_formats(): |
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if not _serializers: |
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_load_serializers() |
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return _serializers.keys() |
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def get_public_serializer_formats(): |
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if not _serializers: |
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_load_serializers() |
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return [k for k, v in _serializers.iteritems() if not v.Serializer.internal_use_only] |
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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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|
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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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|
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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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global _serializers |
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serializers = {} |
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for format in BUILTIN_SERIALIZERS: |
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register_serializer(format, BUILTIN_SERIALIZERS[format], serializers) |
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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], serializers) |
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_serializers = serializers |