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import mimetypes
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def serialize(instance, file_attr='file'):
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obj = getattr(instance, file_attr)
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return {
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'id': instance.id,
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'url': obj.url,
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'name': obj.name,
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'type': mimetypes.guess_type(obj.path)[0] or 'image/png',
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'size': obj.size,
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'deleteUrl': '/delete',
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'deleteType': 'DELETE',
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}
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