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🚷 avoid assertion in patch (#5222)

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Niels Lohmann
2026-07-01 06:47:24 +02:00
committed by GitHub
parent 272411c5e6
commit 730b57775d
7 changed files with 108 additions and 20 deletions
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tests/src/unit-json_patch.cpp
+54
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@@ -1334,3 +1334,57 @@ TEST_CASE("JSON patch")
}
}
}
TEST_CASE("JSON patch - add to a primitive parent (regression #4292)")
{
// Regression test for https://github.com/nlohmann/json/issues/4292
//
// An "add" operation whose parent location resolves to a primitive
// (non-container) value must be rejected with a catchable exception.
// Previously this hit JSON_ASSERT(false) in operation_add, which aborts
// the process in debug builds and silently dropped the operation (leaving
// a wrong result) when assertions were compiled out (NDEBUG). It now
// throws out_of_range.411.
//
// The documents below are constructed programmatically (not parsed) so
// they carry no byte positions; the JSON_DIAGNOSTICS path prefix is
// handled by the guards. The exact message with positions is covered in
// unit-diagnostic-positions.cpp.
SECTION("string parent")
{
json const doc = {{"foo", {{"bar", "a string"}}}};
json const patch = {{{"op", "add"}, {"path", "/foo/bar/baz"}, {"value", 1}}};
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(doc.patch(patch), "[json.exception.out_of_range.411] (/foo/bar) cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array", json::out_of_range&);
#else
CHECK_THROWS_WITH_AS(doc.patch(patch), "[json.exception.out_of_range.411] cannot add value: the JSON Patch 'add' target's parent is of type string, but must be an object or array", json::out_of_range&);
#endif
}
SECTION("number parent")
{
json const doc = {{"foo", 1}};
json const patch = {{{"op", "add"}, {"path", "/foo/bar"}, {"value", 2}}};
#if JSON_DIAGNOSTICS
CHECK_THROWS_WITH_AS(doc.patch(patch), "[json.exception.out_of_range.411] (/foo) cannot add value: the JSON Patch 'add' target's parent is of type number, but must be an object or array", json::out_of_range&);
#else
CHECK_THROWS_WITH_AS(doc.patch(patch), "[json.exception.out_of_range.411] cannot add value: the JSON Patch 'add' target's parent is of type number, but must be an object or array", json::out_of_range&);
#endif
}
SECTION("original two-step sequence from the issue")
{
// The user's two-step patch from #4292: first turn /xyz/1 into a
// string, then try to add a member inside that string.
json const doc = R"( { "xyz": [ { "lmn": "214", "nnp": "001" } ] } )"_json;
json const patch = R"(
[
{ "op": "add", "path": "/xyz/1", "value": "" },
{ "op": "add", "path": "/xyz/1/lmn", "value": "214" }
]
)"_json;
CHECK_THROWS_AS(doc.patch(patch), json::out_of_range&);
}
}