Accessing Parent Data in a Meteor Template Helper - mongodb

Question

I have a template for a collection of Groups. Each group document contains an array with each element containing a number and a boolean. The template is laid out as follows:
<template name="group">
<li class="{{#if checked}}checked{{/if}} groupBox">
<button class="delete">×</button>
<input type="checkbox" checked="{{checked}}" class="toggle-checked-group" />
<span class="text">{{name}}</span>
<ul>
{{#each this.numbers}}
<li class="checked">
<button class="deleteNumber">×</button>
<input type="checkbox" checked="{{checked}}" class="toggle-checked-number" />
<span class="text">{{number}}</span>
</li>
{{/each}}
</ul>
<form class="new-number">
<input type="text" name="number" placeholder="Type to add a number to this group" />
</form>
</li>
</template>
An example group document is laid out as such:
{
"_id": "pSpNcJKDPhRtGhtov",
"name": "Sample Group",
"createdAt": "2015-06-27T00:45:39.137Z",
"owner": "t2ELweZsZqJXNQqdZ",
"username": "brodan",
"checked": false,
"numbers": [
{
"number": "1234567",
"checked": true
}
]
}
I need to be able to remove a specific number from the numbers array when I click on the deleteNumber button. I have the following javascript and can't figure out how to get the parent context to use in the MongoDB query:
Template.group.events({
"click .deleteNumber": function () {
Meteor.call("deleteNumber");
}
});
Meteor.methods({
deleteNumber: function (numbers) {
//Need to delete number from group via MongoDB query here.
}
});
I know that I can use the $pull operator in my MongoDB query in the deleteNumber method, but in order to get the right group, I need to have the parent data from the number in the template.
Solved thanks to xamfoo's answer.
The working deleteNumber method is now set up like this:
deleteNumber: function (groupId, number) {
Groups.update(groupId, {$pull: {numbers: {"number": number}}});
}

Answer 1

You should be able to get the context via this in the event handler and group data with Template.instance().data:
Template.group.events({
"click .deleteNumber": function () {
var data = Template.instance().data;
Meteor.call("deleteNumber", data._id, this.number);
}
});
In this case, parameters of deleteNumber are:
Meteor.methods({
deleteNumber: function (groupId, number) {
//Need to delete number from group via MongoDB query here.
}
});
You can also access the data context with Template.currentData() or Template.parentData().