How to return the given input values not available in array using mongodb query

user_10720615 0
Viewed 29

I am having one input arrays,EX: let UPID = ["0","1","10"]. i have to check members.regularStudent whether given input values available or not ?, suppose not available means i have to push one array and return the results

My documents:

{
    "_id" : "5bb20d7556db6915846da67f",
    "members" : {
        "regularStudent" : [
            "3",
            "4"
        ]
    }
},

{
    "_id" : "5bb20d7556db6915846da55f",
    "members" : {
        "regularStudent" : [
            "1",
            "2"
        ]
    }
}

My Expected Output

    [
        "0",
        "10"
    ]

My Code:

    let UPID = ["0","1","10"]
db.Groups.find(
    /*{
    "members.regularStudent": { $nin: UPIDs }
    }*/
)
.forEach(function(objects){
    print(objects)
})

I had updated mycode, kindly see top on my question section, print(objects) means i am having the my objects, based on this variable can you update your answer,

** print(objects) ** 

{
    "_id" : "5bb20d7556db6915846da67f",
    "members" : {
        "regularStudent" : [
            "3",
            "4"
        ]
    }
},

{
    "_id" : "5bb20d7556db6915846da55f",
    "members" : {
        "regularStudent" : [
            "1",
            "2"
        ]
    }
}
mongodb-query mongodb javascript
2 Answers

You could use map method in combination with filter.

let UPID = ["0","1","10"]; 
let docs = [{ "_id" : "5bb20d7556db6915846da67f", "members" : { "regularStudent" : [ "3", "4" ] } },
{ "_id" : "5bb20d7556db6915846da55f", "members" : { "regularStudent" : [ "1", "2" ] } }]

let ids = [].concat(...docs.map(elem => elem.members.regularStudent));
console.log(UPID.filter(id => !ids.includes(id)));

user_65831400

Here I use forEach to iterate through the data to get all of the regularStudent data into one array then use filter to filter out the data from UPID array.

const UPID = ["0", "1" , "10"]
let data = [
  {
      "_id" : "5bb20d7556db6915846da67f",
      "members" : {
          "regularStudent" : [
              "3",
              "4"
          ]
      }
  },
  {
      "_id" : "5bb20d7556db6915846da55f",
      "members" : {
          "regularStudent" : [
              "1",
              "2"
          ]
      }
  }
]
let resularStudents = []
data.forEach(d => {
  d.members.regularStudent.forEach(rs => {
    resularStudents.push(rs)
  })
})
var result = UPID.filter(
    function(d) {
      return this.indexOf(d) < 0;
    },
    resularStudents
);
console.log(result);

user_37013930
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