Exploring the capabilities of mongojs: Adding items to arrays within fields

Question

Exploring the capabilities of mongojs: Adding items to arrays within fields

I've been researching extensively on this subject, but I'm completely stumped. Here's my dilemma (I'm working with node.js and mongojs):

I want to create documents like the following:

{ 
    "_id" : ObjectId("50ce2f7f98fa09b20d000001"), 
    "beginTime" : 1355689855016, 
    "tags" : {
        "primary": [ 29, 12, 16], 
        "secondary": [6, 8, 9]
    },
    "user" : "50bdddc601de4681d666835f"
}

However, when I attempt to add new tags under "primary" using variables like so:

tags = {};
tags[request.body.relevance] = request.body.tag;
return db.activities.update({
  '_id': db.ObjectId(request.body.activity),
  'user': request.session.user.id
}, {
  $push: {
    tags: tags
  }
});

I end up with:

{ "_id" : ObjectId("50ce2f7f98fa09b20d000001"), "beginTime" : 1355689855016, "tags" : [ { "primary" : 29 }, { "primary" : "24" }, { "primary" : "1" } ], "user" : "50bdddc601de4681d666835f" }

I've tried numerous different approaches, even attempted nesting $push (which turned it into a field). Nothing seems to work. At this point, I'm feeling extremely frustrated.

If you have any insights or solutions, please lend me a hand. Much appreciated.

javascript mongodb mongojs

Answer 1

Answer №1

When using the $push operator, make sure that the value specified is for the array field you want to add to, and not the parent field.

Consider the following approach:

...
return db.activities.update({
  '_id': db.ObjectId(request.body.activity),
  'user': request.session.user.id
}, {
  $push: {
    'tags.primary': tags.primary,
    'tags.secondary': tags.secondary
  }
});

UPDATE

If you need to handle this dynamically, use a method like the one below:

...
var push = {};
push['tags.' + request.body.relevance] = request.body.tag;
return db.activities.update({
  '_id': db.ObjectId(request.body.activity),
  'user': request.session.user.id
}, {
  $push: push
});

Answer 2

When using the $push operator, make sure that the value specified is for the array field you want to add to, and not the parent field.

Consider the following approach:

...
return db.activities.update({
  '_id': db.ObjectId(request.body.activity),
  'user': request.session.user.id
}, {
  $push: {
    'tags.primary': tags.primary,
    'tags.secondary': tags.secondary
  }
});

UPDATE

If you need to handle this dynamically, use a method like the one below:

...
var push = {};
push['tags.' + request.body.relevance] = request.body.tag;
return db.activities.update({
  '_id': db.ObjectId(request.body.activity),
  'user': request.session.user.id
}, {
  $push: push
});

Exploring the capabilities of mongojs: Adding items to arrays within fields

Answer №1

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