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proper score aggregation #1562

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barisusakli
2014-05-23 17:03:53 -04:00
parent 5e51895982
commit b7fcde446b
1 changed files with 23 additions and 16 deletions
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39
src/database/mongo/sorted.js
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@@ -163,28 +163,35 @@ module.exports = function(db, module) {
stop = -1; stop = -1;
} }
var limit = stop - start + 1; var limit = stop - start + 1;
if (limit < 0) { if (limit <= 0) {
limit = 0; limit = 0;
} }
db.collection('objects').find({_key:{$in: sets}}, {fields: {_id: 0, value: 1, score: 1}}) var pipeline = [
.limit(limit) { $match: { _key: {$in: sets}} },
.skip(start) { $group: { _id: {value: '$value'}, totalScore: {$sum : "$score"}} },
.sort({score: sort}) { $sort: { totalScore: sort} }
.toArray(function(err, data) { ];
if (err || !data) {
return callback(err);
}
data = data.map(function(item) { if (start) {
return item.value; pipeline.push({ $skip: start });
}); }
data = data.filter(function(value, index, array) { if (limit > 0) {
return array.indexOf(value) === index; pipeline.push({ $limit: limit });
}); }
callback(null, data); pipeline.push({ $project: { _id: 0, value: '$_id.value' }});
db.collection('objects').aggregate(pipeline, function(err, data) {
if (err || !data) {
return callback(err);
}
data = data.map(function(item) {
return item.value;
}); });
callback(null, data);
});
} }
}; };