MongoDB聚合方法

比如说

如何显示db.anycollection.aggregate（..）的结果

您可以这样做：-

var Member = mongoose.model("Members", memberSchema );

Member.aggregate(
{ "$match": { "_id": userid } },
{ "$unwind": "$friends" },
{ "$match": { "friends.status": 0 } },
function( err, data ) {

if ( err )
  throw err;

console.log( JSON.stringify( data, undefined, 2 ) );

}

通过这样做，您可以显示聚合结果

var Member = mongoose.model("Members", memberSchema );

Member.aggregate(
{ "$match": { "_id": userid } },
{ "$unwind": "$friends" },
{ "$match": { "friends.status": 0 } },
function( err, data ) {

if ( err )
  throw err;

console.log( JSON.stringify( data, undefined, 2 ) );

}