Nodejs Mongo insert into subdocument - dynamic fieldname

问题

{username:'me', companies:{"yourcompany":{...}}

I want to insert a company into a user record (user collection), to make:

{username:'me', companies:{ "yourcompany":{...}, "mycompany":{...} }

But the name is dynamic..

var companyid = "mycompany";

.collection('users').findAndModify(
{username: usern}, 
[['_id', 'asc']], 
{$set:{companies:{companyid: { desksmemberships:[] }}}},    
{new: true}, function(){...}

Gives this.. {username:'me', companies:{ "yourcompany":{...}, "companyid":{...} }

How do I do this?

回答1:

You'd have to build up your $set modifier programmatically:

var modifier = { $set: {} };
modifier.$set['companies.' + companyid] = { desksmemberships:[] };

And then use modifier as the third parameter in your findAndModify call.

You may also want to consider changing companies to be an array instead of an embedded object.

Node.js 4.x Update

You can now use the computed property syntax to do this directly in the object literal:

collection('users').findAndModify(
    {username: usern}, 
    [['_id', 'asc']], 
    {$set:{['companies.' + companyid]: { desksmemberships:[] }}},    
    {new: true},
    function(){...});

回答2:

I've seen this question on quite a few posts, some of them quite complex- call me crazy but you can do this (node + mongo):

My db schema 'matches' is set to an array. In the mongo data [match.matchId] becomes '2028856183'.

db.update({key: value}, {matches: [{[match.matchId] : match}] }, callback);
db.update(what to find, what to change it to, what to do next)

You can use any variable in the brackets.

来源：https://stackoverflow.com/questions/12184626/nodejs-mongo-insert-into-subdocument-dynamic-fieldname

标签

node.js

mongodb

mongoskin