Retrieving information from two MongoDB collections (with filtering on _id) within a Meteor application

I've been facing an issue with my Meteor application for quite some time now. I'm creating a platform where users can sign up for groups, upload images, and assign specific tags to their images. The Tags collection holds unique identifiers (_id) and names for each tag.

In the Group collection, each entry contains an array of _ids corresponding to available tags that users can select for their images.

Single Entry in Groups Collection

{ 
"_id" : "uC3PRu3qdcAF2tKK8", 
"name" : "Summer Festival 2017", 
"token" : "SummerFunUnited", 
"tags" : [ "c6vMNnfJzFjEqDSJv", "RYNSsvmafCdRZ6Me9", "9qJD5L6PYCEcbEKcb" ]
 }

The tags in the Tags collection are stored as follows:

Mongo Tags Collection

{ "_id" : "c6vMNnfJzFjEqDSJv", "name" : "Summerfanatic" }
{ "_id" : "RYNSsvmafCdRZ6Me9", "name" : "Sunshineaddict" }
{ "_id" : "9qJD5L6PYCEcbEKcb", "name" : "Danceman" }

I'm trying to create an Admin Panel where administrators can see which tags are being used in a specific group. While the route is functioning properly and I'm able to retrieve the group name in my template, I'm struggling to display the names of the tags associated with the group. My MongoDB queries are not yielding any results, and I believe I may be doing something incorrectly.

When using a query like:

Groups.find({ tags: { $in: [ "c6vMNnfJzFjEqDSJv", "RYNSsvmafCdRZ6Me9", "9qJD5L6PYCEcbEKcb" ] }})

I am not getting any results back.

I would greatly appreciate your help or suggestions on how to store tags more effectively (considering the need for administrators to add new tags in the future).

Kind Regards!

javascriptmongodbmeteormongodb-querymeteor-blaze

Answer №1

Your question is looking for the following information:

"locate Group documents that have at least one Tag ID in their 'tags' field from a provided array".

This will help you identify Groups connected to specific Tags.

You are also interested in displaying Tags (by name) associated with a particular Group.

To achieve this, you can use a simple query once you have the necessary Group document data:

"find Tag documents with an '_id' field within the specified array"

Then, use your Blaze template to iterate through these Tags and showcase their names.

Here is an example:

Spacebars

{{#each groupDoc in groupDocs}}
    {{> groupTemplate groupDoc1=groupDoc}}
{{/each}}

<template name="groupTemplate">
    {{#each tagDoc in tagsDocs groupDoc1}}
        {{tagDoc.name}}
    {{/each}}
</template>

JavaScript

Template.groupTemplate.helpers({
    tagsDocs: function (groupDoc) {
        var tagsIdArray = groupDoc.tags;

        return Tags.find({
            _id: {
                $in: tagsIdArray
            }
        });
    }
});

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