fix badmatch when fetching latest rev

Closes #3362

1 files changed, 7 insertions, 1 deletions

diff --git a/src/chttpd/src/chttpd_db.erl b/src/chttpd/src/chttpd_db.erl
index 8e528b5f2..312adaed4 100644
--- a/src/chttpd/src/chttpd_db.erl
+++ b/src/chttpd/src/chttpd_db.erl
@@ -919,7 +919,7 @@ db_doc_req(#httpd{method='DELETE'}=Req, Db, DocId) ->
 
 db_doc_req(#httpd{method='GET', mochi_req=MochiReq}=Req, Db, DocId) ->
     #doc_query_args{
-        rev = Rev,
+        rev = Rev0,
         open_revs = Revs,
         options = Options0,
         atts_since = AttsSince
@@ -932,6 +932,12 @@ db_doc_req(#httpd{method='GET', mochi_req=MochiReq}=Req, Db, DocId) ->
             [{atts_since, AttsSince}, attachments | Options];
         true -> Options
         end,
+        Rev = case lists:member(latest, Options) of
+          % couch_doc_open will open the winning rev despite of a rev passed
+          % https://docs.couchdb.org/en/stable/api/document/common.html?highlight=latest#get--db-docid
+          true -> nil;
+          false -> Rev0
+        end,
         Doc = couch_doc_open(Db, DocId, Rev, Options2),
         send_doc(Req, Doc, Options2);
     _ ->