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docs(#1484): document pair-keyed part-to-master invariant in _propagate_restrictions #1494

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docs(#1484): document pair-keyed part-to-master invariant in _propagate_restrictions #1494

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6 changes: 6 additions & 0 deletions src/datajoint/diagram.py
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Expand Up @@ -696,6 +696,12 @@ def _propagate_restrictions(self, start_node, mode, part_integrity="enforce"):
Walks the dependency graph in topological order, applying
propagation rules at each edge. Only processes descendants of
start_node to avoid duplicate propagation when chaining.

Invariant (``part_integrity="cascade"``): each restricted Part fires
its own upward walk to its Master exactly once — deduplicated per
``(part, master)`` pair (``visited_part_master_pairs``), not per
master — so a Master reached through several restricted Parts is
restricted from every one of them.
"""

sorted_nodes = topo_sort(self)
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