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Type:
Bug
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Resolution: Works as Designed
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Priority:
Major - P3
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Affects Version/s: 1.6.2
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Component/s: libbson
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Environment:Windows 10 64bits
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Working on the following collection:
{"_id":{"$oid":"58e17a4dd7b07d1fee077fac"},"item":"journal","instock":[{"warehouse":"A","qty":5.0},{"warehouse":"C","qty":15.0}]}
{"_id":{"$oid":"58e17a4dd7b07d1fee077fad"},"item":"notebook","instock":[{"warehouse":"C","qty":5.0}]}
{"_id":{"$oid":"58e17a4dd7b07d1fee077fae"},"item":"paper","instock":[{"warehouse":"A","qty":60.0},{"warehouse":"B","qty":15.0}]}
{"_id":{"$oid":"58e17a4dd7b07d1fee077faf"},"item":"planner","instock":[{"warehouse":"A","qty":40.0},{"warehouse":"B","qty":5.0}]}
{"_id":{"$oid":"58e17a4dd7b07d1fee077fb0"},"item":"postcard","instock":[{"warehouse":"B","qty":15.0},{"warehouse":"C","qty":35.0}]}
When finding the "instock" item by:
bson_iter_find_descendant(&Iter, "instock", &Desc))
it is correctly of type ARRAY and can be printed with:
if (BSON_ITER_HOLDS_ARRAY(&Iter)) { char *str = NULL; bson_t *arr; const uint8_t *data = NULL; uint32_t len = 0; bson_iter_array(&Desc, &len, &data); arr = bson_new_from_data(data, len); str = bson_as_json(arr, NULL); bson_free(str); bson_destroy(arr);
str is:
{"0":{"warehouse":"A","qty":5.0},"1":{"warehouse":"C","qty":15.0}}
{"0":{"warehouse":"C","qty":5.0}}
{"0":{"warehouse":"A","qty":60.0},"1":{"warehouse":"B","qty":15.0}}
{"0":{"warehouse":"A","qty":40.0},"1":{"warehouse":"B","qty":5.0}}
{"0":{"warehouse":"B","qty":15.0},"1":{"warehouse":"C","qty":35.0}}
It is also possible to retrieve the values of wareahouse or qty by something like:
bson_iter_find_descendant(&Iter, "instock.0.warehouse", &Desc)) or bson_iter_find_descendant(&Iter, "instock.1.qty", &Desc))
However when using:
bson_iter_find_descendant(&Iter, "instock.0", &Desc))
One would expect to retrieve an item of type DOCUMENT. But instead it is retrieved as type ARRAY and when trying to execute:
bson_iter_document(&Desc, &len, &data); arr = bson_new_from_data(data, len);
data is null and the program crashes.