How to use Meteor.users.update to inc a variable in a case specific object?

Question

I need to inc a variable within the case specific object in an array in the profile object in the users object/mongo collection. The case specific object's name will equal a local variable, and the I want to inc the variable num by 1. What would the syntext for this look like?

Answer 1

I don't know exactly what your model looks like but here is an example that may help you.

Test=new Mongo.Collection(null);

var id=Test.insert({
  hashtags:[{
    tag:"meteor",
    count:2
  },{
    tag:"javascript",
    count:5
  }]
});

var tag="meteor";

Test.update({
  _id:id,
  "hashtags.tag":tag
},{
  $inc:{
    "hashtags.$.count":1
  }
});

console.log(Test.findOne());

In this example, we specify in the query that we're interested in updating only the array item whose tag matches our local variable, then we use mongodb $ positional operator to increase the item count property accordingly.