Utilize Meteor and Mongo to access a nested array object in a template with spacebars

I am trying to populate the content of a textarea by extracting data from a nested array. In my helper function, I have specified the document id and the element id. The goal is to extract the content of the text field from the findOne result and display it in the template. However, I am facing difficulty in retrieving the correct field from the findOne result using the spacebar helper {{infotext}}:

Sample Document JSON

{
    "_id" : "8rmzAN3yw79TAKNeD",
    "title" : "title",
    "tooltips" : [
        {
            "element" : "16091688",
            "text" : "Lorem"
        },
        {
            "element" : "944a0d46",
            "text" : "ipsum"
        }
    ]
}

Helper Function

Template.infotext.helpers({
    infotext: function() {
        var id = '8rmzAN3yw79TAKNeD',
            elementId = Session.get('elementID');
        return Articles.findOne({_id: id, 'tooltips.element': elementId});
    }
});

Template Code

<template name="infotext">
    <form>
        <textarea>{{infotext}}</textarea>
        <input type="submit" class="btn btn-default" value="save">
    </form>
</template>
javascriptmeteor

Answer №1

Your current helper function retrieves the entire document instead of just the necessary information. It is recommended to make modifications to only fetch the required data. Please note that the following code snippet has not been tested and may require adjustments for functionality:

Template.infotext.helpers({
    infotext: function() {
        var id = '8rmzAN3yw79TAKNeD',
            elementId = Session.get('elementID');
        var doc = Articles.findOne({_id: id, 'tooltips.element': elementId});
        var text = '';
        if (doc) {
            var filtered = doc.tooltips.filter(function(tooltip) {
                if (tooltip.element == Session.get('elementID')) {
                    return tooltip;
                }
                return false;
             });
             if (filtered[0]) {
                 text = filtered[0].text; //retrieves the first matching text assuming no duplicates
             }
        }
        return text;
    }
});

Answer №2

Experiencing the same problem, thank you for sharing. I found a solution that worked for me:

 function getUserAmount(){
    let item = Items.findOne({_id: this._id, 'cart.user': Meteor.userId()});
    let amount = '';

    if(item){
        item.cart.filter(function (cart) {
            if(cart.user === Meteor.userId()){
                amount = Number(cart.amount);
            } else {
                amount = 0;
            }
         });
    } else{
        amount = 0;
    }

    return amount;
}

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