diff options
| -rw-r--r-- | gn3/db/rdf/wiki.py | 12 |
1 files changed, 8 insertions, 4 deletions
diff --git a/gn3/db/rdf/wiki.py b/gn3/db/rdf/wiki.py index f945f06..f7bec47 100644 --- a/gn3/db/rdf/wiki.py +++ b/gn3/db/rdf/wiki.py @@ -156,9 +156,13 @@ CONSTRUCT { else: result["pubmed_ids"] = [] result["version"] = int(result["version"]) - # We manually sort the array, since somehow "ORDER BY" in the - # sparql query is jumbled up during framing and compacting. This - # operation isn't heavy since we don't get many versions per wiki - # entry. + + # We manually sort the array, since the SPARQL engine does not + # provide a guarantee that it will support an ORDER BY clause in a + # CONSTRUCT. Using ORDER BY on a solution sequence for a CONSTRUCT + # or DESCRIBE query has no direct effect because only SELECT + # returns a sequence of results. See: + # <https://stackoverflow.com/questions/78186393> + # <https://www.w3.org/TR/rdf-sparql-query/#modOrderBy> results["data"] = sorted(data, key=lambda d: d["version"], reverse=True) return results |