say i have some lamp status monitoring records, i.e.
{ "seq": 1, "name": "a", },
{ "seq": 2, "name": "b", },
{ "seq": 2, "name": "a", "on": true},
{ "seq": 3, "name": "a", },
{ "seq": 7, "name": "a", "on": true},
...
where default state is off, and when on, there's extra bool attribute
for it. Records are sequenced (in time) by some .seq param. And there's
many other here-irrelevant attributes.
say i want a view for all lamps that the currently off.
so, something like:
map_func: function( doc) {
if (doc.type == 'lamp') emit( [doc.name, doc.seq], doc );
}
reduce_func: function( keys, values, rereduce) {
var v = values[ values.length-1];
if (v == null || v.on) return null;
return v;
}
always used with group_level= 1
but i get the very first state instead of very last state...
and in the debug-log, i see that the keys passed to reduce are reversed!
so i have to use descending=True, and only then it works correctly.
the question is, is this expected, or is the default order defined
somewhere else, or what?
ciao
svil
