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Defect (rules-system-bound#17, reproduced at live head 48bb2aa)
Container.add_child in src/rules_system_bound/container.py (blob 5718d443, unchanged from the issue's base) unconditionally assigned child.parent = self and appended, so:
Self-parenting succeeded (a.add_child(a); parent is self).
An ancestor cycle succeeded (root -> mid -> leaf, then leaf.add_child(root)); get_lineage() then never terminates (capped walk: 10 steps, still walking).
Reparenting leaked: p1.add_child(ch) then p2.add_child(ch) left ch in both parents' children lists while ch.parent pointed only at p2.
Re-adding the same child duplicated it in children.
Identity corruption: a distinct dataclass-equal twin with the same parent was in the children list, so remove_child(twin) removed the real child and cleared the twin's parent, leaving the real child claiming a parent that no longer contained it.
Fix (only the issue's allowed write set)
src/rules_system_bound/container.py:
add_child rejects self-parenting and ancestor cycles with a deterministic ValueError before any mutation (walks this container's parent chain; both trees unchanged on rejection).
Re-adding the same object is a no-op, never a duplicate.
Moving a child to another parent atomically reparents it: detached from the previous parent's children list by identity, then attached here — the explicit behaviour, documented in the method docstring. No depth limit, no containment-rule weakening.
remove_child and envelops use object identity (is), not dataclass equality, so a distinct equal-valued object can neither detach the real child nor count as enveloped.
tests/test_container_relationships.py (new, 8 focused regressions): self-parenting rejection + unchanged state, ancestor-cycle rejection + unchanged lineage, no-duplicate re-add, atomic reparent, descendant promotion to direct child without a cycle, identity-based removal, identity-based envelops, and normal lineage/descendant order with an unrelated child unchanged.
Receipts (verified before opening)
Pre-fix probes at head 48bb2aa reproduced all five behaviours above; post-fix probes show ValueError for self/ancestor, lineage terminating in 3 steps, reparent with p1_children=[], duplicate count 1, and the twin-removal case leaving the real child intact.
Full local suite: pytest tests -q — 26 passed (18 existing in test_core.py + 8 new), unchanged existing expectations.
No other files touched; branch is from main at 48bb2aa only.
Not authorized by this PR
Merge, release, publication, deployment, protected-branch writes, and repository-setting changes are not authorized by this PR — merge is Anthony's call. This PR does not touch his branches; it is a new branch from main at 48bb2aa.
Summary by Sourcery
Enforce consistent, acyclic container relationships while preserving correct lineage and descendant behavior.
Bug Fixes:
Enforce acyclic, single-parent container relationships by rejecting self and ancestor cycles, preventing duplicate children, and atomically reparenting moved children.
Use object identity for child removal and containment checks to prevent equal-valued containers from corrupting relationships.
Tests:
Add regression coverage for cycle prevention, reparenting, duplicate handling, identity semantics, direct-list inconsistencies, and normal lineage behavior.
Summary by CodeRabbit
Bug Fixes
Container relationships now distinguish objects by identity, so equal-valued items are not mistaken for one another.
Adding a child already in a container no longer creates a duplicate. Moving a child updates its previous parent, and adding a descendant directly updates its parent relationship.
Self-parenting and ancestor cycles are rejected without changing relationships.
Removing a non-child leaves relationships unchanged; removing a child clears its parent link when appropriate.
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Reviewing files that changed from the base of the PR and between b051a98 and b7f8ab3.
Files selected for processing: 2
src/rules_system_bound/container.py
tests/test_container_relationships.py
Walkthrough
Container child operations now use object identity for membership and removal. Adding a child rejects cycles, avoids duplicate links, and reparents children. Regression tests cover relationship state and lineage.
Directly constructed relationships can still form a cycle and break descendant traversal. This edge case needs follow-up before relying on the acyclic guarantee.
Pre-merge checks: 5
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Title check
The title "fix(container): enforce acyclic, single-parent relationships" matches the main change. The PR makes add_child reject self-parenting and ancestor cycles before mutation, prevents duplicate c…
Docstring Coverage
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentat…
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Full details: Title check
Explanation
The title "fix(container): enforce acyclic, single-parent relationships" matches the main change. The PR makes add_child reject self-parenting and ancestor cycles before mutation, prevents duplicate children, and reparents a child by identity so it has a single parent. The title is specific and uses a conventional commit prefix. The title does not mention the identity-based change to remove_child and envelops, but it does not need to cover every detail.
Full details: Docstring Coverage
Explanation
Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff with cyclomatic complexity of at least 2. Documentation-only edits and deletions within surviving functions are included; unchanged diff context and fully deleted functions are excluded. Analyzed 3 functions across 2 files.
