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How to find and update a mongoose model?

I have a model userDatas and it contain a list of user data.

[{
    "_id" : ObjectId("5bb6730721f28a295436b36f"),
    "userId" : "5bb6730721f28a295436b36e",
    "reputationNumber" : 0,
    "questions" : [],
    "answers" : []
},
{
    "_id" : ObjectId("5bb6738c21f28a295436b371"),
    "userId" : "5bb6738c21f28a295436b370",
    "reputationNumber" : 0,
    "questions" : [],
    "answers" : []
}]

I want to filter by userId and add "5bb7d72af050ca0910282ff4" string to questions array. How to accomplish that?

//Userdatas.find
Solution

  • Since you are using mongoose you can use the findOneAndUpdate and addToSet to achieve this:

    Userdatas.findOneAndUpdate(
   {userId: "5bb7d72af050ca0910282ff4"}, 
   {$addToSet: {questions: '5bb7d72af050ca0910282ff4'}}, 
   function (err, result) {
     ...
   }
)