如何在MongoDB中以主条件联接主明细表

Question

如何为xads这个查询添加条件？ （Exp：lads.status = 1）

db.xads.aggregate([
                {
                    $lookup: {
                        from: 'xaditems',
                        localField: '_id',
                        foreignField: 'masterId',
                        as: 'xadItems'
                    },
                }
              ]);

Answer 1

db.xads.aggregate([
                {
                 $match:{"status":1} //add you filters in match
                },
                {
                    $lookup: {
                        from: 'xaditems',
                        localField: '_id',
                        foreignField: 'masterId',
                        as: 'xadItems'
                    },
                }
              ]);

Answer 2

行！谢谢DHIRAJ KATEKAR

db.xads.aggregate([
                {
                 $match:{"status":1} 
                },
                {
                    $lookup: {
                        from: 'xaditems',
                        localField: '_id',
                        foreignField: 'masterId',
                        as: 'xadItems'
                    },
                }
              ]);