id!
this is my current practice. The problem is that the last res.send () only deals with the first traversal. If you put res.send () outside the traversal, the value of goodsList does not change. Is there a big answer?
id!
this is my current practice. The problem is that the last res.send () only deals with the first traversal. If you put res.send () outside the traversal, the value of goodsList does not change. Is there a big answer?
db.Classify.aggregation([{
$lookup:{
from: "Good",
localField: "_id",
foreignField: "classify_id",
as: "goodsList"
}
}]) nested queries
mongo support aggregation
later discovered that async.mapSeries can aggregate the results of multiple tasks 
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