Removing item from array not working

I'm trying to remove a tag from an array. But I can't get it to work – nothing happens. The console.log output seems to be correct. Thanks!

The event handler

Template.doc.events({
    'click .remove': function(event, template) {
        console.log("This doc's _id: " + template.data._id);
        console.log("doc's tags: " + template.data.metadata.tags);

        var thisTag = this;
        console.log("thisTag: " + thisTag);

        MyPix.update (
            template.data._id,
            { $pull: { 'template.data.metadata.tags': thisTag }},
            { multi: true }
        );
    },
});

The Template

<template name="doc">
    <ol><li>
        <span class="property">metadata.tags</span>: 
        {{#each this.metadata.tags}}
            <span class="tag"><span class="remove">X</  span>{{this}}</span>
        {{/each}}
    </li></ol>
</template>