流星db.find在JSON内的日期作为选择器不起作用

Question

I read thru a lot of resources in the internet and followed a lot of examples on how to find a collection within a specific date range and it didn't work. My code is as below:-

var fromAge = 18;
var toAge = 22;
Meteor.users.find({:profile.birthday":{$lt: new Date(new Date().setYear(new Date().getFullYear() - fromAge)), $gt: new Date(new Date().setYear(new Date().getFullYear() - toAge))}).fetch();

The above query return an empty collection when I do a simple Meteor.users.find().fetch() it did returned one record below:-

{"_id": 123452345, "profile.birthday": ISODATE("1975-10-22T00:00:00Z")}

to debug, I also write the following query on both javascript console as well as backend server mongo shell and it did return empty collection as well.

Javascript Console

Meteor.users.find({"profile.birthday": {$lt: new Date()}})

Server MongoDB Shell

db.users.find{"profile.birthday": {$lt: new Date()}})

I have no clue now. It would be great if somebody can enlighten me.

-- UPDATE --

I tried the below query and it did return nothing

db.users.find({"profile.birthday":{$lt: new Date(new Date().setYear(new Date().getFullYear() - 18)).toISOString()}})

I typed in the command in javascript console

new Date(new Date().setYear(new Date().getFullYear() - 18)).toISOString()

And it did tell me

"1997-11-06T16:35:28.844Z"

And it my database, the record the birthday should be "1975-10-22T00:00:00Z" and thus it should hit this record, but all I can have is an empty collection.

Someone tells me to use ISODate(), I tried the below command it did works in MongoDB Shell, while it yields ISODate Undefined in my Meteor helper function.

db.users.find({"profile.birthday":{$lt: ISODate("1977-11-06")})

Have read thru some other resources ( Inserting and Querying Date with MongoDB and Nodejs ) and learnt that I should use Date instead of ISODate whereby ISODate is internal to MongoDB and Meteor will help to do the Date to ISODate Conversion. I then tried to hard code the query and it did works fine:-

db.users.find({"profile.birthday": {$lt: new Date("1977-11-06T00:00:00.000Z")}})

-- UPDATE BEGIN (16 Nov 2015) --

It works fine, while my problem is I tried to build the selector in json and then put it into the find while this wont work:-

selector={"profile.birthday": {$lt: new Date("1977-11-06T00:00:00:000Z"}};
db.users.find(selector);

The above query returned nothing at all.

-- UPDATE END (16 Nov 2015) --

I am doing that because I have a dropdown of age group and am trying to build the query thru a helper event. I have a dropdown template below:- /client/ageRangeDropdown.html

<template name="AgeRangeDropdown">
  <div class="btn-group">
    Age Group
    <select id="ageRangeDropdownList" class="form-control">
      <option >Whatever</option>
      <option >18-22</option>
      <option >23-27</option>
      <option >28-32</option>
      <option >33-37</option>
      <option >38-42</option>
      <option >43-47</option>
      <option >48-52</option>
      <option >53-57</option>
    </select> 
  </div>
  {{#each currentCriterias}}
    <span class="label label-info">{{criteria}}</span>
  {{/each}}
  {{#each myUser}}
    {{profile.firstName}} ,  {{profile.lastName}}, {{profile.birthday}}
  {{/each}}
</template>

And the helper below

/client/ageRangeDropdown.js

Template.ageRangeDropdown.events({
  'change ageRangeDropdownList': function(e) {
  for (var key in target) {
    if (!target.hasOwnProperty(key)) {
      if (key=='id') {
        id = target[key];
      }
    }  
  }
  var value = target.options[target.selectedIndex].value;
  if (value!='Whatever') {
    currentCriterias.push({id: "profile.birthday", criteriaValue: value});
  }
  var query = [];
  for (var i = 0; i < items.length; i++) {
    var itemObject = {};
    var fromAge = currentCriterias[i]['criteriaValue'].substr(0,2);
    var toAge = currentCriterias[i]['criteriaValue'].substr(3,2);
      itemObject['profile.birthday'] = {
        $gt: new Date(new Date().setYear(new Date().getFullYear() - fromAge)),
        $lt: new Date(new Date().setYear(new Date().getFullYear() - toAge))
      }
    query.push(itemObject);
  }
  var selector  = [];
  selector.push({$or: query});
  Template.instance().selector.set({$or: selector});

  return false;
})

Templage.ageRangeDropdown.created = function() {
  var instance = this;
  instance selector = new RactiveVar([]);

  instance.autorun(function() {
    var selector = instance.selector.get();
    if (typeof selector != 'undefined' && Object.keys(selector).length > 0) {
        var subscription = instance.subscribe('searchUser', selector);
    }
  });

  instance.myUser = function() {
    var selector = instance.selector.get();
    if (typeof selector != 'undefined' && Object.keys(selector).length > 0) {
      return Meteor.users.find(selector, {fields: {profile: 1}});
    }
  }
}

server/serverpublish.js

Meteor.publish("searchUser", function(selector){
  if (!this.userId) {
      console.log("Cannot search User when you haven't logged in.");
      return null;
  } else {
      if (typeof selector != 'undefined' || Object.keys(selector).length > 0) {
        var user=Meteor.users.find(selector, {fields: {profile: 1}});
        return user;
      } else {
        console.log("won't publish all user profiile when no selector is given");
        return null;
      }
    }
});

The logic is like that, actually I have a lot of dropdown each of which will constitute part of the query, and I setup the query using instance reactive variable so that whenever it changed, meteor will do a meteor.find again. Every dropdown works fine except this birthday which is a date. Anyone have idea what's going wrong?

Answer 1

Hint:

Try the following query format in the mongodb shell.

db.users.find( 
    {"profile.birthday":{ 
        $gte: ISODate(fromAge),
        $lt: ISODate(toAge)
    }
})

fromAge and toAge should be proper format.

Answer 2

From another forum I got an answer.

For details please refer to https://forums.meteor.com/t/meteor-db-find-with-date-inside-a-json-as-selector-not-working/12892/9

In short, I just new a Date Object in the query like that

query[DBPrefix] = {
  $lte: new Date(fromDate),
  $gte: new Date(toDate)
}