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MD_Shamim_Reza1Md Shamim Reza
Jul 2024

i have a data that is

[{
    "massName": "PI",
    "month":7,
    "member":
        [ 
          {
            "name": "shamim",
            "meal": [
                
            ],
            "pyment":[
                {
                    "07-07-2024":500
                },
                {
                    "13-07-2024":500
                }
            ]

          },
          {
            "name": "imran",
            "meal": [  
            ],
            "pyment":[
                {
                    "07-07-2024":300
                },
                {
                    "13-07-2024":500
                }
            ]

          },
          {
            "name": "hasibul",
            "meal": [
            ],
            "pyment":[
                {
                    "07-07-2024":500
                },
                {
                    "13-07-2024":700
                }
            ]
          }
        ],
        "bazar":[
            {
                "name":"shamim",
                "date": "07-07-2024",
                "amount":750
            },
            {
                "name":"imran",
                "date": "07-07-2024",
                "amount":560
            }
        ]
}
]

now i want to replace meal 2.5 to 4 for the member name shamim and date 07-07-2024. i try to solve it using many way but i failed. there’s some way
1.
db.massDetails.updateOne( { "member.name": "shamim", "member.meal.07-07-2024": { $exists: true } }, { $set: { "member.$.meal.'07-07-2024'": 3 } } )
2.
db.massDetails.updateOne( { "member.name": "shamim", "member.meal.07-07-2024": { $exists: true } }, { $set: { "member.$.meal": {'07-07-2024':3}} } )
please anyone give me the solution

turivishalVishal TuriMongoDB User Group Leader
Jul 2024

Hello @MD_Shamim_Reza1, Welcome,

You have to use arrayFilters to update nested array, follow the points corrected in your query,

  • match, use $elemMatch to satisfy both conditions in the same element
  • arrayFilters, create an identifier m and check the same condition that date exists or not
  • update, use the $[m] identifier so it will match and update the value on the specific date.
db.massDetails.updateOne({
  "member": {
    "$elemMatch": {
      "name": "shamim",
      "meal.07-07-2024": { "$exists": true }
    }
  }
},
{
  "$set": {
    "member.$.meal.$[m].07-07-2024": 4
  }
},
{
  "arrayFilters": [{ "m.07-07-2024": { "$exists": true } }]
})

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