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The PR hardens Container relationships by preventing self and ancestor cycles before mutation, maintaining exactly one parent through identity-based atomic reparenting, avoiding duplicate children, and eliminating dataclass-equality membership corruption. Eight focused tests cover the new invariants and confirm existing lineage and descendant traversal behavior remains intact.
Sequence diagram for identity-based atomic reparenting
sequenceDiagram
participant P1 as PreviousParent
participant Child
participant P2 as NewParent
P1->>P1: add_child(Child)
P1->>Child: set parent = P1
P2->>P2: add_child(Child)
P2->>P1: remove child by identity
P2->>Child: set parent = P2
P2->>P2: append child once
Loading
Flow diagram for cycle-safe child addition
flowchart TD
A["add_child(child)"] --> B{child is self}
B -- yes --> E[Raise ValueError]
B -- no --> C[Walk this parent chain]
C --> D{child is an ancestor}
D -- yes --> E
D -- no --> F{Existing child is child by identity}
F -- yes --> G[No-op]
F -- no --> H[Detach from previous parent by identity]
H --> I[Set parent and append once]
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File-Level Changes
Change
Details
Files
Enforce acyclic, single-parent containment relationships with deterministic validation and atomic reparenting.
Reject self-parenting and adding an ancestor before mutating either tree.
Treat re-adding the identical child as a no-op and move children from an existing parent by identity.
Document the reparenting and cycle-rejection behavior.
src/rules_system_bound/container.py
Make containment membership and removal identity-based to prevent equal-valued objects from corrupting relationships.
Use identity checks in envelops and remove_child.
Only clear a child's parent when the exact child instance is removed.
src/rules_system_bound/container.py
Add focused regression coverage for relationship invariants and preserved traversal behavior.
Test cycle rejection with unchanged state, duplicate prevention, atomic reparenting, and descendant promotion.
Test identity-safe removal and membership, plus normal lineage and descendant ordering.
tests/test_container_relationships.py
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @src/rules_system_bound/container.py:
- Around line 71-84: Update the child-parent reconciliation in the visible
Container method so an existing child entry does not return before its parent
link is corrected. Reconcile and detach any old parent first, then append the
child only if it is not already present by identity.
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Actionable comments posted: 1
🪄 Fix comments: Fix CodeRabbit comments on this PR
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only still-valid issues, skip the rest with a brief reason, keep changes
minimal, and validate.
Inline comments:
Review comments at @src/rules_system_bound/container.py:
- Around line 79-87: Update add_child to check the candidate child’s descendants
by object identity before changing any parent links or children lists, and
reject the addition if self is reachable in that graph. Preserve the existing
parent-chain check and ensure traversal handles already-cyclic child graphs
without looping.
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Defect (rules-system-bound#17, reproduced at live head 48bb2aa)
Container.add_childinsrc/rules_system_bound/container.py(blob 5718d443, unchanged from the issue's base) unconditionally assignedchild.parent = selfand appended, so:a.add_child(a);parent is self).root -> mid -> leaf, thenleaf.add_child(root));get_lineage()then never terminates (capped walk: 10 steps, still walking).p1.add_child(ch)thenp2.add_child(ch)leftchin both parents' children lists whilech.parentpointed only atp2.children.inthe children list, soremove_child(twin)removed the real child and cleared the twin's parent, leaving the real child claiming a parent that no longer contained it.Fix (only the issue's allowed write set)
src/rules_system_bound/container.py:add_childrejects self-parenting and ancestor cycles with a deterministicValueErrorbefore any mutation (walks this container's parent chain; both trees unchanged on rejection).remove_childandenvelopsuse object identity (is), not dataclass equality, so a distinct equal-valued object can neither detach the real child nor count as enveloped.tests/test_container_relationships.py(new, 8 focused regressions): self-parenting rejection + unchanged state, ancestor-cycle rejection + unchanged lineage, no-duplicate re-add, atomic reparent, descendant promotion to direct child without a cycle, identity-based removal, identity-basedenvelops, and normal lineage/descendant order with an unrelated child unchanged.Receipts (verified before opening)
ValueErrorfor self/ancestor, lineage terminating in 3 steps, reparent withp1_children=[], duplicate count 1, and the twin-removal case leaving the real child intact.pytest tests -q— 26 passed (18 existing intest_core.py+ 8 new), unchanged existing expectations.python -m rules_system_bound --jsonemits the activation report (containment score 1.0, lineage["bounded-system", "framework"]).Not authorized by this PR
Merge, release, publication, deployment, protected-branch writes, and repository-setting changes are not authorized by this PR — merge is Anthony's call. This PR does not touch his branches; it is a new branch from main at 48bb2aa.
Summary by Sourcery
Enforce consistent, acyclic container relationships while preserving correct lineage and descendant behavior.
Bug Fixes:
Tests:
Summary by CodeRabbit