{
"_id" : 3,
"repos" : {
"com" : [
{ "a" : 16555, "t" : 141, "d" : 7633 } ,
{ "a" : 14358, "t" : 121, "d" : 7133 } ,
{ "a" : 12356, "t" : 108, "d" : 2137 } ,
],
"self" : [
{
"forks_count" : 54,
"id" : 7370053,
"rank_score" : 0.0006762191350350863
},
{
"forks_count" : 54,
"id" : 7370053,
"rank_score" : 0.0006762191350350863
}]
}
}
如何求self中陣列檔案的個數?
各路大神指導
uj5u.com熱心網友回復:
$size 命令uj5u.com熱心網友回復:
樓主:1樓正解
db.collection.aggregate([{$project:{_id:1,cnt:{$size:'$陣列欄位'}}}])
轉載請註明出處,本文鏈接:https://www.uj5u.com/shujuku/84089.html
標籤:MongoDB
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