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37 lines
1.3 KiB
Python
37 lines
1.3 KiB
Python
from django.db.models import QuerySet
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class PrefixQuerySet(QuerySet):
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def annotate_depth(self, limit=None):
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"""
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Iterate through a QuerySet of Prefixes and annotate the hierarchical level of each. While it would be preferable
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to do this using .annotate() on the QuerySet to count the unique parents of each prefix, that approach introduces
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performance issues at scale.
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Because we're adding a non-field attribute to the model, annotation must be made *after* any QuerySet
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modifications.
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"""
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queryset = self
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stack = []
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for p in queryset:
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try:
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prev_p = stack[-1]
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except IndexError:
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prev_p = None
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if prev_p is not None:
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while (p.prefix not in prev_p.prefix) or p.prefix == prev_p.prefix:
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stack.pop()
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try:
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prev_p = stack[-1]
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except IndexError:
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prev_p = None
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break
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if prev_p is not None:
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prev_p.has_children = True
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stack.append(p)
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p.depth = len(stack) - 1
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if limit is None:
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return queryset
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return list(filter(lambda p: p.depth <= limit, queryset))
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