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29 lines
826 B
Python
29 lines
826 B
Python
from django.contrib.contenttypes.models import ContentType
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def compile_path_node(ct_id, object_id):
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return f'{ct_id}:{object_id}'
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def decompile_path_node(repr):
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ct_id, object_id = repr.split(':')
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return int(ct_id), int(object_id)
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def object_to_path_node(obj):
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"""
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Return a representation of an object suitable for inclusion in a CablePath path. Node representation is in the
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form <ContentType ID>:<Object ID>.
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"""
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ct = ContentType.objects.get_for_model(obj)
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return compile_path_node(ct.pk, obj.pk)
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def path_node_to_object(repr):
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"""
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Given the string representation of a path node, return the corresponding instance.
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"""
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ct_id, object_id = decompile_path_node(repr)
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ct = ContentType.objects.get_for_id(ct_id)
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return ct.model_class().objects.get(pk=object_id)
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