Make dynamic query with Mongoose

问题:

I am trying to make a dynamic condition using Mongoose but it doesn't work as I imagined.

the code is like this

id = req.params.questionId;
index = req.params.index;

callback = function(err,value){
   if(err){

       res.send(err)

   }else{

       res.send(value)

    }
};

conditions = {
    "_id": id,
    "array._id": filterId
};
updates = {
   $push: {
      "array.$.array2."+index+".answeredBy": userId
   }
};
options = {
  upsert: true
};

Model.update(conditions, updates, options, callback);

As you see, I am trying to make dynamic condition using "index" variable. Is it possible to do like this?

Thank you in advance!

回答1:

You need to create your updates object in two steps:

var updates = { $push: {} };
updates.$push["array.$.array2." + index + ".answeredBy"] = userId;

Update

Now that node.js 4+ supports computed property names, you can do this in one step:

var updates = { $push: {
    ["array.$.array2." + index + ".answeredBy"]: userId
} };