Save a value in Collections and find it with Meteor

Question

Values = new Meteor.Collection("values");

if (Meteor.isServer) {
  Meteor.startup(function () {
    Meteor.setInterval(function() {
      Values.insert({id: Math.random(), name: "value"});
      console.log(Values.find({name: "value"}).id);
    }, 1000);
  });
}

I have that code and I'm trying to add a value to Values every second and find all the values I have and print them every second. However, it is not finding the values I add and is outputting:

I2043-14:21:56.895(0)? undefined

score 1 · Accepted Answer · answered Nov 19 '13 at 14:40

1

find returns a cursor, which is an object that contains the results of your search (somewhat like an array of results). It does it this way since find can get more than just one result, depending on the selector you passed.

It has a forEach similar to JS that accepts a function and receives the document, the index, and the cursor as parameters.

Values.find({name: "value"}).forEach(function(doc,index,cursor){
  console.log(doc.id);
});

Visually, a result of find in your case looks something like:

[
  {id: SOME_RANDOM_NUMBER, name: "value"},
  {id: SOME_RANDOM_NUMBER, name: "value"},
  {id: SOME_RANDOM_NUMBER, name: "value"},
  {id: SOME_RANDOM_NUMBER, name: "value"},
]

answered Nov 19 '13 at 14:40

Joseph

117,725
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Any idea how I can get the length of a Collection, i. e., how many elements are in a collection? I tried `Values.find({name: "value"}).length` based on what you tell me the result of `find` in my case is, but I'm getting `undefined`. – David Gomes Nov 19 '13 at 16:19
I also tried `Values.find().count()` but it returns 426 every time :o – David Gomes Nov 19 '13 at 16:45
@user996056 `Values.find({}).count()` to return the length of the collection. – Joseph Nov 19 '13 at 16:46
That is also returning 426 on a most definitely empty collection. Full code here: https://gist.github.com/davidgomes/464b592f4f4bed809c1b – David Gomes Nov 19 '13 at 17:55
You need to use `Values.remove(doc._id)` to remove the documents. – sbking Nov 19 '13 at 19:24
Yes, but which documents? I didn't add any. – David Gomes Nov 19 '13 at 22:00

Save a value in Collections and find it with Meteor

1 Answers1